func_code_string: #include <bits/stdc++.h>   using namespace std;   const inline int __GET_INT() {     int ret;     scanf( %d , &ret);     return ret;   }   const int maxn = 2002;   int n, m;   char grid[maxn][maxn];   int dx[] = {-1, -1, -1, 0, 0, 1, 1, 1};   int dy[] = {-1, 0, 1, -1, 1, -1, 0, 1};   int cntStar(int r, int c) {     return (grid[r][c] ==  * ) + (grid[r + 1][c] ==  * ) +            (grid[r][c + 1] ==  * ) + (grid[r + 1][c + 1] ==  * );   }   void dfs(int r, int c) {     if (r < 0 || c < 0 || (r + 1) >= n || (c + 1) >= m) {       return;     }     if (cntStar(r, c) != 1) {       return;     }     grid[r][c] = grid[r + 1][c] = grid[r][c + 1] = grid[r + 1][c + 1] =  . ;     for (int i = 0; i < 2; ++i)       for (int j = 0; j < 2; ++j) {         for (int k = 0; k < 8; ++k) {           dfs(r + i + dx[k], c + j + dy[k]);         }       }   }   int main() {     n = __GET_INT();     m = __GET_INT();     for (int i = 0; i < n; ++i) {       scanf( %s , grid[i]);     }     for (int i = 0; (i + 1) < n; ++i)       for (int j = 0; (j + 1) < m; ++j) {         dfs(i, j);       }     for (int i = 0; i < n; ++i) {       for (int j = 0; j < m; ++j) printf( %c , grid[i][j]);       puts(  );     }     return 0;   }   