思路: 多个起点的bfs. 实现: class Solution { public: vector<vector<int>> updateMatrix(vector<vector<int>>& matrix) { ].size(); vector<vector<)); vector<vector<int>> d(n, vector<int>(m, 0x3f3f3f3f)); queue<pair&…

01 Matrix 题解 原创文章,拒绝转载 题目来源:https://leetcode.com/problems/01-matrix/description/ Description Given a matrix consists of 0 and 1, find the distance of the nearest 0 for each cell. The distance between two adjacent cells is 1. Example 1: Input: 0 0 0 0…

01 Matrix Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 564    Accepted Submission(s): 121 Problem Description It's really a simple problem.  Given a "01" matrix with size by n*n (the ma…

给予一个矩阵,矩阵有1有0,计算每一个1到0需要走几步,只能走上下左右. 解法一: 利用dp,从左上角遍历一遍,再从右下角遍历一遍,dp存储当前位置到0的最短距离. 十分粗心的搞错了col和row,改了半天………… Runtime: 132 ms, faster than 98.88% of C++ online submissions for 01 Matrix. class Solution { public: vector<vector<int>> updateMatrix(…

542. 01 Matrix https://www.cnblogs.com/grandyang/p/6602288.html 将所有的1置为INT_MAX,然后用所有的0去更新原本位置为1的值. 最短距离肯定使用bfs. 每次更新了值的地方还要再加入队列中 . class Solution { public: vector<vector<int>> updateMatrix(vector<vector<int>>& matrix) { ].size…

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 605    Accepted Submission(s): 127 Problem Description It's really a simple problem.  Given a "01" matrix with size by n*n (the matrix size…

[LeetCode]01 Matrix 解题报告 标签(空格分隔): LeetCode 题目地址:https://leetcode.com/problems/01-matrix/#/description 题目描述: Given a matrix consists of 0 and 1, find the distance of the nearest 0 for each cell. The distance between two adjacent cells is 1. Example:…

Given a matrix consists of 0 and 1, find the distance of the nearest 0 for each cell. The distance between two adjacent cells is 1. Example 1: Input: 0 0 0 0 1 0 0 0 0 Output: 0 0 0 0 1 0 0 0 0  Example 2: Input: 0 0 0 0 1 0 1 1 1 Output: 0 0 0 0 1 0…

题意 # 思路 我一开始的时候想的是嘴 # 实现 ```cpp // // include "../PreLoad.h" class Solution { public: /** * 三重循环,最外层为所有1的结点,里面两层是实现BFS * 导致时间复杂度过高,待优化 * @param matrix * @return */ vector< vector<int>> layouts = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}}; ve…

输入:只包含0,1的矩阵 输出:元素1到达最近0的距离 算法思想:广度优先搜索. 元素为0为可达区域,元素为1为不可达区域,我们的目标是为了从可达区域不断地扩展至不可达区域,在扩展的过程中,也就计算出了这些不可达区域到达最近可达区域的距离. 每个可达元素都记录了到当前位置的距离,因此在后续的遍历中,如果是经由当前节点到达的下一节点,这个距离会被累加. #include <iostream> #include <vector> #include <queue> using…

Given a matrix consists of 0 and 1, find the distance of the nearest 0 for each cell. The distance between two adjacent cells is 1. Example 1: Input: 0 0 0 0 1 0 0 0 0 Output: 0 0 0 0 1 0 0 0 0 Example 2: Input: 0 0 0 0 1 0 1 1 1 Output: 0 0 0 0 1 0…

问题: https://leetcode.com/problems/01-matrix/#/description 基本思路:广度优先遍历,根据所有最短距离为N的格找到所有距离为N+1的格,直到所有的格都找到了最短距离. 具体步骤: 首先初始化矩阵,值为0的格其最短距离也是0,保持不变:值为1的格是后面需要计算最短距离的格,我们需要一个整数来标识它们,这里可以选择一个负数或者整数的最大值. 然后进行若干轮计算,第N轮会根据已经计算出的最短距离为N-1的所有格,来找出所有最短距离为N的格. 例如,…

class Solution { public: vector<vector<int>> res; int m, n; vector<vector<int>> updateMatrix(vector<vector<int>>& matrix) { m = matrix.size(); ) return res; n = matrix[].size(); ) return res; res = vector<vector&…

给定一个由 0 和 1 组成的矩阵,找出每个元素到最近的 0 的距离.两个相邻元素间的距离为 1 .示例 1:输入:0 0 00 1 00 0 0输出:0 0 00 1 00 0 0 示例 2:输入:0 0 00 1 01 1 1输出:0 0 00 1 01 2 1注意:    1.给定矩阵的元素个数不超过 10000.    2.给定矩阵中至少有一个元素是 0.    3.矩阵中的元素只在四个方向上相邻: 上.下.左.右.详见:https://leetcode.com/problems/01-…

给定一个由 0 和 1 组成的矩阵,找出每个元素到最近的 0 的距离. 两个相邻元素间的距离为 1 . 示例 1: 输入: 0 0 0 0 1 0 0 0 0 输出: 0 0 0 0 1 0 0 0 0 示例 2: 输入: 0 0 0 0 1 0 1 1 1 输出: 0 0 0 0 1 0 1 2 1 注意: 给定矩阵的元素个数不超过 10000. 给定矩阵中至少有一个元素是 0. 矩阵中的元素只在四个方向上相邻: 上.下.左.右. /* 算法思想: 首先遍历一次矩阵,将值为0的点都存入queu…

