Calculate score of a string consisting of balanced parentheses

Generate all possible combinations of K numbers that sums to N

Rotate all Matrix elements except the diagonal K times by 90 degrees in clockwise direction

Lowest Common Ancestor of the deepest leaves of a Binary Tree

Partition a Linked List into K continuous groups with difference in their sizes at most 1

Lexicographically largest permutation possible by a swap that is smaller than a given array