Given a 2D board containing 'X' and 'O'(the letter O), capture all regions surrounded by 'X'. A region is captured by flipping all 'O's into 'X's in that surrounded region. Example: X X X X X O O X X X O X X O X X After running your function, the boa…

Given a 2D board containing 'X' and 'O' (the letter O), capture all regions surrounded by 'X'. A region is captured by flipping all 'O's into 'X's in that surrounded region. For example, X X X X X O O X X X O X X O X X After running your function, th…

[139-Word Break(单词拆分)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of one or more dictionary words. For example, given s = "leetcode", di…

[130-Surrounded Regions(围绕区域)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'. A region is captured by flipping all 'O's into 'X's in that surrounded region. For example, X X X X…

[053-Maximum Subarray(最大子数组和)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 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,−1,2,1,−5,4], the contiguous subarr…

[062-Unique Paths(唯一路径)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any point in time. The robot is trying to…

[059-Spiral Matrix II(螺旋矩阵II)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example, Given n = 3, You should return the following matrix: [ [ 1, 2, 3 ], [ 8…

[136-Single Number(仅仅出现一次的数字)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it w…

[075-Sort Colors (颜色排序)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue. Here, we will use th…

[101-Symmetric Tree(对称树)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: 1 / \ 2 2 / \ / \ 3 4 4 3 But the following is…