func_code_string: #include <bits/stdc++.h>   using namespace std;   int i, j, n, c, d;   string a[105], b[105];   int main() {     for (cin >> n; i++ < n; d += !c)       for (cin >> a[i] >> b[i], j = c = 0; ++j < i;)         c += a[i] == a[j] & b[i] == b[j];     cout << d;     return 0;   }   