Language
Rust archive
The subset of the library that currently has Rust code or a Rust solution link.
812 entries
This is the Rust-first slice of the archive, useful when you want the multilingual subset only.
14.05.2026
easy2784. Check if Array is Good
Is combination 1..n,n
13.05.2026
medium1674. Minimum Moves to Make Array Complementary
Min changes 1..L to make complementary pair sum equal
12.05.2026
hard1665. Minimum Initial Energy to Finish Tasks
Energy for all tasks (spend, limit)
11.05.2026
easy2553. Separate the Digits in an Array
LIst of numbers to list of digits
10.05.2026
medium2770. Maximum Number of Jumps to Reach the Last Index
Max steps to reach end by jumps n[j]-n[i] in -t..t
09.05.2026
medium1914. Cyclically Rotating a Grid
Rotate matix layers by k
08.05.2026
medium3629. Minimum Jumps to Reach End via Prime Teleportation
Shortest path by prime factors
07.05.2026
medium3660. Jump Game IX
Max on path jumping left-up and right-down
06.05.2026
medium1861. Rotating the Box
Rotate and simulate gravity in matrix
05.05.2026
medium61. Rotate List
Rotate linked list k steps
04.05.2026
medium48. Rotate Image
Rotate square matrix
03.05.2026
easy796. Rotate String
Match strings after rotation
02.05.2026
medium788. Rotated Digits
Count numbers in 0..n with mirrored digits 2-5 6-9, 0,1,8, but not 3,4,7
01.05.2026
medium396. Rotate Function
Max rolling hash
30.04.2026
medium3742. Maximum Path Score in a Grid
Max right-bottom path value with at most k cost
29.04.2026
hard3225. Maximum Score From Grid Operations
Max sum adjacent to marked columns
28.04.2026
medium2033. Minimum Operations to Make a Uni-Value Grid
Min ops to make all numbers equal by +-X
27.04.2026
medium1391. Check if There is a Valid Path in a Grid
Path 0 to end on type-cells 2D grid
26.04.2026
medium1559. Detect Cycles in 2D Grid
Check cycle in 2D grid
25.04.2026
hard3464. Maximize the Distance Between Points on a Square
Max of minimum distnace between selected k points on square perimeter
24.04.2026
easy2833. Furthest Point From Origin
Max dist when replace with L or R
23.04.2026
medium2615. Sum of Distances
Sum of distances to each occurance
22.04.2026
medium2452. Words Within Two Edits of Dictionary
Words in dictionary with 2 edits
21.04.2026
medium1722. Minimize Hamming Distance After Swap Operations
Diff src vs target after rearrange by rules
20.04.2026
easy2078. Two Furthest Houses With Different Colors
Max distance between different numbers
19.04.2026
medium1855. Maximum Distance Between a Pair of Values
Max distance a[i] not greater than b[j] window
18.04.2026
easy3783. Mirror Distance of an Integer
Diff with reversal
17.04.2026
medium3761. Minimum Absolute Distance Between Mirror Pairs
Distance to prev mirror number
16.04.2026
medium3488. Closest Equal Element Queries
Shortest distances to the same values
15.04.2026
easy2515. Shortest Distance to Target String in a Circular Array
Distance to target
14.04.2026
hard2463. Minimum Total Distance Traveled
Shortest distances to travel robots to factories
13.04.2026
easy1848. Minimum Distance to the Target Element
Distance to target from start
12.04.2026
hard1320. Minimum Distance to Type a Word Using Two Fingers
Min travel on keyboard to type a word
11.04.2026
medium3741. Minimum Distance Between Three Equal Elements II
Min sum of distances between i,j,k of the same values
10.04.2026
easy3740. Minimum Distance Between Three Equal Elements I
Min sum of distances between i,j,k of the same values
09.04.2026
hard3655. XOR After Range Multiplication Queries II
Run stepped multiplication queries
08.04.2026
medium3653. XOR After Range Multiplication Queries I
Run queries
07.04.2026
medium2069. Walking Robot Simulation II
Implement perimeter-robot
06.04.2026
medium874. Walking Robot Simulation
Farthest robot movement
05.04.2026
easy657. Robot Return to Origin
R,L,U,D return to 0 in XY plane
04.04.2026
medium2075. Decode the Slanted Ciphertext
Decode row-encoded string
02.04.2026
medium3418. Maximum Amount of Money Robot Can Earn
Max sum path, 2 skips allowed
01.04.2026
hard2751. Robot Collisions
Collide LR robots
31.03.2026
hard3474. Lexicographically Smallest Generated String
String from pattern matches
30.03.2026
medium2840. Check if Strings Can be Made Equal With Operations II
Strings equal at odd-even positions
29.03.2026
easy2839. Check if Strings Can be Made Equal With Operations I
Match a and b at (0|2,1|3) positions
28.03.2026
hard2573. Find the String with LCP
Build string from longest common prefixes matrix
27.03.2026
easy2946. Matrix Similarity After Cyclic Shifts
Shift rows k times left and right
26.03.2026
hard3548. Equal Sum Grid Partition II
Cut matrix in half sums, can remove one cell
25.03.2026
medium3546. Equal Sum Grid Partition I
Split matrix to equal sums
24.03.2026
medium2906. Construct Product Matrix
Product of other cells in a matrix
23.03.2026
medium1594. Maximum Non Negative Product in a Matrix
Max product path right-down
22.03.2026
easy1886. Determine Whether Matrix Can Be Obtained By Rotation
Rotate matrix
21.03.2026
medium3643. Flip Square Submatrix Vertically
Reverse submatrix k by k
20.03.2026
medium3567. Minimum Absolute Difference in Sliding Submatrix
Mid diffs in k k submatrices
19.03.2026
medium3212. Count Submatrices With Equal Frequency of X and Y
Count prefix freq X == freq Y
18.03.2026
medium3070. Count Submatrices with Top-Left Element and Sum Less Than k
Count prefix sums less than K
17.03.2026
medium1727. Largest Submatrix With Rearrangements
Max area of binary matrix, swap columns
16.03.2026
medium1878. Get Biggest Three Rhombus Sums in a Grid
Top 3 rhombus sums
15.03.2026
hard1622. Fancy Sequence
Design: add number, mulriply all, add all
14.03.2026
medium1415. The k-th Lexicographical String of All Happy Strings of Length n
K-th generated abc non-repeating string
13.03.2026
medium3296. Minimum Number of Seconds to Make Mountain Height Zero
Min steps to work a mountain with arithmetic-sum-workers
12.03.2026
hard3600. Maximize Spanning Tree Stability with Upgrades
Max of min values in span tree of graph, 2 s at most k
11.03.2026
easy1009. Complement of Base 10 Integer
Invert binary
10.03.2026
hard3130. Find All Possible Stable Binary Arrays II
array to make with z zeros, o ones, l repeats
08.03.2026
medium1980. Find Unique Binary String
Uniq bits not in a set
07.03.2026
medium1888. Minimum Number of Flips to Make the Binary String Alternating
Min flips to make 01 alterating string sum window
06.03.2026
easy1784. Check if Binary String Has at Most One Segment of Ones
+0 pattern
05.03.2026
easy1758. Minimum Changes To Make Alternating Binary String
Min flips to make bits alterating
04.08.2026
easy1582. Special Positions in a Binary Matrix
Count single 1-row-column
03.03.2026
medium1545. Find Kth Bit in Nth Binary String
Kth bit in s=s+1+inv(rev(s)) sequence
02.03.2026
medium1536. Minimum Swaps to Arrange a Binary Grid
Min rows swaps to zero above diagonal
01.03.2026
medium1689. Partitioning Into Minimum Number Of Deci-Binary Numbers
Min 01-strings add up to target
28.02.2026
medium1680. Concatenation of Consecutive Binary Numbers
Concat binaries 1..n
26.02.2026
medium1404. Number of Steps to Reduce a Number in Binary Representation to One
Ops /2+1 to make 1
25.02.2026
easy1356. Sort Integers by The Number of 1 Bits
Sort
24.02.2026
easy1022. Sum of Root To Leaf Binary Numbers
Sum of a binary numbers in a binary tree
23.02.2026
medium1461. Check If a String Contains All Binary Codes of Size K
All numbers as substring length of k window
22.02.2026
easy868. Binary Gap
Distance between onces in a binary
21.02.2026
easy762. Prime Number of Set Bits in Binary Representation
Number in l..r with prime bits count
19.02.2026
easy696. Count Binary Substrings
Count substrings of 01 and 10 window
18.02.2026
easy693. Binary Number with Alternating Bits
Alternating bits
17.02.2026
easy401. Binary Watch
All times with count bits set
16.02.2026
easy190. Reverse Bits
Reverse bits
15.02.2026
easy67. Add Binary
Binary strings sum
14.02.2026
medium799. Champagne Tower
Flow in a Pascal's Triangle
13.02.2026
medium3714. Longest Balanced Substring II
Largest equal frequencies substring of abc-string
12.02.2026
medium3713. Longest Balanced Substring I
Max substring with equal frequencies window
11.02.2026
hard3721. Longest Balanced Subarray II
Max subarray evens count = odds count tree
10.02.2026
medium3719. Longest Balanced Subarray I
Longes even=odd subarray
09.02.2026
medium1382. Balance a Binary Search Tree
Balance binary search tree
08.02.2026
easy110. Balanced Binary Tree
Is tree balanced?
