Pattern

Queue

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29 entries

29 entries tagged as Queue.

02.07.2026

medium

3286. Find a Safe Walk Through a Grid

Kotlin Rust

Path to bottom-right with health points

Graph Queue Array

queue matrix 0-1 bfs breadth-first search 0-1 bfs prioritization state tracking with max health per cell

Full post LeetCode Kotlin Rust YouTube Telegram

07.05.2026

medium

3660. Jump Game IX

Kotlin Rust

Max on path jumping left-up and right-down

Binary Search Queue Array

array monotonic queue dynamic programming binary search two-pass scanning monotonic queue usage

Full post LeetCode Kotlin Rust YouTube Telegram

06.12.2025

medium

3578. Count Partitions With Max-Min Difference at Most K

Kotlin Rust

Ways to partition into parts (max-min) at most k queue

Dynamic Programming Prefix Sum Queue

deque dynamic programming sliding window monotonic queue prefix sum arrays

Full post LeetCode Kotlin Rust YouTube Telegram

03.10.2025

hard

407. Trapping Rain Water II

Kotlin Rust

Fill water in 3D

Graph Queue Sorting

priority_queue hash_set binary_heap dfs sorting two_pointers

Full post LeetCode Kotlin Rust YouTube Telegram

27.01.2025

medium

1462. Course Schedule IV

Kotlin Rust

All innodes for each query in graph warshall

Graph Queue Sorting

HashMap Set Queue DFS Topological Sort Floyd-Warshall

Full post LeetCode Kotlin Rust YouTube Telegram

18.01.2025

hard

1368. Minimum Cost to Make at Least One Valid Path in a Grid

Kotlin Rust

Min undirected jumps to reach the end in grid

Graph Queue Array

deque array dijkstra bfs 0-1-bfs priority-queue-optimization

Full post LeetCode Kotlin Rust YouTube Telegram

17.11.2024

hard

862. Shortest Subarray with Sum at Least K

Kotlin Rust

Min subarray with sum at least k queue

Heap Queue Intervals

heap queue prefix-sum sliding-window arrays subarrays

Full post LeetCode Kotlin Rust YouTube Telegram

28.09.2024

medium

641. Design Circular Deque

Kotlin Rust

Ring buffer

Two Pointers Queue Array

array linked-list pointer-arithmetic data-structures arrays

Full post LeetCode Kotlin Rust YouTube Telegram

31.08.2024

medium

1514. Path with Maximum Probability

Kotlin Rust

Max path in graph

Graph Queue Array

probability_array fold_operation relaxation_based_update looping_for_convergence probability_maximization direct_edge_weighting

Full post LeetCode Kotlin Rust YouTube Telegram

15.08.2024

easy

860. Lemonade Change

Kotlin Rust

Simulate money exchange

Simulation Queue

bills process_simulation managing_change_using_minimum_bills tracking_change_for_specific_bills array_manipulation

Full post LeetCode Kotlin Rust YouTube Telegram

28.07.2024

hard

2045. Second Minimum Time to Reach Destination

Kotlin Rust

Second min time to travel from 1 to n in time-edged graph stopping every change seconds

