Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in pla…

题意：给你一个非负数c，判断该数是不是两个完全平方数的和（a^2 + b^2） = c. 解题思路： 思路一：暴力。筛选a，b：a^2 <= c, b ^2 <= c，然后组合a^2 + b^2与c比较，时间…

题目 Given a string, you need to reverse the order of characters in each word within a sentence while still pres…

  Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest…

  Implement a MyCalendarTwo class to store your events. A new event can be added if adding the …

Binary Tree Level Order Traversal Given a binary tree, return the level order traversal of its nodes…

Search in Rotated Sorted Array I Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i…

题目地址：https://leetcode-cn.com/probl…题目描述：给定一个二叉树，在树的最后一行找到最左边的值。 示例 1: 输入: 2 / \ 1 3 输出:1 示例 2: 输入: 1 / \…

leetCode-15. 3Sum-Medium descrition Given an array S of n integers, are there elements a, b, c in S such that …

一、题目 给出一个 32 位的有符号整数，你需要将这个整数中每位上的数字进行反转。 示例 1: 输入: 123 输出: 321 示例 2: 输入: -123 输出: -321 示例 3: 输入: 120 输出: 21 注…

描述 Given an array nums, write a function to move all 0’s to the end of it while maintaining the relative…

  Given a positive integer, return its corresponding column title as appear in an Excel sheet. For exampl…