func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int a[102][102];     int b, c, i, j, n, m;     cin >> n >> m;     for (i = 1; i <= n; i++)       for (j = 1; j <= m; j++) cin >> a[i][j];     b = n;     while (b % 2 == 0 && b / 2 != 0) {       c = 0;       for (i = 1; i <= b / 2; i++)         for (j = 1; j <= m; j++)           if (a[i][j] != a[b - i + 1][j]) c = 1;       if (c == 1) break;       b = b / 2;     }     printf( %d n , b);     return 0;   }   