func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int N = 0, p = 0, q = 0;     int k = 0;     cin >> N;     for (int i = 0; i < N; i++) {       cin >> p >> q;       if (q - p >= 2) k++;     }     cout << k;     return 0;   }   