func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     int a[100005];     int b[100005];     scanf( %d , &n);     for (int i = 1; i <= n; i++) {       scanf( %d%d , &a[i], &b[i]);     }     int flag = 1;     if (n % 2 == 0)       for (int i = 1; i < n / 2; i++) {         if (a[i] + a[i + n / 2] != a[i + 1] + a[i + 1 + n / 2] ||             b[i] + b[i + n / 2] != b[i + 1] + b[i + 1 + n / 2]) {           flag = 0;           break;         }       }     else       flag = 0;     if (flag)       printf( YES n );     else       printf( NO n );   }   