#include<stdio.h> #include<string.h> #include<iostream> #include<algorithm> #include<math.h> #include<map> #include<queue> using namespace std; +; char s[maxn][maxn]; int n,m; int c[maxn][maxn]; *maxn][*maxn]; int…

Given a 01 matrix M, find the longest line of consecutive one in the matrix. The line could be horizontal, vertical, diagonal or anti-diagonal. Example: Input: [[0,1,1,0], [0,1,1,0], [0,0,0,1]] Output: 3 Hint: The number of elements in the given matr…

Given a 01 matrix M, find the longest line of consecutive one in the matrix. The line could be horizontal, vertical, diagonal or anti-diagonal. Example: Input: [[0,1,1,0], [0,1,1,0], [0,0,0,1]] Output: 3 Hint: The number of elements in the given matr…

Leetcode 542:01 矩阵 01 Matrix### 题目: 给定一个由 0 和 1 组成的矩阵,找出每个元素到最近的 0 的距离. 两个相邻元素间的距离为 1 . Given a matrix consists of 0 and 1, find the distance of the nearest 0 for each cell. The distance between two adjacent cells is 1. 示例 1: 输入: 0 0 0 0 1 0 0 0 0 输出…

Given a 01 matrix, find the longest line of consecutive 1 in the matrix. The line could be horizontal, vertical, diagonal or anti-diagonal. Example 1: Input: [[0,1,1,0], [0,1,1,0], [0,0,0,1]] Output: 3 Explanation: (0,1) (1,2) (2,3) Example 2: Input:…

Given a 01 matrix M, find the longest line of consecutive one in the matrix. The line could be horizontal, vertical, diagonal or anti-diagonal. Example: Input: [[0,1,1,0], [0,1,1,0], [0,0,0,1]] Output: 3 Hint: The number of elements in the given matr…

Hihocoder 太阁最新面经算法竞赛18 source: https://hihocoder.com/contest/hihointerview27/problems 题目1 : Big Plus 描述 Given an NxN 01 matrix, find the biggest plus (+) consisting of 1s in the matrix. size 1 plus size 2 plus size 3 plus size 4 plus 1 1 1 1 111 1 1…

463. Island Perimeterhttps://leetcode.com/problems/island-perimeter/就是逐一遍历所有的cell,用分离的cell总的的边数减去重叠的边的数目即可.在查找重叠的边的数目的时候有一点小技巧,就是沿着其中两个方向就好,这种题目都有类似的规律,就是可以沿着上三角或者下三角形的方向来做.一刷一次ac,但是还没开始注意codestyle的问题,需要再刷一遍. class Solution { public: int islandPerime…

一.概述 setShader(Shader shader)中传入的自然是shader对象了,shader类是Android在图形变换中非常重要的一个类.Shader在三维软件中我们称之为着色器,其作用是来给图像着色.它有五个子类,像PathEffect一样,它的每个子类都实现了一种Shader.下面来看看文档中的解释: 子类:BitmapShader, ComposeShader, LinearGradient, RadialGradient, SweepGradient 二.BitmapSha…

Special Fish Problem Description There is a kind of special fish in the East Lake where is closed to campus of Wuhan University. It's hard to say which gender of those fish are, because every fish believes itself as a male, and it may attack one of s…

Special Fish Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 14 Accepted Submission(s): 9   Problem Description There is a kind of special fish in the East Lake where is closed to campus of Wuhan…

一.130  Surrounded Regions(https://leetcode.com/problems/surrounded-regions/description/) 题目: 解法: 这道题的意思是将所有被X包围的O都变为X(边缘的不算),我们可以维护一个队列,先把四周的O的位置放进队列中,并把这个位置的值变为Y.然后每次从队列中拿出一个位置,把这个位置四周为O的位置的值变为Y,再把这个位置放进队列(为什么要先变值再进队列呢?在下一道题中会说).一直到队列为空时,我们就成功地把所有直接…

请点击页面左上角 -> Fork me on Github 或直接访问本项目Github地址:LeetCode Solution by Swift    说明:题目中含有$符号则为付费题目. 如:[Swift]LeetCode156.二叉树的上下颠倒 $ Binary Tree Upside Down 请下拉滚动条查看最新 Weekly Contest!!! Swift LeetCode 目录 | Catalog 序        号 题名Title 难度     Difficulty  两数之…

It's not Floyd Algorithm 时间限制(普通/Java):1000MS/3000MS     运行内存限制:65536KByte   描述 When a directed graph is given, we can solve its transitive closure easily using the well-known Floyd algorithm. But if you're given a transitive closure, can you give a…

突然很想刷刷题,LeetCode是一个不错的选择,忽略了输入输出,更好的突出了算法,省去了不少时间. dalao们发现了任何错误,或是代码无法通过,或是有更好的解法,或是有任何疑问和建议的话,可以在对应的随笔下面评论区留言,我会及时处理,在此谢过了. 过程或许会很漫长,也很痛苦,慢慢来吧. 编号 题名 过题率 难度 1 Two Sum 0.376 Easy 2 Add Two Numbers 0.285 Medium 3 Longest Substring Without Repeating C…