func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long MAXN = 350;   const long long PHI = (long long)998244352;   const long long INF = 0x3f3f3f3f;   const long long LINF = 0x3f3f3f3f3f3f3f3f;   const long long MOD = (long long)998244353;   const long long OVER_FLOW = 0x7fffffff;   const long long LOVER_FLOW = 0x7fffffffffffffff;   long long n;   struct op {     long long x1, y1, x2, y2;   };   long long vis[MAXN][MAXN];   vector<op> res;   string str;   void add(long long x1, long long y1, long long x2, long long y2) {     res.push_back((op){x1, y1, x2, y2});     vis[x2][y2]++;   }   void move(long long x1, long long y1, bool x) {     if (x) {       if (x1 != 1) {         add(x1, y1, 1, y1);       } else {         add(x1, y1, 1, y1 == 1 ? 2 : 1);       }     } else {       if (x1 != 2) {         add(x1, y1, 2, y1);       } else {         add(x1, y1, 2, y1 == 1 ? 2 : 1);       }     }   }   int main() {     ios::sync_with_stdio(false);     long long m;     cin >> n >> m;     for (long long i = 1; i <= n; i++) {       for (long long j = 1; j <= m; j++) {         cin >> str;         for (long long k = str.size() - 1; k >= 0; k--) {           move(i, j, str[k] ==  1 );         }       }     }     for (long long i = 1; i <= 2; i++) {       for (long long j = 2; j <= m; j++) {         while (vis[i][j]) {           add(i, j, i, 1);           vis[i][j]--;         }       }     }     long long cnt = res.size();     memset(vis, 0, sizeof vis);     for (long long i = 1; i <= n; i++) {       for (long long j = 1; j <= m; j++) {         cin >> str;         for (auto k : str) {           move(i, j, k ==  1 );         }       }     }     for (long long i = 1; i <= 2; i++) {       for (long long j = 2; j <= m; j++) {         while (vis[i][j]) {           add(i, j, i, 1);           vis[i][j]--;         }       }     }     cout << res.size() <<   n ;     for (long long i = 0; i < cnt; i++) {       cout << res[i].x1 <<     << res[i].y1 <<     << res[i].x2 <<                << res[i].y2 <<   n ;     }     for (long long i = res.size() - 1; i >= cnt; i--) {       cout << res[i].x2 <<     << res[i].y2 <<     << res[i].x1 <<                << res[i].y1 <<   n ;     }     return 0;   }   