qq_52048593的博客

A - Red and Black #include<iostream> #include<cstring> using namespace std; int w,h; char mp[21][21]; bool vis[21][21]; int startx,starty; int dx[4]={0,0,1,-1}; int dy[4]={1-1,0,0}; int length; void dfs(int x,int y) { if(x<1||x>h||.