This is a personal blog. Mail me if you want to use materials from it. https://dmitrysamoylenko.com/leetcode/ Max dist when replace with L or R https://dmitrysamoylenko.com/leetcode/problem/2026-04-24-2833-furthest-point-from-origin/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-24-2833-furthest-point-from-origin/ Fri, 24 Apr 2026 00:00:00 +0000 Sum of distances to each occurance https://dmitrysamoylenko.com/leetcode/problem/2026-04-23-2615-sum-of-distances/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-23-2615-sum-of-distances/ Thu, 23 Apr 2026 00:00:00 +0000 Words in dictionary with 2 edits https://dmitrysamoylenko.com/leetcode/problem/2026-04-22-2452-words-within-two-edits-of-dictionary/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-22-2452-words-within-two-edits-of-dictionary/ Wed, 22 Apr 2026 00:00:00 +0000 Diff src vs target after rearrange by rules https://dmitrysamoylenko.com/leetcode/problem/2026-04-21-1722-minimize-hamming-distance-after-swap-operations/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-21-1722-minimize-hamming-distance-after-swap-operations/ Tue, 21 Apr 2026 00:00:00 +0000 Max distance between different numbers https://dmitrysamoylenko.com/leetcode/problem/2026-04-20-2078-two-furthest-houses-with-different-colors/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-20-2078-two-furthest-houses-with-different-colors/ Mon, 20 Apr 2026 00:00:00 +0000 Max distance a[i] not greater than b[j] window https://dmitrysamoylenko.com/leetcode/problem/2026-04-19-1855-maximum-distance-between-a-pair-of-values/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-19-1855-maximum-distance-between-a-pair-of-values/ Sun, 19 Apr 2026 00:00:00 +0000 Diff with reversal https://dmitrysamoylenko.com/leetcode/problem/2026-04-18-3783-mirror-distance-of-an-integer/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-18-3783-mirror-distance-of-an-integer/ Sat, 18 Apr 2026 00:00:00 +0000 Distance to prev mirror number https://dmitrysamoylenko.com/leetcode/problem/2026-04-17-3761-minimum-absolute-distance-between-mirror-pairs/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-17-3761-minimum-absolute-distance-between-mirror-pairs/ Fri, 17 Apr 2026 00:00:00 +0000 Shortest distances to the same values https://dmitrysamoylenko.com/leetcode/problem/2026-04-16-3488-closest-equal-element-queries/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-16-3488-closest-equal-element-queries/ Thu, 16 Apr 2026 00:00:00 +0000 Distance to target https://dmitrysamoylenko.com/leetcode/problem/2026-04-15-2515-shortest-distance-to-target-string-in-a-circular-array/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-15-2515-shortest-distance-to-target-string-in-a-circular-array/ Wed, 15 Apr 2026 00:00:00 +0000 Shortest distances to travel robots to factories https://dmitrysamoylenko.com/leetcode/problem/2026-04-14-2463-minimum-total-distance-traveled/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-14-2463-minimum-total-distance-traveled/ Tue, 14 Apr 2026 00:00:00 +0000 Distance to target from start https://dmitrysamoylenko.com/leetcode/problem/2026-04-13-1848-minimum-distance-to-the-target-element/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-13-1848-minimum-distance-to-the-target-element/ Mon, 13 Apr 2026 00:00:00 +0000 Min travel on keyboard to type a word https://dmitrysamoylenko.com/leetcode/problem/2026-04-12-1320-minimum-distance-to-type-a-word-using-two-fingers/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-12-1320-minimum-distance-to-type-a-word-using-two-fingers/ Sun, 12 Apr 2026 00:00:00 +0000 Min sum of distances between i,j,k of the same values https://dmitrysamoylenko.com/leetcode/problem/2026-04-11-3741-minimum-distance-between-three-equal-elements-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-11-3741-minimum-distance-between-three-equal-elements-ii/ Sat, 11 Apr 2026 00:00:00 +0000 Min sum of distances between i,j,k of the same values https://dmitrysamoylenko.com/leetcode/problem/2026-04-10-3740-minimum-distance-between-three-equal-elements-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-10-3740-minimum-distance-between-three-equal-elements-i/ Fri, 10 Apr 2026 00:00:00 +0000 Run stepped multiplication queries https://dmitrysamoylenko.com/leetcode/problem/2026-04-09-3655-xor-after-range-multiplication-queries-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-09-3655-xor-after-range-multiplication-queries-ii/ Thu, 09 Apr 2026 00:00:00 +0000 Run queries https://dmitrysamoylenko.com/leetcode/problem/2026-04-08-3653-xor-after-range-multiplication-queries-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-08-3653-xor-after-range-multiplication-queries-i/ Wed, 08 Apr 2026 00:00:00 +0000 Implement perimeter-robot https://dmitrysamoylenko.com/leetcode/problem/2026-04-07-2069-walking-robot-simulation-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-07-2069-walking-robot-simulation-ii/ Tue, 07 Apr 2026 00:00:00 +0000 Farthest robot movement https://dmitrysamoylenko.com/leetcode/problem/2026-04-06-874-walking-robot-simulation/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-06-874-walking-robot-simulation/ Mon, 06 Apr 2026 00:00:00 +0000 R,L,U,D return to 0 in XY plane https://dmitrysamoylenko.com/leetcode/problem/2026-04-05-657-robot-return-to-origin/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-05-657-robot-return-to-origin/ Sun, 05 Apr 2026 00:00:00 +0000 Decode row-encoded string https://dmitrysamoylenko.com/leetcode/problem/2026-04-04-2075-decode-the-slanted-ciphertext/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-04-2075-decode-the-slanted-ciphertext/ Sat, 04 Apr 2026 00:00:00 +0000 Max walls hit, each robot shoot left or right https://dmitrysamoylenko.com/leetcode/problem/2026-04-03-3661-maximum-walls-destroyed-by-robots/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-03-3661-maximum-walls-destroyed-by-robots/ Fri, 03 Apr 2026 00:00:00 +0000 Max sum path, 2 skips allowed https://dmitrysamoylenko.com/leetcode/problem/2026-04-02-3418-maximum-amount-of-money-robot-can-earn/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-02-3418-maximum-amount-of-money-robot-can-earn/ Thu, 02 Apr 2026 00:00:00 +0000 Collide LR robots https://dmitrysamoylenko.com/leetcode/problem/2026-04-01-2751-robot-collisions/ https://dmitrysamoylenko.com/leetcode/problem/2026-04-01-2751-robot-collisions/ Wed, 01 Apr 2026 00:00:00 +0000 String from pattern matches https://dmitrysamoylenko.com/leetcode/problem/2026-03-31-3474-lexicographically-smallest-generated-string/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-31-3474-lexicographically-smallest-generated-string/ Tue, 31 Mar 2026 00:00:00 +0000 Strings equal at odd-even positions https://dmitrysamoylenko.com/leetcode/problem/2026-03-30-2840-check-if-strings-can-be-made-equal-with-operations-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-30-2840-check-if-strings-can-be-made-equal-with-operations-ii/ Mon, 30 Mar 2026 00:00:00 +0000 Match a and b at (0|2,1|3) positions https://dmitrysamoylenko.com/leetcode/problem/2026-03-29-2839-check-if-strings-can-be-made-equal-with-operations-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-29-2839-check-if-strings-can-be-made-equal-with-operations-i/ Sun, 29 Mar 2026 00:00:00 +0000 Build string from longest common prefixes matrix https://dmitrysamoylenko.com/leetcode/problem/2026-03-28-2573-find-the-string-with-lcp/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-28-2573-find-the-string-with-lcp/ Sat, 28 Mar 2026 00:00:00 +0000 