func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, S[2005];   bool mark[2005][2005];   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     char c;     cin >> n >> m;     for (int i = 1; i <= n; i++)       for (int j = 1; j <= m; j++) {         cin >> c;         mark[i][j] = c -  0 ;         if (mark[i][j]) S[j]++;       }     bool flag;     for (int i = 1; i <= n; i++) {       flag = 0;       for (int j = 1; j <= m; j++)         if (mark[i][j]) S[j]--;       for (int j = 1; j <= m; j++)         if (S[j] == 0) {           flag = 1;           break;         }       if (!flag) {         cout <<  YES ;         return 0;       }       for (int j = 1; j <= m; j++)         if (mark[i][j]) S[j]++;     }     cout <<  NO ;     return 0;   }   