07.02.2026
medium1653. Minimum Deletions to Make String Balanced
Min removal to balance 'ab'
06.02.2026
medium3634. Minimum Removals to Balance Array
Min removals to make min k not less than max window
05.02.2026
easy3379. Transformed Array
Shuffled list i+n[i]
03.02.2026
easy3637. Trionic Array I
Validate inc,dec,inc sequency
01.02.2026
easy3010. Divide an Array Into Subarrays With Minimum Cost I
Split on 2 min values
31.01.2026
easy744. Find Smallest Letter Greater Than Target
Larger letter in array
29.01.2026
medium2976. Minimum Cost to Convert String I
Min cost to convert string
28.01.2026
hard3651. Minimum Cost Path with Teleportations
Min cost to walk 2D grid with free teleports
27.01.2026
medium3650. Minimum Cost Path with Edge Reversals
Min path in weighted graph with reverse 2w nodes
26.01.2026
easy1200. Minimum Absolute Difference
Min diff pairs
25.01.2026
easy1984. Minimum Difference Between Highest and Lowest of K Scores
Min k-diff window
24.01.2026
medium1877. Minimize Maximum Pair Sum in Array
Min max pair
22.01.2026
easy3507. Minimum Pair Removal to Sort Array I
Sort by removing lowest sum pairs
21.01.2026
medium3315. Construct the Minimum Bitwise Array II
Reverse operation x or (x+1)
20.01.2026
easy3314. Construct the Minimum Bitwise Array I
Reverse x | (x+1) operation on prime numbers
19.01.2025
medium1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
Max square with sum less than threshold
18.01.2026
medium1895. Largest Magic Square
Max magic square
17.01.2026
medium3047. Find the Largest Area of Square Inside Two Rectangles
Max square in intersection
16.01.2026
medium2975. Maximum Square Area by Removing Fences From a Field
Max square after remove vertical or horizontal bars
15.01.2026
medium2943. Maximize Area of Square Hole in Grid
Max square area after removing bars in a grid
14.01.2026
hard3454. Separate Squares II
Min y to equal split areas exclude intersections sweep
13.01.2026
medium3453. Separate Squares I
Min Y to split into equal areas
12.01.2026
easy1266. Minimum Time Visiting All Points
Euclid travel distance
11.01.2026
hard85. Maximal Rectangle
Max all-1 rectangle in 2D matrix stack
10.01.2026
medium712. Minimum ASCII Delete Sum for Two Strings
Min removed sum to make strings equal
09.01.2026
medium865. Smallest Subtree with all the Deepest Nodes
Lowest common ancestor of the deepest nodes
08.01.2026
hard1458. Max Dot Product of Two Subsequences
Max product of 2 subsequencies
07.01.2026
medium1339. Maximum Product of Splitted Binary Tree
Max sumA sumB of a tree split
06.01.2026
medium1161. Maximum Level Sum of a Binary Tree
Min level max sum in tree
05.01.2026
medium1975. Maximum Matrix Sum
Max sum after multiply -1 adjacent cells
04.12.2025
medium1390. Four Divisors
Sum of exactly four-divisors of each number
03.12.2026
hard1411. Number of Ways to Paint N × 3 Grid
Ways to color 3xN grid
02.01.2026
easy961. N-Repeated Element in Size 2N Array
Duplicate majority element
01.01.2026
easy66. Plus One
Increment big number
31.12.2025
hard1970. Last Day Where You Can Still Cross
Last day top connected to bottom in 2D matrix
30.12.2025
medium840. Magic Squares In Grid
Count 'magic' 3x3 squares
29.12.2025
medium756. Pyramid Transition Matrix
Can build a pyramid from transitions?
28.12.2025
easy1351. Count Negative Numbers in a Sorted Matrix
Count negatives in 2D sorted matrix
27.12.2025
hard2402. Meeting Rooms III
Most frequent room 0..n for meetings [s,e]
26.12.2025
medium2483. Minimum Penalty for a Shop
Min close time by customers max volune
25.12.2025
medium3075. Maximize Happiness of Selected Children
K max values, decreas each pick
24.12.2025
easy3074. Apple Redistribution into Boxes
Min containers for all apples sort
23.12.2025
medium2054. Two Best Non-Overlapping Events
Max at most two non-overlapping events max
22.12.2025
hard960. Delete Columns to Make Sorted III
Remove columns to sort strings
21.12.2025
medium955. Delete Columns to Make Sorted II
Remove columns to sort strings
20.12.2025
easy944. Delete Columns to Make Sorted
Count unsorted columns
19.12.2025
hard2092. Find All People With Secret
Time based secret spread in a graph
18.12.2025
medium3652. Best Time to Buy and Sell Stock using Strategy
Max Profit by modifying a sliding window sum
17.12.2025
medium3573. Best Time to Buy and Sell Stock V
K best deals buy/short/sell stocks
15.12.2025
medium2110. Number of Smooth Descent Periods of a Stock
Decreasing subarrays
14.12.2025
hard2147. Number of Ways to Divide a Long Corridor
Ways to split pairs of S
13.12.2025
easy3606. Coupon Code Validator
Filter a,b,c accroding to rules
12.12.2025
medium3433. Count Mentions Per User
Count messages and track online users
11.12.2025
medium3531. Count Covered Buildings
Count surrounded dots on XY plane
10.12.2025
medium3577. Count the Number of Computer Unlocking Permutations
Permutations to unlock all c[j] right and bigger than c[i]
09.12.2025
medium3583. Count Special Triplets
Count a[i]==a[j] 2==a[k] sum
08.12.2025
easy1925. Count Square Sum Triples
Count a^2+b^2=c^2 in 1..n range
07.12.2025
easy1523. Count Odd Numbers in an Interval Range
Odds l..h
06.12.2025
medium3578. Count Partitions With Max-Min Difference at Most K
Ways to partition into parts (max-min) at most k queue
05.12.2025
easy3432. Count Partitions with Even Sum Difference
Count Left sum - Right sum % 2
04.12.2025
medium2211. Count Collisions on a Road
Collisions R vs L
02.12.2025
medium3623. Count Number of Trapezoids I
Trapezoids count
01.12.2025
hard2141. Maximum Running Time of N Computers
Max time to run n computers with batteries
30.11.2025
medium1590. Make Sum Divisible by P
Min removal to make sum%p
29.11.2025
easy3512. Minimum Operations to Make Array Sum Divisible by K
Sum % k
28.11.2025
hard2872. Maximum Number of K-Divisible Components
Max cuts where every subtree sum %k
27.11.2025
medium3381. Maximum Subarray Sum With Length Divisible by K
Max sum of %k-length subarray
26.11.2025
hard2435. Paths in Matrix Whose Sum Is Divisible by K
Paths in 2D matrix %k
25.11.2025
medium1015. Smallest Integer Divisible by K
Smallest number 11..1 % k
24.11.2025
easy1018. Binary Prefix Divisible By 5
Prefixes divisible by 5
23.10.2025
medium1262. Greatest Sum Divisible by Three
Max sum that %3
22.11.2025
easy3190. Find Minimum Operations to Make All Elements Divisible by Three
Min steps inc/dec to make %3
21.11.2025
medium1930. Unique Length-3 Palindromic Subsequences
palindroms subsequences
20.11.2025
hard757. Set Intersection Size At Least Two
Min set each interval have two values in it
19.11.2025
easy2154. Keep Multiplying Found Values by Two
First original=original 2 not in array
18.11.2025
easy717. 1-bit and 2-bit Characters
Is '0' last from characters '0','10','11' concatenation
17.11.2025
easy1437. Check If All 1's Are at Least Length K Places Away
All ones k-distant
16.11.2025
medium1513. Number of Substrings With Only 1s
Substrings of ones
15.11.2025
medium3234. Count the Number of Substrings With Dominant Ones
Subarray zeros^2 less than ones window
14.11.2025
medium2536. Increment Submatrices by One
Increase matrix by query of rectangles of ones
13.11.2025
medium3228. Maximum Number of Operations to Move Ones to the End
Max steps to move all ones to the right
12.11.2025
medium2654. Minimum Number of Operations to Make All Array Elements Equal to 1
Min steps to make all '1' by gcd
11.11.2025
medium474. Ones and Zeroes
Longest subsequence (ones,zeros) at most (m,n)
10.11.2025
medium3542. Minimum Operations to Convert All Elements to Zero
Min ops to zeros by making min of subarrays 0 stack
09.11.2025
easy2169. Count Operations to Obtain Zero
Count numbers subtractions until 0
08.11.2025
hard1611. Minimum One Bit Operations to Make Integers Zero
Min steps to make zero by xor 1 or xor rightmost+1
06.11.2025
medium3607. Power Grid Maintenance
Smallest in subgraph after turning some nodes off
04.11.2025
easy3318. Find X-Sum of All K-Long Subarrays I
Sums of x most frequent from k-windows
03.11.2025
medium1578. Minimum Time to Make Rope Colorful
Min weighted removals to dedup
02.11.2025
medium2257. Count Unguarded Cells in the Grid
Count unseen cells by rays from guards
01.11.2025
medium3217. Delete Nodes From Linked List Present in Array
Remove an array from linked list
31.10.2025
easy3289. The Two Sneaky Numbers of Digitville
Two extra numbers from 0..n
30.10.2025
hard1526. Minimum Number of Increments on Subarrays to Form a Target Array
Min +1 range increases to make target from zeros
29.10.2025
easyWith All Set Bits
Next all bits set number
28.10.2025
easy3354. Make Array Elements Equal to Zero
Places & directions that lead the simulation to all zeros
27.10.2025
medium2125. Number of Laser Beams in a Bank
Count multiplications between rows
26.10.2025
medium2043. Simple Bank System
Design a bank
25.10.2025
easy1716. Calculate Money in Leetcode Bank
Add increasing sum of money, drop weekly gain on mondays
24.10.2025
medium2048. Next Greater Numerically Balanced Number
First bigger number freq[digit]=digit
23.10.2025
easy3461. Check If Digits Are Equal in String After Operations I
Fold each pair to (a+b)%10 until 2 left
22.10.2025
hard3347. Maximum Frequency of an Element After Performing Operations II
Max frequency after changing +k..-k ops elements window
20.10.2025
easy2011. Final Value of Variable After Performing Operations
do ++ or -- operation from 0
19.10.2025
medium1625. Lexicographically Smallest String After Applying Operations
Min string after shifting by b and rotating odd indice by a
18.10.2025
medium3397. Maximum Number of Distinct Elements After Operations
Distincts count after adding -k..k to each
16.10.2025
medium2598. Smallest Missing Non-negative Integer After Operations
First positive number can't be build by adding/subtracting value
15.10.2025
medium3350. Adjacent Increasing Subarrays Detection II
Max k of adjucent increasing k-windows
14.10.2025
medium3349. Adjacent Increasing Subarrays Detection I
Any increasing consequent windows size k
13.10.2025
medium2273. Find Resultant Array After Removing Anagrams
