func_code_string: #include <bits/stdc++.h>   using namespace std;   long long i, j, n, t, sum = 0, k, c1 = 1;   int main() {     cin >> n;     vector<string> c(n);     vector<string> s(n);     for (i = 0; i < n; i++) {       cin >> c[i] >> s[i];     }     for (i = 1; i < n; i++) {       k = 0;       for (j = i - 1; j >= 0; j--) {         if (c[i] == c[j] && s[i] == s[j]) {           k++;           if (k != 0) {             break;           }         }       }       if (k == 0) {         c1++;       }     }     cout << c1;   }   