func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, k, t = 0, a[30005];     cin >> n >> k;     for (int i = 1; i < n; i++) cin >> a[i];     for (t = 1; t < k; t += a[t])       ;     cout << (t == k ?  YES  :  NO );   }   