Dedup anagrams
12.10.2025
medium3539. Find Sum of Array Product of Magical Sequences
Product of all good subsequences and permutations
11.10.2025
medium3186. Maximum Total Damage With Spell Casting
Max sum of choosen values, skip v[i]+1+2-1-2
10.10.2025
medium3147. Taking Maximum Energy From the Mystic Dungeon
Max k-distant suffix sum
09.10.2025
medium3494. Find the Minimum Amount of Time to Brew Potions
Min total time to finish all skills[i] mana[j], non-intersecting
08.10.2025
medium2300. Successful Pairs of Spells and Potions
Number of potions spells[i] bigger than success
07.10.2025
medium1488. Avoid Flood in The City
Replace zeros with numbers to avoid duplicates search
06.10.2025
hard778. Swim in Rising Water
Min time to swim to end, flooding every second
05.10.2025
medium417. Pacific Atlantic Water Flow
Cells travel to TL&BR in decrease order
04.10.2025
medium11. Container With Most Water
Max water container from two heights
03.10.2025
hard407. Trapping Rain Water II
Fill water in 3D
02.10.2025
medium3100. Water Bottles II
Total drinks with growing exchange rate empty for full
01.10.2025
easy1518. Water Bottles
Total drinks with exchange empty for full
30.09.2025
medium2221. Find Triangular Sum of an Array
Triangle sum % 10
29.09.2025
medium1039. Minimum Score Triangulation of Polygon
Min sum of triangle product for every possible triangulation
28.09.2025
easy976. Largest Perimeter Triangle
Max triangle perimeter from array of lengths window
27.09.2025
easy812. Largest Triangle Area
Max area triangle
26.09.2025
medium611. Valid Triangle Number
Count triangles can be made from numbers search sum
25.09.2025
medium120. Triangle
Min path sum in triangle
24.09.2025
medium166. Fraction to Recurring Decimal
Calc a/b to string x.y(z)
23.09.2025
medium165. Compare Version Numbers
Compare versions x.x.x.x
22.09.2025
easy3005. Count Elements With Maximum Frequency
Count max-freq elements
21.09.2025
medium1912. Design Movie Rental System
Design Movie Rent: rent,drop,search(5 lowest), report(5 lowest rented)
20.09.2025
medium3508. Implement Router
Design Router: addPacket, forwardPacket, getCount(dst, ts start..end)
19.09.2025
medium3484. Design Spreadsheet
Design Spreadsheet: setCell, resetCell, getValue(a+b)
18.09.2025
medium3408. Design Task Manager
Design Scheduler: add, edit, remove, execute by priority
17.09.2025
medium2353. Design a Food Rating System
Food rating system: change rating, peek highest by type
16.09.2025
hard2197. Replace Non-Coprime Numbers in Array
Simulate gcd to lcm adjacent pair removal
15.09.2025
easy1935. Maximum Number of Words You Can Type
Count words with all letters
14.09.2025
medium966. Vowel Spellchecker
Spellcheck with priority: original, case, vowels
12.09.2025
medium3227. Vowels Game in a String
Can Alice win Bob both removeing odd-even vowel count substring optimally
11.09.2025
medium2785. Sort Vowels in a String
Sort vowels
08.09.2025
easy1317. Convert Integer to the Sum of Two No-Zero Integers
Find a+b=n without zeros in digits
07.09.2025
easy1304. Find N Unique Integers Sum up to Zero
Any n uniq numbers with sum of 0
06.09.2025
hard3495. Minimum Operations to Make Array Elements Zero
Sum query [a..b] of optimal pairwise /4 until range is zero
05.09.2025
medium2749. Minimum Operations to Make the Integer Zero
Min ops to subtract n2+2^(0..60) from n1 and make n1=0
04.09.2025
easy3516. Find Closest Person
Compare two distances
30.08.2025
medium36. Valid Sudoku
Validate sudoku has no duplicates
29.08.2025
medium3021. Alice and Bob Playing Flower Game
Pairs x=1..n y=1..m for Alice to win in take from (x+y) game
28.08.2025
medium3446. Sort Matrix by Diagonals
Sort bottom left and top right diagonals
26.08.2025
medium3000. Maximum Area of Longest Diagonal Rectangle
Max area of max diagonal rectangles
25.08.2025
medium498. Diagonal Traverse
Matrix diagonal traversal
24.08.2025
medium1493. Longest Subarray of 1's After Deleting One Element
Max 1-subarray after removing one elemnt pointers
22.08.2025
medium3195. Find the Minimum Area to Cover All Ones I
Min all-1 rectangle
21.08.2025
medium1504. Count Submatrices With All Ones
Count islands of 1
20.08.2025
medium1277. Count Square Submatrices with All Ones
Count square islands of 1
19.08.2025
medium2348. Number of Zero-Filled Subarrays
Count 0-subarrays
16.08.2025
easy1323. Maximum 69 Number
Bigger number by replacing 6 to 9
15.08.2025
easy342. Power of Four
Is number power of 4?
14.08.2025
easy2264. Largest 3-Same-Digit Number in String
Max 3-digit in string
13.08.2025
easy326. Power of Three
Is n power of 3?
12.08.2025
medium2787. Ways to Express an Integer as Sum of Powers
Ways to make n by sum of a^x+b^x+...
11.08.2025
medium2438. Range Product Queries of Powers
Range product queries of powers of two from n
10.08.2025
medium869. Reordered Power of 2
Rearrange digits to make power of two
9.08.2025
easy231. Power of Two
Is int 32 power of 2?
8.08.2025
medium808. Soup Servings
Probability A empty first plus both empty /2
6.08.2025
medium3479. Fruits Into Baskets III
Place fruits left to right to first available bucket tree
5.08.2025
easy3477. Fruits Into Baskets II
Place fruits left to right to first available bucket
4.08.2025
medium904. Fruit Into Baskets
Max consequent two-types range
3.08.2025
hard2106. Maximum Fruits Harvested After at Most K Steps
Max values k steps from start point window
1.08.2025
easy118. Pascal's Triangle
Pascal's Triangle
31.07.2025
medium898. Bitwise ORs of Subarrays
Uniq OR-subarrays
30.07.2025
medium2419. Longest Subarray With Maximum Bitwise AND
Longest max OR subarray
29.07.2025
medium2411. Smallest Subarrays With Maximum Bitwise OR
Shortest max OR i.. subarrays pointers
28.07.2025
medium2044. Count Number of Maximum Bitwise-OR Subsets
Subsequencies with max OR
27.07.2025
easy2210. Count Hills and Valleys in an Array
Count hills and valleys
25.07.2025
easy3487. Maximum Unique Subarray Sum After Deletion
Max non-empty uniq subsequence sum
23.07.2025
medium1717. Maximum Score From Removing Substrings
Max removals ab=x, ba=y
22.07.2025
medium1695. Maximum Erasure Value
Max unique subarray sum window
21.07.2025
easy1957. Delete Characters to Make Fancy String
No three chars repeats
19.07.2025
hard1233. Remove Sub-Folders from the Filesystem
Fold folders
18.07.2025
hard2163. Minimum Difference in Sums After Removal of Elements
Min first half - second half after removing n/3
17.07.2025
medium3202. Find the Maximum Length of Valid Subsequence II
Longest same-pair-k-parity subsequence
16.07.2025
medium3201. Find the Maximum Length of Valid Subsequence I
Longest same-pair-parity subsequence
14.07.2025
easy1290. Convert Binary Number in a Linked List to Integer
Binary linked list to decimal
13.07.2025
medium2410. Maximum Matching of Players With Trainers
Count trainers for players
11.07.2025
hard2402. Meeting Rooms III
Most frequent meeting room
10.07.2025
medium3440. Reschedule Meetings for Maximum Free Time II
Max free time after moving 1 event
9.07.2025
medium3439. Reschedule Meetings for Maximum Free Time I
Max free time after moving k events together window
8.07.2025
hard1751. Maximum Number of Events That Can Be Attended II
Max top k valued intervals search
7.07.2025
medium1353. Maximum Number of Events That Can Be Attended
Max attended events
6.07.2025
medium1865. Finding Pairs With a Certain Sum
Design pairs counter; two lists, one changes
5.07.2025
easy1394. Find Lucky Integer in an Array
Max x == freq(x)
4.07.2025
hard3307. Find the K-th Character in String Game II
kth char in double+shift by ops[i] string manipulation
3.07.2025
easy3304. Find the K-th Character in String Game I
kth char after appending rotated self
2.07.2025
hard3333. Find the Original Typed String II
ways to remove duplicates, preserve length at least k
30.06.2025
easy594. Longest Harmonious Subsequence
Longest subsequence with max-min=1 pointers
29.06.2025
medium1498. Number of Subsequences That Satisfy the Given Sum Condition
Subsequencies target in 0..min+max search pointers
28.06.2025
easy2099. Find Subsequence of Length K With the Largest Sum
Subsequence of k largest
27.06.2025
hard2014. Longest Subsequence Repeated k Times
Longest k-repeating subsequence
26.06.2025
medium2311. Longest Binary Subsequence Less Than or Equal to K
Longest binary subsequence less than K
24.06.2025
easy2200. Find All K-Distant Indices in an Array
Indices k-distant to key
23.06.2025
hard2081. Sum of k-Mirror Numbers
n palindromes in both 10 and k-base
22.06.2025
easy2138. Divide a String Into Groups of Size k
k-chunked string, filled tail
21.06.2025
medium3085. Minimum Deletions to Make String K-Special
Min remove to make frequencies k-narrow
20.06.2025
medium3443. Maximum Manhattan Distance After K Changes
Max distance after k flips
19.06.2025
medium2294. Partition Array Such That Maximum Difference Is K
k-narrow subsequences
18.06.2025
medium2966. Divide Array Into Arrays With Max Difference
List of k-narrow tripplets
17.06.2025
hard3405. Count the Number of Arrays with K Matching Adjacent Elements
Combinations k equal siblings 1..m in [n] array
16.06.2025
easy2016. Maximum Difference Between Increasing Elements
Max increasing pair diff
15.06.2025
medium1432. Max Difference You Can Get From Changing an Integer
Max - min, replacing any digit, no leading zeros
14.06.2025
easy2566. Maximum Difference by Remapping a Digit
Max - min, replacing any digit
13.06.2025
medium2616. Minimize the Maximum Difference of Pairs
Min max diffs non-overlapped pairs search
12.06.2025
easy3423. Maximum Difference Between Adjacent Elements in a Circular Array
Max abs sibling diff
11.06.2025
hard3445. Maximum Difference Between Even and Odd Frequency II
Max odd - min even frequency, window at least k
10.06.2025
easy3442. Maximum Difference Between Even and Odd Frequency I
Max odd - min even frequency
09.06.2025
hard440. K-th Smallest in Lexicographical Order
k-th lexicographical number of 1..n
08.06.2025
medium386. Lexicographical Numbers
Generate lexicographical numbers 1..n
07.06.2025