Shift rows k times left and right https://dmitrysamoylenko.com/leetcode/problem/2026-03-27-2946-matrix-similarity-after-cyclic-shifts/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-27-2946-matrix-similarity-after-cyclic-shifts/ Fri, 27 Mar 2026 00:00:00 +0000 Cut matrix in half sums, can remove one cell https://dmitrysamoylenko.com/leetcode/problem/2026-03-26-3548-equal-sum-grid-partition-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-26-3548-equal-sum-grid-partition-ii/ Thu, 26 Mar 2026 00:00:00 +0000 Split matrix to equal sums https://dmitrysamoylenko.com/leetcode/problem/2026-03-25-3546-equal-sum-grid-partition-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-25-3546-equal-sum-grid-partition-i/ Wed, 25 Mar 2026 00:00:00 +0000 Product of other cells in a matrix https://dmitrysamoylenko.com/leetcode/problem/2026-03-24-2906-construct-product-matrix/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-24-2906-construct-product-matrix/ Tue, 24 Mar 2026 00:00:00 +0000 Max product path right-down https://dmitrysamoylenko.com/leetcode/problem/2026-03-23-1594-maximum-non-negative-product-in-a-matrix/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-23-1594-maximum-non-negative-product-in-a-matrix/ Mon, 23 Mar 2026 00:00:00 +0000 Rotate matrix https://dmitrysamoylenko.com/leetcode/problem/2026-03-22-1886-determine-whether-matrix-can-be-obtained-by-rotation/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-22-1886-determine-whether-matrix-can-be-obtained-by-rotation/ Sun, 22 Mar 2026 00:00:00 +0000 Reverse submatrix k by k https://dmitrysamoylenko.com/leetcode/problem/2026-03-21-3643-flip-square-submatrix-vertically/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-21-3643-flip-square-submatrix-vertically/ Sat, 21 Mar 2026 00:00:00 +0000 Mid diffs in k k submatrices https://dmitrysamoylenko.com/leetcode/problem/2026-03-20-3567-minimum-absolute-difference-in-sliding-submatrix/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-20-3567-minimum-absolute-difference-in-sliding-submatrix/ Fri, 20 Mar 2026 00:00:00 +0000 Count prefix freq X == freq Y https://dmitrysamoylenko.com/leetcode/problem/2026-03-19-3212-count-submatrices-with-equal-frequency-of-x-and-y/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-19-3212-count-submatrices-with-equal-frequency-of-x-and-y/ Thu, 19 Mar 2026 00:00:00 +0000 Count prefix sums less than K https://dmitrysamoylenko.com/leetcode/problem/2026-03-18-3070-count-submatrices-with-top-left-element-and-sum-less-than-k/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-18-3070-count-submatrices-with-top-left-element-and-sum-less-than-k/ Wed, 18 Mar 2026 00:00:00 +0000 Max area of binary matrix, swap columns https://dmitrysamoylenko.com/leetcode/problem/2026-03-17-1727-largest-submatrix-with-rearrangements/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-17-1727-largest-submatrix-with-rearrangements/ Tue, 17 Mar 2026 00:00:00 +0000 Top 3 rhombus sums https://dmitrysamoylenko.com/leetcode/problem/2026-03-16-1878-get-biggest-three-rhombus-sums-in-a-grid/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-16-1878-get-biggest-three-rhombus-sums-in-a-grid/ Mon, 16 Mar 2026 00:00:00 +0000 Design: add number, mulriply all, add all https://dmitrysamoylenko.com/leetcode/problem/2026-03-15-1622-fancy-sequence/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-15-1622-fancy-sequence/ Sun, 15 Mar 2026 00:00:00 +0000 K-th generated abc non-repeating string https://dmitrysamoylenko.com/leetcode/problem/2026-03-14-1415-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-14-1415-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n/ Sat, 14 Mar 2026 00:00:00 +0000 Min steps to work a mountain with arithmetic-sum-workers