func_code_string: #include <bits/stdc++.h>   using namespace std;   bool comp(string s, string t, vector<int> rows) {     int i = 0;     int m = s.size();     while (i < m &&            (s[i] == t[i] || (find(rows.begin(), rows.end(), i) != rows.end())))       i++;     if (i == m) return false;     return s[i] < t[i];   }   int main() {     int n, m;     cin >> n >> m;     vector<string> table(n);     for (int i = 0; i < n; i++) cin >> table[i];     vector<int> rows;     for (int j = 0; j < m; j++) {       for (int i = 1; i < n; i++) {         int k = i - 1;         if (comp(table[i], table[k], rows)) {           for (int l = 0; l < m; l++) {             if (find(rows.begin(), rows.end(), l) != rows.end()) continue;             if (table[i][l] < table[k][l]) {               rows.push_back(l);               break;             }           }         }       }     }     cout << rows.size() << endl;     return 0;   }   