medium3170. Lexicographically Minimum String After Removing Stars
Smallest string by remove min to the left of
06.06.2025
medium2434. Using a Robot to Print the Lexicographically Smallest String
Smallest string by writing to stack
05.06.2025
medium1061. Lexicographically Smallest Equivalent String
Map by smallest in group from associate s1 with s2
04.06.2025
medium3403. Find the Lexicographically Largest String From the Box I
Max string of every split by n
03.06.2025
hard1298. Maximum Candies You Can Get from Boxes
Open boxes graph with keys simulation
02.06.2025
hard135. Candy
Min candies, fair siblings by ratings
01.06.2025
medium2929. Distribute Candies Among Children II
Ways to give limited from n candies to 3 kids
31.05.2025
medium909. Snakes and Ladders
Shortest path bottom-top in zig-zag matrix with jumps
30.05.2025
medium2359. Find Closest Node to Given Two Nodes
Closest common node
29.05.2025
hard3373. Maximize the Number of Target Nodes After Connecting Trees II
Max even-edged siblings after merging trees
28.05.2025
medium3372. Maximize the Number of Target Nodes After Connecting Trees I
Max k-reachable nodes of merged trees
27.05.2025
easy2894. Divisible and Non-divisible Sums Difference
Sum non-divisible minus sum divisible
26.05.2025
hard1857. Largest Color Value in a Directed Graph
Max color freq path
25.05.2025
medium2131. Longest Palindrome by Concatenating Two Letter Words
Max palindrome length from 2 char words
24.05.2025
easy2942. Find Words Containing Character
Indices with x
23.05.2025
hard3068. Find the Maximum Sum of Node Values
Max sum by k-xoring edges
22.05.2025
medium3362. Zero Array Transformation III
Max removed queries still zero-fy an array
21.05.2025
medium73. Set Matrix Zeroes
Zero-fy rows and columns
20.05.2025
medium3355. Zero Array Transformation I
Can intersecting intervals decrease an array sweep
19.05.2025
easy3024. Type of Triangle
Triangle type by lengths
18.05.2025
hard1931. Painting a Grid With Three Different Colors
Ways to 3-color m n grid, no adjucents
17.05.2025
medium75. Sort Colors
Sort 0,1,2 array pointers
16.05.2025
medium2901. Longest Unequal Adjacent Groups Subsequence II
Longest subsequence humming distance 1, alterating groups
15.05.2025
easy2900. Longest Unequal Adjacent Groups Subsequence I
Longest subsequence alterating g
14.05.2025
hard3337. Total Characters in String After Transformations II
t steps to convert char into next nums[c] chars
13.05.2025
medium3335. Total Characters in String After Transformations I
String length after t shifts c=c+1,z=ab
12.05.2025
easy2094. Finding 3-Digit Even Numbers
Triple digit even numbers from digits
11.05.2025
easy1550. Three Consecutive Odds
odds
10.05.2025
medium2918. Minimum Equal Sum of Two Arrays After Replacing Zeros
Min equal array sum, fill zeros
09.05.2025
hard3343. Count Number of Balanced Permutations
Permutations of even-odd position sums equal
08.05.2025
medium3342. Find Minimum Time to Reach Last Room II
Fastest travel in graph, alternating dt=1,2
07.05.2025
medium3341. Find Minimum Time to Reach Last Room I
Fastest path in graph
06.05.2025
easy1920. Build Array from Permutation
n[n[i]]
05.05.2025
medium790. Domino and Tromino Tiling
Ways to fill 2xn board with I,L shapes
04.05.2025
easy1128. Number of Equivalent Domino Pairs
Dominoes pairs
03.05.2025
medium1007. Minimum Domino Rotations For Equal Row
Min swaps to make a top or bottom row
02.05.2025
medium838. Push Dominoes
Dominoes simulation
01.05.2025
hard2071. Maximum Number of Tasks You Can Assign
Tasks can be done by workers with pills search
30.04.2025
easy1295. Find Numbers with Even Number of Digits
Even length numbers
29.04.2025
medium2962. Count Subarrays Where Max Element Appears at Least K Times
Subarrays at least k maxes pointers
28.04.2025
hard2302. Count Subarrays With Score Less Than K
Subarrays sum cnt <= k pointers
27.04.2025
easy3392. Count Subarrays of Length Three With a Condition
subarrays 2a + 2c == b
26.04.2025
hard2444. Count Subarrays With Fixed Bounds
Subarrays with min=minK, max=maxK pointers
25.04.2025
medium2845. Count of Interesting Subarrays
Subarrays, count a[i]%m=k is c%m=k map
24.04.2025
medium2799. Count Complete Subarrays in an Array
Subarrays having all uniqs pointers
23.04.2025
easy1399. Count Largest Group
Count of max groups by digits sum 1..n
21.04.2025
medium2145. Count the Hidden Sequences
Possible arrays from diff array and lo..hi
20.04.2025
medium781. Rabbits in Forest
Count total rabbits from other numbers
19.04.2025
medium2563. Count the Number of Fair Pairs
Pairs a + b in lower..upper pointers
18.04.2025
medium38. Count and Say
nth run-length encoded string
17.04.2025
easy2176. Count Equal and Divisible Pairs in an Array
Pairs a[i] == b[j], i j % k == 0
16.04.2025
medium2537. Count the Number of Good Subarrays
Subarrays with at least k equal pairs window
15.04.2025
hard2179. Count Good Triplets in an Array
Triplets in same order in both (0..n)-arrays
14.04.2025
easy1534. Count Good Triplets
Triplets with diff less than a,b,c
13.04.2025
medium1922. Count Good Numbers
Count (0,2,4,6,8)(2,3,5,7) generated strings of length n
12.04.2025
hard3272. Find the Count of Good Integers
Count palindromes of length n, divisible by k
11.04.2025
easy2843. Count Symmetric Integers
Numbers with equal half' sums
10.04.2025
hard2999. Count the Number of Powerful Integers
Numbers in range start..finish, digits up to limit
09.04.2025
easy3375. Minimum Operations to Make Array Values Equal to K
Count number bigger than k
08.04.2025
easy3396. Minimum Number of Operations to Make Elements in Array Distinct
Count removals 3-prefixes to deduplicate
07.04.2025
medium416. Partition Equal Subset Sum
Two equal sum subsets
06.04.2025
medium368. Largest Divisible Subset
Longest all pairs divisible subset
05.04.2025
easy1863. Sum of All Subset XOR Totals
Sum of all subsets xors
04.04.2025
medium1123. Lowest Common Ancestor of Deepest Leaves
Lowest common ancestor of deepest tree nodes
03.04.2025
medium2874. Maximum Value of an Ordered Triplet II
Max (a[i] - a[j]) a[k]
02.04.2025
easy2873. Maximum Value of an Ordered Triplet I
Max (a[i] - a[j]) a[k]
01.04.2025
medium2140. Solving Questions With Brainpower
Max sum of (points, skip next) pairs
31.03.2025
hard2551. Put Marbles in Bags
Max split sum - min split sum of borders
30.03.2025
medium763. Partition Labels
Split string into separate chars sets
29.03.2025
hard2818. Apply Operations to Maximize Score
Multiply k numbers with max prime factor count stack
28.03.2025
hard2503. Maximum Number of Points From Grid Queries
Running queries of increasing BFS
27.03.2025
medium2780. Minimum Index of a Valid Split
Min split index to have equal majority elements
26.03.2025
medium2033. Minimum Operations to Make a Uni-Value Grid
Min sum of differences of x times
25.03.2025
medium3394. Check if Grid can be Cut into Sections
non-intersecting ranges on x or y axis sweep
24.03.2025
medium3169. Count Days Without Meetings
Days of non-intersecting intervals sweep
23.03.2025
medium1976. Number of Ways to Arrive at Destination
Count optimal paths from 0 to n - 1 ford
22.03.2025
medium2685. Count the Number of Complete Components
Count fully connected components
21.03.2025
medium2115. Find All Possible Recipes from Given Supplies
Valid recipes from supplies
20.03.2025
hard3108. Minimum Cost Walk in Weighted Graph
Min AND of path weights manipulation
19.03.2025
medium3191. Minimum Operations to Make Binary Array Elements Equal to One I
bits flips to make all 1 manipulation
18.03.2025
medium2401. Longest Nice Subarray
Max window of all pairs AND zero pointers manipulation
17.03.2025
easy2206. Divide Array Into Equal Pairs
All numbers in pairs
16.03.2025
medium2594. Minimum Time to Repair Cars
Min rank[i] count^2 to fix all cars search
15.03.2025
medium2560. House Robber IV
Min-max of non-adjucents in array search
14.03.2025
medium2226. Maximum Candies Allocated to K Children
Distribute candies to k equal buckets search
13.03.2025
medium3356. Zero Array Transformation II
Min queries (l..r, v) to decrease nums by v to 0 sweep
12.03.2025
easy2529. Maximum Count of Positive Integer and Negative Integer
Max positive count or negative count search
11.03.2025
medium1358. Number of Substrings Containing All Three Characters
Substrings with [abc] pointers
10.03.2025
medium3306. Count of Substrings Containing Every Vowel and K Consonants II
Substring with all vowels and k others pointers
09.03.2025
medium3208. Alternating Groups II
Count cycling alterating k-subarrays pointers
08.03.2025
easy2379. Minimum Recolors to Get K Consecutive Black Blocks
Min 'W' flips to make k 'B' window
07.03.2025
medium2523. Closest Prime Numbers in Range
Min diff primes pair in left..right
06.03.2025
easy2965. Find Missing and Repeated Values
Missing and repeated in 1..n array
05.03.2025
medium2579. Count Total Number of Colored Cells
Arithmetic sum
04.03.2025
medium1780. Check if Number is a Sum of Powers of Three
Number as the sum of distinct powers of 3
03.03.2025
medium2161. Partition Array According to Given Pivot
Partition around p
02.03.2025
easy2570. Merge Two 2D Arrays by Summing Values
Merge two ascending [key, value] lists
01.03.2025
easy2460. Apply Operations to an Array
If a[i] == a[i + 1], a[i] = 2, a[i + 1] = 0
28.02.2025
hard1092. Shortest Common Supersequence
Shortest string with both subsequences
27.02.2025
medium873. Length of Longest Fibonacci Subsequence
Longest sequence a, b, a + b programming
26.02.2025
medium1749. Maximum Absolute Sum of Any Subarray
Max abs of subarray sum sum
25.02.2025
medium1524. Number of Sub-arrays With Odd Sum
Count odd sum subarrays sum
24.02.2025
medium2467. Most Profitable Path in a Tree
Max Alice path down, Bob up in tree
23.02.2025
medium889. Construct Binary Tree from Preorder and Postorder Traversal
Tree from preorder & postorder
22.02.2025
hard1028. Recover a Tree From Preorder Traversal
Recover binary tree from depth-dashes string
21.02.2025
medium1261. Find Elements in a Contaminated Binary Tree
Is number in a tree 2 v+(1L, 2R)?
