Check if Duplicate Element Exists in an Array
Given an array of integers, check if the array contains any duplicates.
ReadFind Combinations of a List Whose Sum is Equal to a Target
Given a list of distinct integers, find all the possible combinations which sums up to a target.
ReadGenerate Spiral Matrix
Given a positive integer n, generate a square matrix filled with elements from 1 to n^2 in spiral order.
ReadMinimum Remove to Make Valid Parentheses
Given a string, remove minimum number of parentheses to make it balanced.
ReadCheck if a Binary Tree is Balanced or Not
Given root of a binary tree, check if it is balanced or not.
ReadSecond Largest Node in Binary Search Tree
Given the root to a binary search tree, find the second largest node in the tree.
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