func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n, k;     cin >> n >> k;     long long int a[n + 1];     for (long long int i = 1; i < n; i++) cin >> a[i];     long long int i = 1;     long long int sum = 1;     while (i < n) {       if (sum >= k) break;       sum = i + a[i];       i = sum;     }     if (sum == k)       cout <<  YES  << endl;     else       cout <<  NO  << endl;   }   