20.02.2025
medium1980. Find Unique Binary String
Binary number not in a set
19.02.2025
medium1415. The k-th Lexicographical String of All Happy Strings of Length n
kth string of abc permutations
18.02.2025
medium2375. Construct Smallest Number From DI String
Smallest number from 1..9 and Inc-Dec pattern
17.02.2025
medium1079. Letter Tile Possibilities
Count uniq sequences from letters
16.02.2025
medium1718. Construct the Lexicographically Largest Valid Sequence
Construct array x = 1..n, a[i] = x, a[i + x] = x
15.02.2025
medium2698. Find the Punishment Number of an Integer
Sum x^2 if it's string partition sum = x
14.02.2025
medium1352. Product of the Last K Numbers
Running suffix product product
13.02.2025
medium3066. Minimum Operations to Exceed Threshold Value II
Count nums += min(x,y) 2+max(x,y) < k
12.02.2025
medium2342. Max Sum of a Pair With Equal Sum of Digits
Max pairs sum with equal digits sum
11.02.2025
medium1910. Remove All Occurrences of a Substring
Remove substring recursively
10.02.2025
easy3174. Clear Digits
Remove [char][digit] pairs from string
09.02.2025
medium2364. Count Number of Bad Pairs
Count pairs a[i] - a[j] != j - i
08.02.2025
medium2349. Design a Number Container System
Smallest running index of number in map
07.02.2025
medium3160. Find the Number of Distinct Colors Among the Balls
Running colors counter
06.02.2025
medium1726. Tuple with Same Product
Count uniq 4-tupples a b=c d
05.02.2025
easy1790. Check if One String Swap Can Make Strings Equal
One swap to make stings equal
04.02.2025
easy1800. Maximum Ascending Subarray Sum
Max increasing subarray sum
03.02.2025
easy3105. Longest Strictly Increasing or Strictly Decreasing Subarray
Longest strict monotonic subarray
02.02.2025
easy1752. Check if Array Is Sorted and Rotated
Is array sorted and rotated?
01.02.2025
easy3151. Special Array I
All siblings even-odd
31.01.2025
hard827. Making A Large Island
Max area after filling one empty 2D grid cell find
30.01.2025
hard2493. Divide Nodes Into the Maximum Number of Groups
Max count of bipartitions in a graph
29.01.2025
medium684. Redundant Connection
First edge making a cycle in graph find
28.01.2025
medium2658. Maximum Number of Fish in a Grid
Largest region in 2D grid
27.01.2025
medium1462. Course Schedule IV
All innodes for each query in graph warshall
26.01.2025
hard2127. Maximum Employees to Be Invited to a Meeting
Max connected siblings in graph
25.01.2025
medium2948. Make Lexicographically Smallest Array by Swapping Elements
Sort by swapping ab, where abs(a - b) < limit
24.01.2025
medium802. Find Eventual Safe States
Nodes without cycles
23.01.2025
medium1267. Count Servers that Communicate
Connected servers by row or column
22.01.2025
medium1765. Map of Highest Peak
Make growing landscape
21.01.2025
medium2017. Grid Game
Maximum of minimized paths sum
20.01.2025
medium2661. First Completely Painted Row or Column
Index of the first filled row/column in 2D matrix
19.01.2025
hard407. Trapping Rain Water II
Trap the water in 2D height matrix
18.01.2025
hard1368. Minimum Cost to Make at Least One Valid Path in a Grid
Min undirected jumps to reach the end in grid
17.01.2025
medium2683. Neighboring Bitwise XOR
Can restore next-sibl-xored array?
16.01.2025
medium2425. Bitwise XOR of All Pairings
Xor of all pairs xors
15.01.2025
medium2429. Minimize XOR
Min xor with num1, bits count of num2
14.01.2025
medium2657. Find the Prefix Common Array of Two Arrays
A[..i] and B[..i] intersections sizes
13.01.2025
medium3223. Minimum Length of String After Operations
Length after removing repeatings > 2
12.01.2025
medium2116. Check if a Parentheses String Can Be Valid
Balance parenthesis with wildcards
11.01.2025
medium1400. Construct K Palindrome Strings
Can make k palindromes from string?
10.01.2025
medium916. Word Subsets
Words containing all chars of words2
09.01.2025
easy2185. Counting Words With a Given Prefix
Count words with prefix
08.01.2025
easy3042. Count Prefix and Suffix Pairs I
Count prefix-suffix matched pairs
07.01.2025
easy1408. String Matching in an Array
All substrings
06.01.2025
medium1769. Minimum Number of Operations to Move All Balls to Each Box
Sum distances to all 1 for every position sum
05.01.2025
medium2381. Shifting Letters II
Apply from..to, direction shifts to string chars sweep
04.01.2025
medium1930. Unique Length-3 Palindromic Subsequences
Count palindromes of length 3
03.01.2025
medium2270. Number of Ways to Split Array
Count splits left sum >= right sum sum
02.01.2025
medium2559. Count Vowel Strings in Ranges
Count words[q[0]..q[1]] starting and ending with "aeiou"
01.01.2025
easy1422. Maximum Score After Splitting a String
Max(left zeros + right ones)
31.12.2024
medium983. Minimum Cost For Tickets
Min sum buying 1,7,30-days tickets to travel all days programming
30.12.2024
medium2466. Count Ways To Build Good Strings
Ways to make 01-string length of low..high programming
29.12.2024
hard1639. Number of Ways to Form a Target String Given a Dictionary
Ways to make target with increasing positions in words programming
28.12.2024
hard689. Maximum Sum of 3 Non-Overlapping Subarrays
max non-intersecting intervals programming window
27.12.2024
medium1014. Best Sightseeing Pair
Max (a[i] + a[j] + i - j), i > j
26.12.2024
medium494. Target Sum
Count signs permutations to sum equal target programming
25.12.2024
medium515. Find Largest Value in Each Tree Row
Tree layers maxes
24.12.2024
hard3203. Find Minimum Diameter After Merging Two Trees
Diameter of 2 connected trees
23.12.2024
medium2471. Minimum Number of Operations to Sort a Binary Tree by Level
Min swaps to sort tree layers
22.12.2024
hard2940. Find Building Where Alice and Bob Can Meet
Common indices t, h[t] > h[a], h[t] > h[b] for queries q[][a,b] stack
21.12.2024
hard2872. Maximum Number of K-Divisible Components
Max connected components divisible by k in graph
20.12.2024
medium2415. Reverse Odd Levels of Binary Tree
Odd-levels reversal in a perfect tree
19.12.2024
medium769. Max Chunks To Make Sorted
Maximum independent chunks to merge-sort array
18.12.2024
easy1475. Final Prices With a Special Discount in a Shop
Subtract next smaller value stack
17.12.2024
medium2182. Construct String With Repeat Limit
Max lexical ordered with repeat limit string sort
16.12.2024
easy3264. Final Array State After K Multiplication Operations I
Mutliply k minimums
15.12.2024
medium1792. Maximum Average Pass Ratio
Arrange passed students to improve average score
14.12.2024
medium2762. Continuous Subarrays
Count subarrays with difference <= 2 queue set
13.12.2024
medium2593. Find Score of an Array After Marking All Elements
Sum of minimums in order excluding siblings stack
12.12.2024
medium2558. Take Gifts From the Richest Pile
Sum after k-Sqrt of tops in array
11.12.2024
medium2779. Maximum Beauty of an Array After Applying Operation
Max equal nums after adjusting to [-k..+k] search sweep
10.12.2024
medium2981. Find Longest Special Substring That Occurs Thrice I
Max same-char 3-windows length window
09.12.2024
medium3152. Special Array II
Queries is all adjucents parity differ [i..j] pointers
08.12.2024
medium2054. Two Best Non-Overlapping Events
Max two non-overlapping intervals search
07.12.2024
medium1760. Minimum Limit of Balls in a Bag
Max number after at most maxOperations of splitting search
06.12.2024
medium2554. Maximum Number of Integers to Choose From a Range I
Sum 1..n excluding banned until maxSum
05.12.2024
medium2337. Move Pieces to Obtain a String
Move L left and R right to match strings
04.12.2024
medium2825. Make String a Subsequence Using Cyclic Increments
Increase some chars once to make a subsequence
03.12.2024
medium2109. Adding Spaces to a String
Insert spaces into string
02.12.2024
easy1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence
Position of the prefix
01.12.2024
easy1346. Check If N and Its Double Exist
Any i != j && a[i] = 2 a[j]
30.11.2024
hard2097. Valid Arrangement of Pairs
Hierholzer algorithm
29.11.2024
hard2577. Minimum Time to Visit a Cell In a Grid
Min time start-end 4-d travel in 2D matrix with waiting
28.11.2024
hard2290. Minimum Obstacle Removal to Reach Corner
Min removals to travel first-last in 2D grid
27.11.2024
medium3243. Shortest Distance After Road Addition Queries I
Query shortest paths after adding new edges
26.11.2024
medium2924. Find Champion II
Root of the graph
25.11.2024
hard773. Sliding Puzzle
Steps to solve slide puzzle
24.11.2024
medium1975. Maximum Matrix Sum
Max sum of 2D matrix after multiply by -1 adjacent cells
23.11.2024
medium1861. Rotating the Box
Rotate matrix and simulate the fall
22.11.2024
medium1072. Flip Columns For Maximum Number of Equal Rows
Max same-bit-rows after flipping columns in 01-2D matrix
21.11.2024
medium2257. Count Unguarded Cells in the Grid
Count unseen cells in 2D matrix with guards and walls
20.11.2024
medium2516. Take K of Each Character From Left and Right
Min take k of a,b,c from head or tail pointers
19.11.2024
medium2461. Maximum Sum of Distinct Subarrays With Length K
Max k-unique window sum window
18.11.2024
easy1652. Defuse the Bomb
Next +-k window sums window
17.11.2024
hard862. Shortest Subarray with Sum at Least K
Min subarray with sum at least k queue
16.11.2024
medium3254. Find the Power of K-Size Subarrays I
Tops of consecutive increasing windows window
15.11.2024
medium1574. Shortest Subarray to be Removed to Make Array Sorted
Min subarray remove to make array sorted pointers
14.11.2024
medium2064. Minimized Maximum of Products Distributed to Any Store
Min of max of quantities spread by n single-type stores search
13.11.2024
medium2563. Count the Number of Fair Pairs
Count pairs a[i] + a[j] in lower..upper search pointers
12.11.2024
medium2070. Most Beautiful Item for Each Query
Queries of max beauty for q[i] price search
11.11.2024
medium2601. Prime Subtraction Operation
Increased sequence by subtracting primes? search
10.11.2024
medium3097. Shortest Subarray With OR at Least K II
Min subarray with OR[..] >= k manipulation window
09.11.2024
medium3133. Minimum Array End
nth of increasing sequence with AND[..]=x manipulation
08.11.2024
medium1829. Maximum XOR for Each Query
Running xor to make 2^k-1 manipulation
07.11.2024
medium2275. Largest Combination With Bitwise AND Greater Than Zero
Max positive AND-subset manipulation
06.11.2024
medium3011. Find if Array Can Be Sorted
Can array be sorted by adjacent swap same-1-bits-nums
05.11.2024
medium2914. Minimum Number of Changes to Make Binary String Beautiful
Min changes to make even-sized 0 and 1
04.11.2024
medium3163. String Compression III
Compress repeating chars in string pointers
03.11.2024
easy796. Rotate String
Is string rotated goal?
