func_code_string: #include <bits/stdc++.h>   using namespace std;   map<int, int> ara;   int main() {     int n, k;     cin >> n >> k;     int t = n / 2;     if (n == 1 && k != 0) {       cout << -1;       return 0;     }     if (n == 1 && k == 0) {       cout << 1;       return 0;     }     if (k < t) {       cout << -1;       return 0;     } else {       int t2 = k - t;       t2++;       cout << t2 <<     << t2 * 2;       cout <<    ;       ara[t2] = 1;       ara[t2 * 2] = 1;       int cnt = 1;       for (int i = 1; i <= n - 2; i++) {         if (ara[cnt] == 1) cnt++;         if (ara[cnt] == 1) cnt++;         cout << cnt <<    ;         cnt++;       }     }     return 0;   }   