func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, num, cnt;   int dat[1009][1009], ans[1000009];   bool vis[1009][1009];   int dx[4] = {-1, 0, 1, 0};   int dy[4] = {0, 1, 0, -1};   int wall[4] = {8, 4, 2, 1};   void dfs(int x, int y) {     if (vis[x][y] || x < 0 || x > n || y < 0 || y > m) return;     vis[x][y] = 1;     num++;     for (int i = 0; i < 4; i++) {       if ((dat[x][y] & wall[i]) ||           (dat[x + dx[i]][y + dy[i]] & wall[(i + 2) % 4]))         continue;       dfs(x + dx[i], y + dy[i]);     }   }   int main() {     cin >> n >> m;     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= m; j++) {         cin >> dat[i][j];       }     }     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= m; j++) {         if (!vis[i][j]) {           num = 0;           dfs(i, j);           ans[++cnt] = num;         }       }     }     sort(ans + 1, ans + 1 + cnt);     for (int i = cnt; i > 0; i--) cout << ans[i] <<    ;     return 0;   }   