func_code_string: #include <bits/stdc++.h>   using namespace std;   const long double eps = 1e-12;   pair<long long, long long> save[200005];   long long cnt[50];   int main(void) {     long long n;     cin >> n;     if (n & 1) {       char ch;       while (cin >> ch)         ;       cout <<  no ;       return 0;     }     for (long long i = 1; i <= n; i++) {       cin >> save[i].first >> save[i].second;     }     long long half = n / 2;     long double x0 = (save[1].first + save[half + 1].first) / 2.0;     long double y0 = (save[1].second + save[half + 1].second) / 2.0;     for (int i = 2; i <= half; i++) {       if (fabs((save[i].first + save[half + i].first) / 2.0 - x0) < eps &&           fabs((save[i].second + save[half + i].second) / 2.0 - y0) < eps) {         ;       } else {         cout <<  no ;         return 0;       }     }     cout <<  yes ;     return 0;   }   