Simplest Binary Tree Traversal trick for preorder inorder postorder

Longest palindromic substring | Dynamic programming

String permutation algorithm | All permutations of a string

Latency | System Design

Difference Array | Range update in O(1)

Largest rectangle in Histogram | Leetcode #84

Zero Array Transformation III | Leetcode 3362

Total Characters in String After Transformations II | Matrix Exponentiation | Leetcode 3337

Count of Interesting Subarrays | Leetcode 2845