Triple digit even numbers from digits #easy #backtrack


https://leetcode.com/problems/finding-3-digit-even-numbers/description

String length after t shifts c=c+1,z=ab #medium #dp



https://leetcode.com/problems/total-characters-in-string-after-transformations-i/description

t steps to convert char into next nums[c] chars #hard #dp #math


https://leetcode.com/problems/total-characters-in-string-after-transformations-ii/description

https://leetcode.com/problems/longest-unequal-adjacent-groups-subsequence-i/description


Longest subsequence alterating g #easy #gready

https://leetcode.com/problems/longest-unequal-adjacent-groups-subsequence-ii/description


Longest subsequence humming distance 1, alterating groups #medium #dp

https://leetcode.com/problems/sort-colors/description


Sort 0,1,2 array #medium #two_pointers

https://leetcode.com/problems/painting-a-grid-with-three-different-colors/description


Ways to 3-color m*n grid, no adjucents #hard #dp #matrix

https://leetcode.com/problems/type-of-triangle/description/

Triangle type by lengths #easy

https://leetcode.com/problems/zero-array-transformation-i/description/


Can intersecting intervals decrease an array #medium #line_sweep

https://leetcode.com/problems/set-matrix-zeroes/description/

Zero-fy rows and columns #medium

https://leetcode.com/problems/zero-array-transformation-iii/description


Max removed queries still zero-fy an array #medium #heap

https://leetcode.com/problems/find-the-maximum-sum-of-node-values/description/

Max sum by k-xoring edges #hard #tree #dp

Indices with x #easy


https://leetcode.com/problems/find-words-containing-character/description/

https://leetcode.com/problems/longest-palindrome-by-concatenating-two-letter-words/description/


2131. Longest Palindrome by Concatenating Two Letter Words

https://leetcode.com/problems/largest-color-value-in-a-directed-graph/description/


Max color freq path #hard #dp #toposort

https://leetcode.com/problems/divisible-and-non-divisible-sums-difference/description/


Sum non-divisible minus sum divisible #easy #math

https://leetcode.com/problems/maximize-the-number-of-target-nodes-after-connecting-trees-i/description/

Max k-reacheable nodes of merged trees #medium #dfs

Max even-edged siblings after merging trees #hard #graph


https://leetcode.com/problems/maximize-the-number-of-target-nodes-after-connecting-trees-ii/description

https://leetcode.com/problems/find-closest-node-to-given-two-nodes/description


Closest common node #medium #bfs

https://leetcode.com/problems/snakes-and-ladders/description/


Shortest path bottom-top in zig-zag matrix with jumps #medium #bfs

https://leetcode.com/problems/distribute-candies-among-children-ii/description/


Ways to give limited from n candies to 3 kids #medium #math #combinations