func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[200010];   int base;   int n, tmp;   int main() {     cin >> n;     cin >> base;     a[100000]++;     for (int i = 1; i <= n - 1; i++) {       cin >> tmp;       int offset = tmp - base;       if (abs(offset) > 100000) {         cout <<  NO  << endl;         return 0;       }       a[offset + 100000]++;     }     int ub = 100000, lb = 100000;     int cnt = n + a[100000];     while (a[ub]) {       cnt -= a[ub];       ub++;     }     while (a[lb]) {       cnt -= a[lb];       lb--;     }     lb++;     ub--;     if (cnt != 0) {       cout <<  NO ;       return 0;     }     for (int i = lb + 1; i <= ub - 1; i++) {       if (a[i] < 2) {         cout <<  NO ;         return 0;       }       a[i] -= 2;     }     a[lb]--;     a[ub]--;     for (int i = lb; i <= ub; i++) {       if (a[i + 1] < a[i]) {         cout <<  NO ;         return 0;       }       a[i + 1] -= a[i];     }     cout <<  YES ;   }   