02.11.2024
easy2490. Circular Sentence
Are words circular?
01.11.2024
easy1957. Delete Characters to Make Fancy String
Filter 3+ repeating chars from string
31.10.2024
hard2463. Minimum Total Distance Traveled
Min robots[x] travel to factories[x,capacity] programming
30.10.2024
hard1671. Minimum Number of Removals to Make Mountain Array
Min removes to make a mountain programming search
29.10.2024
medium2684. Maximum Number of Moves in a Grid
Max increasing path from left to right in 2D matrix programming
28.10.2024
medium2501. Longest Square Streak in an Array
Longest quadratic subset
27.10.2024
medium1277. Count Square Submatrices with All Ones
Count 1-filled squares in 2D matrix programming
26.10.2024
hard2458. Height of Binary Tree After Subtree Removal Queries
n new heights by cutting nodes in a Tree
25.10.2024
medium1233. Remove Sub-Folders from the Filesystem
Remove empty subfolders
24.10.2024
medium951. Flip Equivalent Binary Trees
Are trees flip-equal
23.10.2024
medium2641. Cousins in Binary Tree II
Replace Tree's values with cousines sum
22.10.2024
medium2583. Kth Largest Sum in a Binary Tree
kth largest level-sum in a tree
21.10.2024
medium1593. Split a String Into the Max Number of Unique Substrings
Max count of unique split parts
20.10.2024
hard1106. Parsing A Boolean Expression
before evaluation, index i should point at the first token of the subproblem
19.10.2024
medium1545. Find Kth Bit in Nth Binary String
kth bit of sequence bs[i] = bs[i-1] + '1' + rev(inv(bs[i-1])) manipulation
18.10.2024
medium2044. Count Number of Maximum Bitwise-OR Subsets
Count subsequences with max bitwise or
17.10.2024
medium670. Maximum Swap
Max number after a single digits swap
16.10.2024
medium1405. Longest Happy String
Longest string of a, b, c not repeating 3 times
15.10.2024
medium2938. Separate Black and White Balls
Min moves to sort 01 string
14.10.2024
medium2530. Maximal Score After Applying K Operations
Replace max(arr) with ceil(max/3) k times
13.10.2024
hard632. Smallest Range Covering Elements from K Lists
Smallest intersection of k sorted lists set
12.10.2024
medium2406. Divide Intervals Into Minimum Number of Groups
Count non-intersecting groups of intervals
11.10.2024
medium1942. The Number of the Smallest Unoccupied Chair
target's chair number when chairs reused by multiple [arrival, leave] times
10.10.2024
medium962. Maximum Width Ramp
Max j-i between a[i] <= a[j] in an array stack
09.10.2024
medium921. Minimum Add to Make Parentheses Valid
Minimum inserts to balance brackets
08.10.2024
medium1963. Minimum Number of Swaps to Make the String Balanced
Min swaps to balance brackets pointers
07.10.2024
easy2696. Minimum String Length After Removing Substrings
Remove 'AB' and 'CD' from the string
06.10.2024
medium1813. Sentence Similarity III
Are strings equal after inserting substring?
05.10.2024
medium567. Permutation in String
Is s2 contains permutation of s1? pointers
04.10.2024
medium2491. Divide Players Into Teams of Equal Skill
Sum of products of pairs with equal sums
03.10.2024
medium1590. Make Sum Divisible by P
Min removed subarray length to make remainder % p = 0
02.10.2024
easy1331. Rank Transform of an Array
Array values to their sorted set positions
01.10.2024
medium1497. Check If Array Pairs Are Divisible by k
Can all pairs sums be k-even?
30.09.2024
medium1381. Design a Stack With Increment Operation
Stack with range increment operation
29.09.2024
hard432. All O`one Data Structure
Count usage frequencies in O(1) list
28.09.2024
medium641. Design Circular Deque
Ring buffer
27.09.2024
medium731. My Calendar II
Add intervals intersecting less than two times sweep
26.09.2024
medium729. My Calendar I
Insert non-intersection interval search
25.09.2024
hard2416. Sum of Prefix Scores of Strings
Counts of words with same prefixes
24.09.2024
medium3043. Find the Length of the Longest Common Prefix
Common digit prefix between all pairs of two num arrays
23.09.2024
hard2707. Extra Characters in a String
Min extra chars to form an s from dictionary programming
22.09.2024
hard440. K-th Smallest in Lexicographical Order
k lexicographically smallest value from 1..n
21.09.2024
medium386. Lexicographical Numbers
Lexicographical ordered numbers 1..n
20.09.2024
hard214. Shortest Palindrome
Prepend to make the shortest palindrome hash
19.09.2024
medium241. Different Ways to Add Parentheses
Eval all possible parenthesis placements programming
18.09.2024
medium179. Largest Number
Concatenate nums to largest number
17.09.2024
easy884. Uncommon Words from Two Sentences
Unique words from two strings
16.09.2024
medium539. Minimum Time Difference
Min difference in a list of times hh:mm
15.09.2024
medium1371. Find the Longest Substring Containing Vowels in Even Counts
Longest substring with even number of "aeiou" manipulation pointers
14.09.2024
medium2419. Longest Subarray With Maximum Bitwise AND
Max bitwise AND subarray manipulation pointers
13.09.2024
medium1310. XOR Queries of a Subarray
Run queries[[from, to]] of xor(arr[from..to]) manipulation
12.09.2024
easy1684. Count the Number of Consistent Strings
Count words with allowed characters
11.09.2024
easy2220. Minimum Bit Flips to Convert Number
Bit diff between two numbers manipulation
10.09.2024
medium2807. Insert Greatest Common Divisors in Linked List
Insert gcd in-between LinkedList nodes list
09.09.2024
medium2326. Spiral Matrix IV
LinkedList to spiral 2D matrix list
08.09.2024
medium725. Split Linked List in Parts
Split LinkedList into k parts list
07.09.2024
medium1367. Linked List in Binary Tree
Is the LinkedList in the BinaryTree? list
06.09.2024
medium3217. Delete Nodes From Linked List Present in Array
Remove nums from a Linked List list
05.09.2024
medium2028. Find Missing Observations
Find n numbers to make [n m]/(n+m)=mean
04.09.2024
medium874. Walking Robot Simulation
Max distance after robot moves simulation
03.09.2024
easy1945. Sum of Digits of String After Convert
Sum of number chars k times
02.09.2024
medium1894. Find the Student that Will Replace the Chalk
Position of a k sum in a cyclic array
01.09.2024
easy2022. Convert 1D Array Into 2D Array
D to 2D mxn array
31.08.2024
medium1514. Path with Maximum Probability
Max path in graph
30.08.2024
hard2699. Modify Graph Edge Weights
Assign vacant -1 weight in graph to make shorted path equal target
29.08.2024
medium947. Most Stones Removed with Same Row or Column
Count islands of intersecting x and y
28.08.2024
medium1905. Count Sub Islands
Count islands intersecting in both 2D grids
27.08.2024
medium1514. Path with Maximum Probability
Max path in a weighted graph
25.08.2024
easy145. Binary Tree Postorder Traversal
Postorder tree traversal tree
24.08.2024
hard564. Find the Closest Palindrome
Closest palindrome number
23.08.2024
easy592. Fraction Addition and Subtraction
Eval string of fractions sum
22.08.2024
easy476. Number Complement
Invert bits: 101 becomes 010 manipulation
21.08.2024
hard664. Strange Printer
Minimum continuous replacements to make a string programming
20.08.2024
medium1140. Stone Game II
Max Alice price taking 1..2m piles optimally with Bob programming
19.08.2024
medium650. 2 Keys Keyboard
Min copy-pastes to make n A's from one programming
18.08.2024
medium264. Ugly Number II
nth number with only [1,2,3,5] multipliers
17.08.2024
medium1937. Maximum Number of Points with Cost
Max top-down path sum with column diff in 2D matrix programming
16.08.2024
medium624. Maximum Distance in Arrays
Max diff between the arrays
15.08.2024
easy860. Lemonade Change
Simulate money exchange
14.08.2024
hard719. Find K-th Smallest Pair Distance
kth smallest pairs diff in an array search pointers
13.08.2024
medium40. Combination Sum II
Unique target sum subsequences
12.08.2024
easy703. Kth Largest Element in a Stream
kth largest in a stream of values
11.08.2024
hard1568. Minimum Number of Days to Disconnect Island
Min changes 1 to 0 to disconnect islands
10.08.2024
medium959. Regions Cut By Slashes
Count islands divided by '\' and '/' in 2D matrix
09.08.2024
medium840. Magic Squares In Grid
Count 9x9 1..9 equal row col diag sum subgrids
08.08.2024
medium885. Spiral Matrix III
D spiraling order
07.08.2024
hard273. Integer to English Words
Integer to English words
06.08.2024
medium3016. Minimum Number of Pushes to Type Word II
Minimum keystrokes after assigning letter to keys
05.08.2024
easy2053. Kth Distinct String in an Array
kth unique
04.08.2024
medium1508. Range Sum of Sorted Subarray Sums
Sum of [left..right] of sorted subarray's sums
03.08.2024
easy1460. Make Two Arrays Equal by Reversing Subarrays
Can arr transform to target by rotating subarrays?