https://dmitrysamoylenko.com/leetcode/problem/2026-03-13-3296-minimum-number-of-seconds-to-make-mountain-height-zero/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-13-3296-minimum-number-of-seconds-to-make-mountain-height-zero/ Fri, 13 Mar 2026 00:00:00 +0000 Max of min values in span tree of graph, 2 s at most k https://dmitrysamoylenko.com/leetcode/problem/2026-03-12-3600-maximize-spanning-tree-stability-with-upgrades/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-12-3600-maximize-spanning-tree-stability-with-upgrades/ Thu, 12 Mar 2026 00:00:00 +0000 Invert binary https://dmitrysamoylenko.com/leetcode/problem/2026-03-11-1009-complement-of-base-10-integer/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-11-1009-complement-of-base-10-integer/ Wed, 11 Mar 2026 00:00:00 +0000 array to make with z zeros, o ones, l repeats https://dmitrysamoylenko.com/leetcode/problem/2026-03-10-3130-find-all-possible-stable-binary-arrays-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-10-3130-find-all-possible-stable-binary-arrays-ii/ Tue, 10 Mar 2026 00:00:00 +0000 Count 01-arrays with z zeros, o ones, at most l repeat https://dmitrysamoylenko.com/leetcode/problem/2026-03-09-3129-find-all-possible-stable-binary-arrays-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-09-3129-find-all-possible-stable-binary-arrays-i/ Mon, 09 Mar 2026 00:00:00 +0000 Uniq bits not in a set https://dmitrysamoylenko.com/leetcode/problem/2026-03-08-1980-find-unique-binary-string/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-08-1980-find-unique-binary-string/ Sun, 08 Mar 2026 00:00:00 +0000 Min flips to make 01 alterating string sum window https://dmitrysamoylenko.com/leetcode/problem/2026-03-07-1888-minimum-number-of-flips-to-make-the-binary-string-alternating/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-07-1888-minimum-number-of-flips-to-make-the-binary-string-alternating/ Sat, 07 Mar 2026 00:00:00 +0000 +0 pattern https://dmitrysamoylenko.com/leetcode/problem/2026-03-06-1784-check-if-binary-string-has-at-most-one-segment-of-ones/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-06-1784-check-if-binary-string-has-at-most-one-segment-of-ones/ Fri, 06 Mar 2026 00:00:00 +0000 Min flips to make bits alterating https://dmitrysamoylenko.com/leetcode/problem/2026-03-05-1758-minimum-changes-to-make-alternating-binary-string/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-05-1758-minimum-changes-to-make-alternating-binary-string/ Thu, 05 Mar 2026 00:00:00 +0000 Count single 1-row-column https://dmitrysamoylenko.com/leetcode/problem/2026-08-04-1582-special-positions-in-a-binary-matrix/ https://dmitrysamoylenko.com/leetcode/problem/2026-08-04-1582-special-positions-in-a-binary-matrix/ Tue, 04 Aug 2026 00:00:00 +0000 Kth bit in s=s+1+inv(rev(s)) sequence https://dmitrysamoylenko.com/leetcode/problem/2026-03-03-1545-find-kth-bit-in-nth-binary-string/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-03-1545-find-kth-bit-in-nth-binary-string/ Tue, 03 Mar 2026 00:00:00 +0000 Min rows swaps to zero above diagonal https://dmitrysamoylenko.com/leetcode/problem/2026-03-02-1536-minimum-swaps-to-arrange-a-binary-grid/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-02-1536-minimum-swaps-to-arrange-a-binary-grid/ Mon, 02 Mar 2026 00:00:00 +0000 Min 01-strings add up to target https://dmitrysamoylenko.com/leetcode/problem/2026-03-01-1689-partitioning-into-minimum-number-of-deci-binary-numbers/ https://dmitrysamoylenko.com/leetcode/problem/2026-03-01-1689-partitioning-into-minimum-number-of-deci-binary-numbers/ Sun, 01 Mar 2026 00:00:00 +0000 Concat binaries 1..n https://dmitrysamoylenko.com/leetcode/problem/2026-02-28-1680-concatenation-of-consecutive-binary-numbers/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-28-1680-concatenation-of-consecutive-binary-numbers/ Sat, 28 Feb 2026 00:00:00 +0000 Min steps to convert 01 stirng to ones flipping K https://dmitrysamoylenko.com/leetcode/problem/2026-02-27-3666-minimum-operations-to-equalize-binary-string/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-27-3666-minimum-operations-to-equalize-binary-string/ Fri, 27 Feb 2026 00:00:00 +0000 Ops /2+1 to make 1 https://dmitrysamoylenko.com/leetcode/problem/2026-02-26-1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-26-1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one/ Thu, 26 Feb 2026 00:00:00 +0000 Sort https://dmitrysamoylenko.com/leetcode/problem/2026-02-25-1356-sort-integers-by-the-number-of-1-bits/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-25-1356-sort-integers-by-the-number-of-1-bits/ Wed, 25 Feb 2026 00:00:00 +0000 Sum of a binary numbers in a binary tree https://dmitrysamoylenko.com/leetcode/problem/2026-02-24-1022-sum-of-root-to-leaf-binary-numbers/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-24-1022-sum-of-root-to-leaf-binary-numbers/ Tue, 24 Feb 2026 00:00:00 +0000 All numbers as substring length of k window https://dmitrysamoylenko.com/leetcode/problem/2026-02-23-1461-check-if-a-string-contains-all-binary-codes-of-size-k/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-23-1461-check-if-a-string-contains-all-binary-codes-of-size-k/ Mon, 23 Feb 2026 00:00:00 +0000 Distance between onces in a binary https://dmitrysamoylenko.com/leetcode/problem/2026-02-22-868-binary-gap/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-22-868-binary-gap/ Sun, 22 Feb 2026 00:00:00 +0000 Number in l..r with prime bits count https://dmitrysamoylenko.com/leetcode/problem/2026-02-21-762-prime-number-of-set-bits-in-binary-representation/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-21-762-prime-number-of-set-bits-in-binary-representation/ Sat, 21 Feb 2026 00:00:00 +0000 Swaps of 1M0-special substring to make string large https://dmitrysamoylenko.com/leetcode/problem/2026-02-20-761-special-binary-string/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-20-761-special-binary-string/ Fri, 20 Feb 2026 00:00:00 +0000 Count substrings of 01 and 10 window https://dmitrysamoylenko.com/leetcode/problem/2026-02-19-696-count-binary-substrings/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-19-696-count-binary-substrings/ Thu, 19 Feb 2026 00:00:00 +0000 Alternating bits https://dmitrysamoylenko.com/leetcode/problem/2026-02-18-693-binary-number-with-alternating-bits/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-18-693-binary-number-with-alternating-bits/ Wed, 18 Feb 2026 00:00:00 +0000 All times with count bits set https://dmitrysamoylenko.com/leetcode/problem/2026-02-17-401-binary-watch/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-17-401-binary-watch/ Tue, 17 Feb 2026 00:00:00 +0000 Reverse bits https://dmitrysamoylenko.com/leetcode/problem/2026-02-16-190-reverse-bits/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-16-190-reverse-bits/ Mon, 16 Feb 2026 00:00:00 +0000 Binary strings sum https://dmitrysamoylenko.com/leetcode/problem/2026-02-15-67-add-binary/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-15-67-add-binary/ Sun, 15 Feb 2026 00:00:00 +0000 Flow in a Pascal's Triangle https://dmitrysamoylenko.com/leetcode/problem/2026-02-14-799-champagne-tower/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-14-799-champagne-tower/ Sat, 14 Feb 2026 00:00:00 +0000 Largest equal frequencies substring of abc-string https://dmitrysamoylenko.com/leetcode/problem/2026-02-13-3714-longest-balanced-substring-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-13-3714-longest-balanced-substring-ii/ Fri, 13 Feb 2026 00:00:00 +0000 Max substring with equal frequencies window