func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, a, b, last = 1;     cin >> n >> a >> b;     if (a > 0 && a > n - 2) {       cout << -1;       return 0;     }     cout << last;     for (int i = 1; i < n; i++) {       cout <<    ;       if (b) {         last <<= 1;         cout << last;         b--;       } else if (a && i >= 2) {         last++;         cout << last;         a--;       } else         cout << last;     }     cin >> n;   }   