func_code_string: #include <bits/stdc++.h>   using namespace std;   int used[1123], used1[1123];   char a[1123][1123];   int main() {     int n, m, i, j;     bool flag = 0;     cin >> n >> m;     for (i = 1; i <= n; i++) {       for (j = 1; j <= m; j++) {         cin >> a[i][j];       }     }     int ans = 0;     for (j = 1; j <= m; j++) {       flag = 0;       for (i = 2; i <= n; i++) {         if (used[i] == 0) {           if (a[i][j] < a[i - 1][j]) {             ans++;             flag = 1;             break;           } else if (a[i][j] > a[i - 1][j]) {             used1[i] = 1;           }         } else {           used1[i] = 1;         }       }       if (flag == 0) {         for (i = 2; i <= n; i++) {           used[i] = used1[i];         }       }       for (i = 2; i <= n; i++) {         used1[i] = 0;       }     }     cout << ans << endl;     return 0;   }   