02.08.2024
medium2134. Minimum Swaps to Group All 1's Together II
Min swaps to make a circular [01] array window
01.08.2024
easy2678. Number of Senior Citizens
Count filtered by a substring
31.07.2024
medium1105. Filling Bookcase Shelves
Min total height to split [[w,h]] array by shelfWidth programming
30.07.2024
medium1653. Minimum Deletions to Make String Balanced
Min removals to sort 'ab' string
29.07.2024
medium1395. Count Number of Teams
Count increasing or decreasing (i, j, k)
28.07.2024
hard2045. Second Minimum Time to Reach Destination
Second min time to travel from 1 to n in time-edged graph stopping every change seconds
27.07.2024
medium2976. Minimum Cost to Convert String I
Min cost to change the source to the target
26.07.2024
medium1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance
Node with minimum neighbors by distanceThreshold
25.07.2024
medium912. Sort an Array
Sort array using minimum memory
24.07.2024
medium2191. Sort the Jumbled Numbers
Sort array by digits mapping
23.07.2024
easy1636. Sort Array by Increasing Frequency
Sort by frequency or descending
22.07.2024
easy2418. Sort the People
Sort one array by another
21.07.2024
hard2392. Build a Matrix With Conditions
Build a matrix from a graph conditions
20.07.2024
medium1605. Find Valid Matrix Given Row and Column Sums
Matrix from rows and cols sums
19.07.2024
easy1380. Lucky Numbers in a Matrix
Min in rows and max in columns in a unique number matrix
18.07.2024
medium1530. Number of Good Leaf Nodes Pairs
Count at most distance paths between leaves
17.07.2024
medium1110. Delete Nodes And Return Forest
Trees after remove nodes from tree
16.07.2024
medium2096. Step-By-Step Directions From a Binary Tree Node to Another
U-L-R path from s to d in a Binary Tree
15.07.2024
medium2196. Create Binary Tree From Descriptions
Restore binary tree from [parent, child, isLeft]
14.07.2024
hard726. Number of Atoms
Simplify chemical formula parenthesis
13.07.2024
hard2751. Robot Collisions
D dimensional robots fight
12.07.2024
medium1717. Maximum Score From Removing Substrings
Max score removing from s, x for ab, y for ba
11.07.2024
medium1190. Reverse Substrings Between Each Pair of Parentheses
Reverse string in parentheses recursively
10.07.2024
easy1598. Crawler Log Folder
Filesystem path depth
9.07.2024
medium1701. Average Waiting Time
Average of intersecting intervals
8.07.2024
medium1823. Find the Winner of the Circular Game
Last of k-th excluded from 1..n
7.07.2024
easy1518. Water Bottles
Bottles drink and exchange simulation
6.07.2024
easy2582. Pass the Pillow
Loop position in increasing-decreasing array
5.07.2024
medium2058. Find the Minimum and Maximum Number of Nodes Between Critical Points
[min, max] distance between critical points in linked list list
4.07.2024
medium2181. Merge Nodes in Between Zeros
Collapse in-between 0 nodes in a LinkedList list
3.07.2024
medium1509. Minimum Difference Between Largest and Smallest Value in Three Moves
Min difference after 3 changes in array window programming
2.07.2024
easy350. Intersection of Two Arrays II
Array intersection with duplicates
1.07.2024
easy1550. Three Consecutive Odds
Has window of 3 odds?
30.06.2024
medium1579. Remove Max Number of Edges to Keep Graph Fully Traversable
Remove extra nodes in a connected graph by type 1, 2 and 3=1+2
29.06.2024
medium2192. All Ancestors of a Node in a Directed Acyclic Graph
List of ancestors in a DAG
28.06.2024
medium2285. Maximum Total Importance of Roads
Sort graph by siblings and compute sum(i s)
27.06.2024
easy1791. Find Center of Star Graph
Center of a start graph
26.06.2024
medium1382. Balance a Binary Search Tree
Make a balanced Binary Search Tree
25.06.2024
medium1038. Binary Search Tree to Greater Sum Tree
Aggregate Binary Search Tree from the right
24.06.2024
medium995. Minimum Number of K Consecutive Bit Flips
Count k-range flips in binary array to make all 1 window
23.06.2024
medium1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
Longest subarray with abs(a[i] - a[j]) <= limit window queue
22.06.2024
medium1248. Count Number of Nice Subarrays
Count subarrays with k odds window
21.06.2024
medium1052. Grumpy Bookstore Owner
Max customers sum after make consecutive minutes non-grumpy window
20.06.2024
medium1552. Magnetic Force Between Two Balls
Max shortest distance between m positions search
19.06.2024
medium1482. Minimum Number of Days to Make m Bouquets
Min days to take m k-subarrays search
18.06.2024
medium826. Most Profit Assigning Work
Max profit by assigning [profit, difficulty] to workers any times
17.06.2024
medium633. Sum of Square Numbers
Is c sum of squares? search
16.06.2024
hard330. Patching Array
Insertions to make subsets sums fill 1..n
15.06.2024
hard502. IPO
Max capital by choosing k jobs with profits[] & capital[] given w on start
14.06.2024
medium945. Minimum Increment to Make Array Unique
Min increments to make items unique
13.06.2024
easy2037. Minimum Number of Moves to Seat Everyone
Sum of diffs of sorted students and seats
12.06.2024
medium75. Sort Colors
Sort 012 array
11.06.2024
easy1122. Relative Sort Array
Sort an array by the given order
10.06.2024
easy1051. Height Checker
Count unsorted elements in array
09.06.2024
medium974. Subarray Sums Divisible by K
Count subarrays divisible by k
08.06.2024
medium523. Continuous Subarray Sum
Any subarray sum % k = 0
07.06.2024
medium648. Replace Words
Replace words with suffixes from dictionary
06.06.2024
medium846. Hand of Straights
Can array be split into consecutive groups
05.06.2024
easy1002. Find Common Characters
Common letters in words
04.06.2024
easy409. Longest Palindrome
Max palindrome length from chars
03.06.2024
medium2486. Append Characters to String to Make Subsequence
Min diff to make t substring of s
02.06.2024
easy344. Reverse String
Reverse an array
01.06.2024
easy3110. Score of a String
Sum(abs(window))
31.05.2024
medium260. Single Number III
Two not duplicated numbers from array manipulation
30.05.2024
medium1442. Count Triplets That Can Form Two Arrays of Equal XOR
Number (i,j,k) where xor arr[i..j] = xor arr[j..k] manipulation
29.05.2024
medium1404. Number of Steps to Reduce a Number in Binary Representation to One
Steps even/2, odd+1 to make binary s to 1
28.05.2024
medium1208. Get Equal Substrings Within Budget
Max substring sum(abs(s[..] - t[..])) < maxCost window
27.05.2024
easy1608. Special Array With X Elements Greater Than or Equal X
Count of more or equal nums[i] equal itself
26.05.2024
hard552. Student Attendance Record II
N times: A -> LP, L -> AP, P -> AL, at most one A, no LLL programming
25.05.2024
hard140. Word Break II
All string splits with dictionary programming
24.05.2024
hard1255. Maximum Score Words Formed by Letters
Max score of words subset from letters
23.05.2024
medium2597. The Number of Beautiful Subsets
Count subsets without k difference in them
22.05.2024
medium131. Palindrome Partitioning
All palindrome partitions programming
21.05.2024
medium78. Subsets
All subsets
20.05.2024
easy1863. Sum of All Subset XOR Totals
Sum of subsets xors
19.05.2024
hard3068. Find the Maximum Sum of Node Values
Max sum after xor k any edges in a tree
18.05.2024
medium979. Distribute Coins in Binary Tree
Min moves to spread the coins across the tree
17.05.2024
easy1325. Delete Leaves With a Given Value
Recursively remove target leafs from the tree
16.05.2024
easy2331. Evaluate Boolean Binary Tree
Evaluate tree where 0/1 is false/true and 2/3 is or/and
15.05.2024
medium2812. Find the Safest Path in a Grid
Safest path in a grid with thieves
14.05.2024
medium1219. Path with Maximum Gold
Max one-way path in matrix
13.05.2024
medium861. Score After Flipping Matrix
Max binary-row sum after toggling rows and columns
12.05.2024
easy2373. Largest Local Values in a Matrix
Max pooling by 3x3 matrix
11.05.2024
hard857. Minimum Cost to Hire K Workers
Min cost of k workers each doing quality[i] work for fair rate
10.05.2024
medium786. K-th Smallest Prime Fraction
kth arr[i]/arr[j], i < j, arr[i] < arr[j] search
09.05.2024
medium3075. Maximize Happiness of Selected Children
Sum of k maximums decreasing each step
08.05.2024
easy506. Relative Ranks
Convert results array to ranks array
07.05.2024
medium2816. Double a Number Represented as a Linked List
Double the number as a Linked List list
06.05.2024
medium2487. Remove Nodes From Linked List
Make a Linked List non-increasing list
04.05.2024
medium881. Boats to Save People
Minimum total boats with at most 2 people & limit weight pointers
03.05.2024
medium165. Compare Version Numbers
Compare version numbers
02.05.2024
easy2441. Largest Positive Integer That Exists With Its Negative
Max number that has its negative in array pointers
01.05.2024
easy2000. Reverse Prefix of Word
Reverse [..ch] prefix in string
30.04.2024
medium1915. Number of Wonderful Substrings
Count substrings with at most one odd frequency manipulation
29.04.2024
medium2997. Minimum Number of Operations to Make Array XOR Equal to K
Bit diff between k and nums xor manipulation
28.04.2024
hard834. Sum of Distances in Tree
Sums of paths to each leafs in a tree
27.04.2024
hard514. Freedom Trail
Min steps to produce key by rotating ring programming map
26.04.2024
hard1289. Minimum Falling Path Sum II
Min non-direct path top down in a 2D matrix programming
25.04.2024
medium2370. Longest Ideal Subsequence
Max length of less than k adjacent subsequence programming
24.04.2024
easy1137. N-th Tribonacci Number
nth Tribonacci number f(n + 3) = f(n) + f(n + 1) + f(n + 2)
23.04.2024
medium310. Minimum Height Trees
Center of an acyclic graph
22.04.2024
medium752. Open the Lock
Steps to rotate 4-wheel 0000 -> target
21.04.2024
easy1971. Find if Path Exists in Graph
Are source and destination connected in graph?
