func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<int> a;   int n;   bool check() {     for (int i = 1; i < n; i++) {       if (abs(a[i - 1] - a[i]) >= 2) return 1;     }     return 0;   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cin >> n;     a.resize(n);     for (int i = 0; i < n; i++) {       cin >> a[i];     }     if (check()) {       cout <<  NO ;       return 0;     }     int last = -1;     for (int i = 0; i < n; i++) {       int mx = -1, mxj = 0;       for (int j = 0; j < n; j++) {         if (mx < a[j]) {           mx = a[j];           mxj = j;         }       }       if (last == -1) last = mx;       if (mx == -1) break;       if (abs(last - mx) >= 2) {         cout <<  NO ;         return 0;       }       a[mxj] = -1;       last = mx;     }     cout <<  YES ;   }   