func_code_string: #include <bits/stdc++.h>   using namespace std;   int k, n, m;   const int dx[4] = {-1, 1, 0, 0};   const int dy[4] = {0, 0, -1, 1};   int bx, by, s, ansx[1000000], ansy[1000000];   bool g[510][510];   char ansc[1000000];   int dfs(int x, int y) {     if (x > 0 && y > 0 && x <= n && y <= m && g[x][y] == 0) {       g[x][y] = 1;       s++;       ansc[s] =  B ;       ansx[s] = x;       ansy[s] = y;       int nx, ny;       for (int i = 0; i < 4; i++) {         nx = x + dx[i];         ny = y + dy[i];         dfs(nx, ny);       }       if (bx != x || by != y) {         s++;         ansc[s] =  D ;         ansx[s] = x;         ansy[s] = y;         s++;         ansc[s] =  R ;         ansx[s] = x;         ansy[s] = y;       }     }   }   int main() {     cin >> n >> m;     for (int i = 1; i <= n; i++)       for (int j = 1; j <= m; j++) {         char c;         cin >> c;         if (c ==  # ) g[i][j] = true;       }     for (int i = 1; i <= n; i++)       for (int j = 1; j <= m; j++)         if (!g[i][j]) bx = i, by = j, dfs(i, j);     cout << s << endl;     for (int i = 1; i <= s; i++) printf( %c %d %d n , ansc[i], ansx[i], ansy[i]);     return 0;   }   