### Validate Binary Search Tree

Link to leetcode problem definition Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as…

Link to leetcode problem definition Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as…

link to leetcode problem definition You are given coins of different denominations and a total amount of money. Write a function to compute…

Link to leedcode problem definition Suppose you have a random list of people standing in a queue. Each person is described by a pair of…

Another interesting leetcode problem that comes up often in Apple and Google interviews. Given a positive integer n, break it into the sum…

Another interesting leetcode problem that comes up often in Apple and Google interviews. Given a positive integer n, break it into the sum…

Nice graph problem from leetcode biweekly contest. As majority of graph problems this one can be solved with Breadth First Search as well…

1447 Simplified fractions Given an integer n, return a list of all simplified fractions between 0 and 1 (exclusive) such that the…

Another mind blowing solution with dynamic programming to LeetCode problem number 26 from 30 day challenge Problem statement: Given a 2D…