Graph Queue

g s q breadth-first-search dijkstra second-shortest-path-bfs

Full post LeetCode Kotlin Rust YouTube Telegram

23.06.2024

medium

1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Kotlin Rust

Longest subarray with abs(a[i] - a[j]) <= limit window queue

Sliding Window Queue

Full post LeetCode Kotlin Rust YouTube Telegram

08.05.2024

easy

506. Relative Ranks

Kotlin Rust

Convert results array to ranks array

Queue Heap Hash Map

score inds sort_unstable_by_key sort_twice index_manipulation score

Full post LeetCode Kotlin Rust YouTube Telegram

22.04.2024

medium

752. Open the Lock

Kotlin Rust

Steps to rotate 4-wheel 0000 -> target

Graph Queue

deque hash-set bfs shortest-path graph strings

Full post LeetCode Kotlin Rust YouTube Telegram

09.04.2024

easy

2073. Time Needed to Buy Tickets

Kotlin Rust

Seconds to buy tickets by k-th person in a rotating 1 second queue

Queue

one-pass-optimization arrays

Full post LeetCode Kotlin Rust YouTube Telegram

08.04.2024

easy

1700. Number of Students Unable to Eat Lunch

Kotlin Rust

First sandwitch not eaten by any while popped from a queue

Queue Simulation

students simulation frequency_counting using_counts_array students

Full post LeetCode Kotlin Rust YouTube Telegram

29.01.2024

easy

232. Implement Queue using Stacks

Kotlin Rust

Queue by 2 stacks.

Queue

Full post LeetCode Kotlin Rust YouTube Telegram

15.11.2023

medium

1846. Maximum Element After Decreasing and Rearranging

Kotlin

Max number from converting array to non decreasing

Queue Heap Hash Map

priority-queue sorting priority-queue-for-max arrays

Full post LeetCode Kotlin Telegram

18.09.2023

easy

1337. The K Weakest Rows in a Matrix

Kotlin

k indices with smallest row sum in a binary matrix

Queue Heap Sorting

matrix priority_queue sorting arrays strings

Full post LeetCode Kotlin Telegram

28.08.2023

easy

225. Implement Stack using Queues

Kotlin

Create a Stack using Queue's push/pop methods.

Stack Queue

queue linked-list rotation data-structures queues

Full post LeetCode Kotlin Telegram

22.07.2023

medium

688. Knight Probability in Chessboard

Kotlin

Probability of making k steps on a chessboard without stepping outside

Graph Queue Simulation

hash-map pair recursion memoization dynamic-programming combinatorics

Full post LeetCode Kotlin Telegram

15.07.2023

hard

1751. Maximum Number of Events That Can Be Attended II

Kotlin

Max sum of at most k values from non-intersecting array of (from, to, value) items

Backtracking Queue Heap

events cache dfs search_next sort_by_start_time dfs_with_memoization

Full post LeetCode Kotlin Telegram

26.06.2023

medium

2462. Total Cost to Hire K Workers

Kotlin

The sum of the smallest cost from suffix and prefix of a costs size of candidates in k iterations

Two Pointers Queue Array

priority-queue two-pointers priority-queue-selection array optimization

Full post LeetCode Kotlin Telegram

4.05.2023

medium

649. Dota2 Senate

Kotlin

Use Queue and count how many bans are from the Radiant and from the Dire.

Queue Simulation String

queue array simulation queue_simulation strings

Full post LeetCode Kotlin Telegram

23.02.2023

hard

502. IPO

Kotlin

Sort items by increasing capital. Then, on each step, add all possible deals to the priority queue and take one best from it.

Queue Heap Greedy

heap array greedy sorting optimization

Full post LeetCode Kotlin Telegram

11.01.2023

medium

1443. Minimum Time to Collect All Apples in a Tree

Kotlin

fun minTime(n: Int, edges: Array, hasApple: List): Int {

Graph Tree Queue

graph array queue depth-first-search breadth-first-search cycle-handling

Full post LeetCode Kotlin Telegram

16.12.2022

easy

232. Implement Queue using Stacks

Kotlin

class MyQueue() {

Stack Queue

Stack Queue reversal arrays

Full post LeetCode Kotlin Telegram

21.11.2022

medium

Nearest Exit From Entrance In Maze

fun nearestExit(maze: Array, entrance: IntArray): Int {

Queue Array

maze queue breadth-first-search modifying the input array to mark visited cells maze traversal grid traversal

Full post LeetCode

6.11.2022

hard

Orderly Queue

Kotlin

One idea that come to my mind is: if k >= 2 then you basically can swap any adjacent elements. That means you can actually sort all the characters.

Queue Sorting String

sorting strings

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