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QuestionGiven a set of candidate numbers (candidates) (without duplicates) and a target number (target), find all unique combinations in candidateswhere the candidate numbers sums to target.The same...

Question:Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows:The left subtree of a node contains only nodes with keys less than the node’s k...

Question:Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent.Example:Input: “23”Output: [“ad”, “ae”, “af”, “bd”, “be”, “bf...

Question:Given a non-empty 2D array gridof 0’s and 1’s, an island is a group of 1’s (representing land) connected 4-directionally (horizontal or vertical.) You may assume all four edges of the grid a...