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Discription Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1:   Input: "babad" Output: "bab" Note: "aba" is also a va...

Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: The solution set must not cont...

Given a sorted array nums, remove the duplicates in-place such that duplicates appeared at mosttwice and return the new length. Do not allocate extra space for another array, you must do this by mod...

33. Search in Rotated Sorted Array Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,1,2,4,5,6,7] might become [4,5,6,7,0,1,2]). You are given...

Given preorder and inorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. For example, given preorder =[3,9,20,15,7] inorder = [9,...

Given inorder and postorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. For example, given inorder =[9,3,15,20,7] postorder = [...

Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [2], ...