surrounded专题

【LeetCode】 Surrounded Regions （BFS DFS）

题目：Surrounded Regions 广搜和深搜都能解决，但是LeetCode上使用深搜时会栈溢出 DFS: <span style="font-size:18px;">/*LeetCode Surrounded Regions* 题目：给定一个字符数组，由'X'和'O'组成，找到所有被x包围的o并将其替换为x* 思路：只要替换被包围的o就行，如果有一个o是边界或者上下左右中有一个

Laravel 报错: Dotenv values containing spaces must be surrounded by quotes.

报错信息如下: 原因: .env文件配置中包含空格的配置信息,用双引号""引起来即可。我是在配置项后面添加注释前面有空格，换行后显示正常。

LeetCode 题解（153）: Surrounded Regions

题目： 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 XX O O XX

LeetCode *** 130. Surrounded Regions

题目： 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 XX O O X

Surrounded Regions --leetcode

题目： https://oj.leetcode.com/problems/surrounded-regions/ 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

[LeetCode]130.Surrounded Regions

题目 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 X O O X X X

leetcode----130. Surrounded Regions

链接： https://leetcode.com/problems/surrounded-regions/ 大意：给定一个二维字符数组board，board中每个字符都是'X'或者'O'。现在要求将所有被'X'包围'O'变为'X'。规定：在边界上的'O'默认不被'X'包围。例子：思路：图的DFS。利用DFS，将board的各个边界为'O'以及与其连接的'O'全部变为'#'（

find the largest subsquare surrounded by ‘w’ 和‘W’

一个char[][] board，里面有‘b’'B''w''W'四种，bB都表示black，wW都表示white，找最大的正方形面积，这个正方形四个边都是black，正方形中间随便黑白无所谓。Example：一个5x5的board如下，符合条件最大正方形是个3x3的，return面积9。 wwbww wbbbb bbWbw Bbbbb wwwww 参考：点击打开链接 public sta

[leetcode刷题系列]Surrounded Regions

囧，这题用dfs我re了，应该是爆栈了。于是改成了bfs就过了 const int MAXN = 1000 + 10;const int dx[] = {-1, 0, 0, 1};const int dy[] = {0, -1, 1, 0};int n, m;bool vis[MAXN][MAXN];void bfs(int r, int c, vector<vector<ch

Error: “+“ and “-“ must be surrounded by whitespace in calculations.

加减之前一定要空格改之前：改之后：然后就完美解决啦

leetcode130. Surrounded Regions

题意： 130. Surrounded Regions Medium 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 surrou