func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int a[n * 2];     for (int i = 0; i < n * 2; i++) {       cin >> a[i];     }     int room = 0;     for (int i = 0; i < n * 2; i++) {       if (i % 2 == 0) {         if (a[i + 1] - a[i] >= 2) {           room++;         }       }     }     cout << room;   }   