func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long N = 100005;   char en =   n ;   long long inf = 1e16;   long long mod = 1e9 + 7;   long long power(long long x, long long n, long long mod) {     long long res = 1;     x %= mod;     while (n) {       if (n & 1) res = (res * x) % mod;       x = (x * x) % mod;       n >>= 1;     }     return res;   }   int32_t main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long n, k;     cin >> n >> k;     long long curr = n * (n + 1) / 2;     if (curr > k) {       cout << -1 << en;       return 0;     }     long long arr[n + 5];     for (long long i = 1; i <= n; i++) arr[i] = i;     long long rem = k - curr;     long long start = 1;     while (rem) {       long long end1 = n - start + 1;       long long max1 = end1 - start;       if (max1 <= 0) break;       if (rem >= max1) {         swap(arr[start], arr[end1]);         rem -= max1;       } else {         swap(arr[start], arr[start + rem]);         break;       }       start++;     }     long long ans = 0;     for (long long i = 1; i <= n; i++) {       ans += max(i, arr[i]);     }     cout << ans << en;     for (long long i = 1; i <= n; i++) cout << i <<    ;     cout << en;     for (long long i = 1; i <= n; i++) cout << arr[i] <<    ;     cout << en;     return 0;   }   