Open the Lock

Partition Labels

Trim a Binary Search Tree BST

Flatten binary tree to linked list in order of preorder traversal

Merge Triplets to Form Target Triplet

Encode and Decode TinyURL

Flip Equivalent Binary Trees

Maximum Product of the Length of Two Palindromic Subsequences

Minimum Difference Between Highest and Lowest of K Scores

Minimum Number of Days to Eat N Oranges