摘要：
题目：Given two binary trees, write a function to check if they are equal or not.Two binary trees are considered equal if they are structurally identica... 阅读全文
摘要：
题目：Given a binary tree, return the postorder traversal of its nodes' values.For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3return [3... 阅读全文
摘要：
题目：Given a binary tree, return the preorder traversal of its nodes' values.For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3return [1,... 阅读全文
摘要：
题目：Given a binary tree, return the inorder traversal of its nodes' values.For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3return [1,3... 阅读全文
摘要：
题目：Given two integers n and k, return all possible combinations of k numbers out of 1 ... n.For example,If n = 4 and k = 2, a solution is:[ [2,4], ... 阅读全文
摘要：
题目：There are N children standing in a line. Each child is assigned a rating value. You are giving candies to these children subjected to the followin... 阅读全文
摘要：
题目：Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after rain... 阅读全文
摘要：
题目：Say you have an array for which the ith element is the price of a given stock on day i.Design an algorithm to find the maximum profit. You may com... 阅读全文
摘要：
题目：Say you have an array for which the ith element is the price of a given stock on day i.Design an algorithm to find the maximum profit. You may com... 阅读全文
摘要：
题目：Say you have an array for which the ith element is the price of a given stock on day i.If you were only permitted to complete at most one transact... 阅读全文
摘要：
题目： Find the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, given the array [−2,1,−3,4,−1... 阅读全文
摘要：
题目：Given a string s and a dictionary of words dict, add spaces in s to construct a sentence where each word is a valid dictionary word.Return all suc... 阅读全文