https://dmitrysamoylenko.com/leetcode/problem/2026-02-12-3713-longest-balanced-substring-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-12-3713-longest-balanced-substring-i/ Thu, 12 Feb 2026 00:00:00 +0000 Max subarray evens count = odds count tree https://dmitrysamoylenko.com/leetcode/problem/2026-02-11-3721-longest-balanced-subarray-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-11-3721-longest-balanced-subarray-ii/ Wed, 11 Feb 2026 00:00:00 +0000 Longes even=odd subarray https://dmitrysamoylenko.com/leetcode/problem/2026-02-10-3719-longest-balanced-subarray-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-10-3719-longest-balanced-subarray-i/ Tue, 10 Feb 2026 00:00:00 +0000 Balance binary search tree https://dmitrysamoylenko.com/leetcode/problem/2026-02-09-1382-balance-a-binary-search-tree/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-09-1382-balance-a-binary-search-tree/ Mon, 09 Feb 2026 00:00:00 +0000 Is tree balanced? https://dmitrysamoylenko.com/leetcode/problem/2026-02-08-110-balanced-binary-tree/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-08-110-balanced-binary-tree/ Sun, 08 Feb 2026 00:00:00 +0000 Min removal to balance 'ab' https://dmitrysamoylenko.com/leetcode/problem/2026-02-07-1653-minimum-deletions-to-make-string-balanced/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-07-1653-minimum-deletions-to-make-string-balanced/ Sat, 07 Feb 2026 00:00:00 +0000 Min removals to make min k not less than max window https://dmitrysamoylenko.com/leetcode/problem/2026-02-06-3634-minimum-removals-to-balance-array/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-06-3634-minimum-removals-to-balance-array/ Fri, 06 Feb 2026 00:00:00 +0000 Shuffled list i+n[i] https://dmitrysamoylenko.com/leetcode/problem/2026-02-05-3379-transformed-array/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-05-3379-transformed-array/ Thu, 05 Feb 2026 00:00:00 +0000 Validate inc,dec,inc sequency https://dmitrysamoylenko.com/leetcode/problem/2026-02-03-3637-trionic-array-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-03-3637-trionic-array-i/ Tue, 03 Feb 2026 00:00:00 +0000 Min sum of k splits at max d distance window https://dmitrysamoylenko.com/leetcode/problem/2026-02-02-3013-divide-an-array-into-subarrays-with-minimum-cost-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-02-3013-divide-an-array-into-subarrays-with-minimum-cost-ii/ Mon, 02 Feb 2026 00:00:00 +0000 Split on 2 min values https://dmitrysamoylenko.com/leetcode/problem/2026-02-01-3010-divide-an-array-into-subarrays-with-minimum-cost-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-02-01-3010-divide-an-array-into-subarrays-with-minimum-cost-i/ Sun, 01 Feb 2026 00:00:00 +0000 Larger letter in array https://dmitrysamoylenko.com/leetcode/problem/2026-01-31-744-find-smallest-letter-greater-than-target/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-31-744-find-smallest-letter-greater-than-target/ Sat, 31 Jan 2026 00:00:00 +0000 Min cost to convert string with transitions of substrings https://dmitrysamoylenko.com/leetcode/problem/2026-01-30-2977-minimum-cost-to-convert-string-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-30-2977-minimum-cost-to-convert-string-ii/ Fri, 30 Jan 2026 00:00:00 +0000 Min cost to convert string https://dmitrysamoylenko.com/leetcode/problem/2026-01-29-2976-minimum-cost-to-convert-string-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-29-2976-minimum-cost-to-convert-string-i/ Thu, 29 Jan 2026 00:00:00 +0000 Min cost to walk 2D grid with free teleports https://dmitrysamoylenko.com/leetcode/problem/2026-01-28-3651-minimum-cost-path-with-teleportations/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-28-3651-minimum-cost-path-with-teleportations/ Wed, 28 Jan 2026 