20.04.2024
medium1992. Find All Groups of Farmland
Count 1-rectangles in 0-1 2D matrix
19.04.2024
medium200. Number of Islands
Count 1-islands in 0-1 a 2D matrix
18.04.2024
easy463. Island Perimeter
Perimeter of 1's islands in 01-matrix
17.04.2024
medium988. Smallest String Starting From Leaf
Smallest string from leaf to root in a Binary Tree
16.04.2024
medium623. Add One Row to Tree
Insert nodes at the depth of the Binary Tree
15.04.2024
medium129. Sum Root to Leaf Numbers
Sum root-leaf numbers in a Binary Tree
14.04.2024
easy404. Sum of Left Leaves
Left-leaf sum in a Binary Tree
13.04.2024
hard85. Maximal Rectangle
Max 1-only area in a 0-1 matrix
12.04.2024
hard42. Trapping Rain Water
Trap the water in area between vertical walls
11.04.2024
medium402. Remove K Digits
Minimum number after removing k digits
10.04.2024
medium950. Reveal Cards In Increasing Order
Sort cards by rules: take top, next goes bottom
09.04.2024
easy2073. Time Needed to Buy Tickets
Seconds to buy tickets by k-th person in a rotating 1 second queue
08.04.2024
easy1700. Number of Students Unable to Eat Lunch
First sandwitch not eaten by any while popped from a queue
07.04.2024
medium678. Valid Parenthesis String
Are parenthesis valid with wildcard?
06.04.2024
medium1249. Minimum Remove to Make Valid Parentheses
Remove minimum to make parenthesis valid
05.04.2024
easy1544. Make The String Great
Remove lowercase-uppercase pairs
04.04.2024
easy1614. Maximum Nesting Depth of the Parentheses
Max nested parenthesis
03.04.2024
medium79. Word Search
Does grid have a word path?
02.04.2024
easy205. Isomorphic Strings
Can map chars from one string to another?
01.04.2024
easy58. Length of Last Word
Last word length
31.03.2024
hard2444. Count Subarrays With Fixed Bounds
Count subarrays of range minK..maxK
30.03.2024
hard992. Subarrays with K Different Integers
Count subarrays with k distinct numbers
29.03.2024
medium2962. Count Subarrays Where Max Element Appears at Least K Times
Count subarrays with at least k array max in
28.03.2024
medium2958. Length of Longest Subarray With at Most K Frequency
Max subarray length with frequencies <= k
27.03.2024
medium713. Subarray Product Less Than K
Subarrays count with product less than k
26.03.2024
hard41. First Missing Positive
First number 1.. not presented in the array, O(1) space
25.03.2024
medium442. Find All Duplicates in an Array
All duplicate numbers of 1..n using O(1) memory
24.03.2024
medium287. Find the Duplicate Number
Duplicate single number in 1..n array, no extra memory
23.03.2024
medium143. Reorder List
Reorder Linked List 1->2->3->4->5 -> 1->5->2->4->3
22.03.2024
easy234. Palindrome Linked List
Is Linked List a palindrome
21.03.2024
easy206. Reverse Linked List
Reverse a Linked List
20.03.2024
medium1669. Merge In Between Linked Lists
Replace a segment in a LinkedList
19.03.2024
medium621. Task Scheduler
Count CPU cycles if task can't run twice in n cycles
18.03.2024
medium452. Minimum Number of Arrows to Burst Balloons
Count non-intersecting intervals
17.03.2024
medium57. Insert Interval
Insert interval into a sorted intervals array
16.03.2024
medium525. Contiguous Array
Max length of subarray sum(0) == sum(1)
15.03.2024
medium238. Product of Array Except Self
Array of suffix-prefix products
14.03.2024
medium930. Binary Subarrays With Sum
Count goal-sum subarrays in a 0-1 array
13.03.2024
easy2485. Find the Pivot Integer
Pivot of 1..n where sum[1..p] == sum[p..n].
12.03.2024
medium1171. Remove Zero Sum Consecutive Nodes from Linked List
Remove consequent 0-sum items from a LinkedList
11.03.2024
medium791. Custom Sort String
Construct string from s using order
10.03.2024
easy349. Intersection of Two Arrays
Intersection of two nums arrays
09.03.2024
easy2540. Minimum Common Value
First common number in two sorted arrays
08.03.2024
easy3005. Count Elements With Maximum Frequency
Count of max-freq nums
07.03.2024
easy876. Middle of the Linked List
Middle of the Linked List
05.03.2024
medium1750. Minimum Length of String After Deleting Similar Ends
Min length after trimming matching prefix-suffix several times.
04.03.2024
medium948. Bag of Tokens
Max score converting power to token[i] and token[i] to score.
03.03.2024
medium19. Remove Nth Node From End of List
Remove nth node from the tail of linked list.
02.03.2024
easy977. Squares of a Sorted Array
Sorted squares.
01.03.2024
easy2864. Maximum Odd Binary Number
Max odd number string rearrangement.
29.02.2024
medium1609. Even Odd Tree
Binary tree levels are odd increasing and even decreasing.
28.02.2024
medium513. Find Bottom Left Tree Value
Leftmost node value of the last level of the Binary Tree.
27.02.2024
easy543. Diameter of Binary Tree
Max distance between any nodes in binary tree.
26.02.2024
easy100. Same Tree
Are two binary trees equal?
25.02.2024
hard2709. Greatest Common Divisor Traversal
Are all numbers connected through gcd?
24.02.2024
hard2092. Find All People With Secret
Who knows 0 and firstPerson's secret after group meetings at times: [personA, personB, time].
23.02.2024
medium787. Cheapest Flights Within K Stops
Cheapest travel src -> dst with at most k stops in a directed weighted graph.
22.02.2024
easy997. Find the Town Judge
Find who trusts nobody and everybody trusts him in [trust, trusted] array.
21.02.2024
medium201. Bitwise AND of Numbers Range
Bitwise AND for [left..right].
20.02.2024
easy268. Missing Number
Missing in [0..n] number.
19.02.2024
easy231. Power of Two
Is number 2^x?
18.02.2024
hard2402. Meeting Rooms III
Most frequent room of 0..
17.02.2024
medium1642. Furthest Building You Can Reach
Max index to climb diff = a[i +1] - a[i] > 0 using bricks -= diff and ladders-- for each.
16.02.2024
medium1481. Least Number of Unique Integers after K Removals
Min uniq count after removing k numbers.
15.02.2024
medium2971. Find Polygon With the Largest Perimeter
The largest subset sum(a[..i]) > a[i + 1] where a is a subset of array.
14.02.2024
medium2149. Rearrange Array Elements by Sign
Rearrange array to positive-negative sequence.
13.02.2024
easy2108. Find First Palindromic String in the Array
Find a palindrome.
12.02.2024
easy169. Majority Element
Element with frequency > nums.len / 2.
11.02.2024
medium1463. Cherry Pickup II
Maximum paths sum of two robots top-down in XY grid.
10.02.2024
medium647. Palindromic Substrings
Count palindromes substrings.
09.02.2024
medium368. Largest Divisible Subset
Longest subset of divisible by s[i] % s[j] == 0 || s[j] % s[i] == 0.
08.02.2024
medium279. Perfect Squares
Min square numbers sum up to n.
07.02.2024
medium451. Sort Characters By Frequency
Sort string by char's frequencies.
06.02.2024
medium49. Group Anagrams
Group words by chars in them.
05.02.2024
easy387. First Unique Character in a String
First non-repeating char position.
04.02.2024
hard76. Minimum Window Substring
Let's try to shorten the code
03.02.2024
medium1043. Partition Array for Maximum Sum
Max sum of partition array into chunks size of at most k filled with max value in chunk.
02.02.2024
medium1291. Sequential Digits
Numbers with sequential digits in low..high range.
01.02.2024
medium2966. Divide Array Into Arrays With Max Difference
Split array into tripples with at most k difference.
31.01.2024
medium739. Daily Temperatures
Array of distances to the next largest.
30.01.2024
medium150. Evaluate Reverse Polish Notation
Solve Reverse Polish Notation.
29.01.2024
easy232. Implement Queue using Stacks
Queue by 2 stacks.
28.01.2024
hard1074. Number of Submatrices That Sum to Target
Count submatrix target sums.
27.01.2024
hard629. K Inverse Pairs Array
Number of arrays of 1..n with k reversed order pairs.
26.01.2024
medium576. Out of Boundary Paths
Number of paths from cell in grid to out of boundary.
25.01.2024
medium1143. Longest Common Subsequence
Longest common subsequence of two strings.
24.01.2024
medium1457. Pseudo-Palindromic Paths in a Binary Tree
Count can-form-a-palindrome paths root-leaf in a binary tree.
23.01.2024
medium1239. Maximum Length of a Concatenated String with Unique Characters
Max length subsequence of strings array with unique chars.
22.01.2024
easy645. Set Mismatch
Return missing and duplicated number in 1..n array with one number replaced.
21.01.2024
medium198. House Robber
Max sum to rob non adjacent items in array.
20.01.2024
medium907. Sum of Subarray Minimums
Sum of minimums of all array ranges.
19.01.2024
medium931. Minimum Falling Path Sum
Min sum moving bottom center, left, right in 2D matrix.
18.01.2024
easy70. Climbing Stairs
Ways to climb n stairs by 1 or 2 steps.
17.01.2024
easy1207. Unique Number of Occurrences
Are array frequencies unique.
16.01.2024
medium380. Insert Delete GetRandom O(1)
Implement HashSet