func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, a[110][110];   bool equal_row(int i, int k) {     for (int j = 0; j < m; j++)       if (a[i][j] != a[k][j]) return false;     return true;   }   bool can(int from, int mid, int end) {     int i = mid - 1, k = mid;     while (i >= 0 && k < end) {       if (!equal_row(i, k)) return false;       i--, k++;     }     return true;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cin >> n >> m;     for (int i = 0; i < n; i++)       for (int j = 0; j < m; j++) cin >> a[i][j];     if (n & 1)       cout << n <<   n ;     else {       int ans = n;       int end = n;       while (ans % 2 == 0) {         int mid = ans / 2;         if (!can(0, mid, end) || mid == 0) break;         ans = mid;         end = mid;       }       cout << ans <<   n ;     }     return 0;   }   