00:00:00 +0000 Min path in weighted graph with reverse 2w nodes https://dmitrysamoylenko.com/leetcode/problem/2026-01-27-3650-minimum-cost-path-with-edge-reversals/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-27-3650-minimum-cost-path-with-edge-reversals/ Tue, 27 Jan 2026 00:00:00 +0000 Min diff pairs https://dmitrysamoylenko.com/leetcode/problem/2026-01-26-1200-minimum-absolute-difference/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-26-1200-minimum-absolute-difference/ Mon, 26 Jan 2026 00:00:00 +0000 Min k-diff window https://dmitrysamoylenko.com/leetcode/problem/2026-01-25-1984-minimum-difference-between-highest-and-lowest-of-k-scores/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-25-1984-minimum-difference-between-highest-and-lowest-of-k-scores/ Sun, 25 Jan 2026 00:00:00 +0000 Min max pair https://dmitrysamoylenko.com/leetcode/problem/2026-01-24-1877-minimize-maximum-pair-sum-in-array/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-24-1877-minimize-maximum-pair-sum-in-array/ Sat, 24 Jan 2026 00:00:00 +0000 Sort by removing min-sum pairs https://dmitrysamoylenko.com/leetcode/problem/2026-01-23-3510-minimum-pair-removal-to-sort-array-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-23-3510-minimum-pair-removal-to-sort-array-ii/ Fri, 23 Jan 2026 00:00:00 +0000 Sort by removing lowest sum pairs https://dmitrysamoylenko.com/leetcode/problem/2026-01-22-3507-minimum-pair-removal-to-sort-array-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-22-3507-minimum-pair-removal-to-sort-array-i/ Thu, 22 Jan 2026 00:00:00 +0000 Reverse operation x or (x+1) https://dmitrysamoylenko.com/leetcode/problem/2026-01-21-3315-construct-the-minimum-bitwise-array-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-21-3315-construct-the-minimum-bitwise-array-ii/ Wed, 21 Jan 2026 00:00:00 +0000 Reverse x | (x+1) operation on prime numbers https://dmitrysamoylenko.com/leetcode/problem/2026-01-20-3314-construct-the-minimum-bitwise-array-i/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-20-3314-construct-the-minimum-bitwise-array-i/ Tue, 20 Jan 2026 00:00:00 +0000 Max square with sum less than threshold https://dmitrysamoylenko.com/leetcode/problem/2025-01-19-1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold/ https://dmitrysamoylenko.com/leetcode/problem/2025-01-19-1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold/ Sun, 19 Jan 2025 00:00:00 +0000 Max magic square https://dmitrysamoylenko.com/leetcode/problem/2026-01-18-1895-largest-magic-square/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-18-1895-largest-magic-square/ Sun, 18 Jan 2026 00:00:00 +0000 Max square in intersection https://dmitrysamoylenko.com/leetcode/problem/2026-01-17-3047-find-the-largest-area-of-square-inside-two-rectangles/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-17-3047-find-the-largest-area-of-square-inside-two-rectangles/ Sat, 17 Jan 2026 00:00:00 +0000 Max square after remove vertical or horizontal bars https://dmitrysamoylenko.com/leetcode/problem/2026-01-16-2975-maximum-square-area-by-removing-fences-from-a-field/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-16-2975-maximum-square-area-by-removing-fences-from-a-field/ Fri, 16 Jan 2026 00:00:00 +0000 Max square area after removing bars in a grid https://dmitrysamoylenko.com/leetcode/problem/2026-01-15-2943-maximize-area-of-square-hole-in-grid/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-15-2943-maximize-area-of-square-hole-in-grid/ Thu, 15 Jan 2026 00:00:00 +0000 Min y to equal split areas exclude intersections sweep https://dmitrysamoylenko.com/leetcode/problem/2026-01-14-3454-separate-squares-ii/ https://dmitrysamoylenko.com/leetcode/problem/2026-01-14-3454-separate-squares-ii/ Wed, 14 Jan 2026 00:00:00 +0000