func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[20007];   int main() {     ios_base::sync_with_stdio(0);     int t = 1;     while (t--) {       int n;       cin >> n;       map<int, int> mp;       for (int i = 0; i < n; i++) {         int x, y;         cin >> x >> y;         mp[x] = y;         if (mp[x] == -1 * mp[x + y]) {           cout <<  YES ;           return 0;         }       }       cout <<  NO             <<   n ;     }     return 0;   }   