func_code_string: #include <bits/stdc++.h>   using namespace std;   struct camel {     int x, y;   };   int main() {     int n;     bool r = false;     cin >> n;     camel arr[n];     for (int i = 0; i < n; i++) cin >> arr[i].x >> arr[i].y;     for (int i = 0; i < n; i++) {       for (int j = 0; j < n; j++)         if (arr[i].x + arr[i].y == arr[j].x)           if (arr[j].x + arr[j].y == arr[i].x) r = true;     }     if (r)       cout <<  YES ;     else       cout <<  NO ;   }   