func_code_string: #include <bits/stdc++.h>   using namespace std;   long long bbuy(long long* c, long long l, int n);   int main() {     long long n, l;     cin >> n >> l;     long long c[n];     for (int i = 0; i < n; ++i) {       cin >> c[i];     }     long long bp = c[0];     for (int i = 0; i < n; ++i) {       bp *= 2;       bp = min(bp, c[i]);       if (bp != c[i]) c[i] = -1;     }     long long bcost = 0;     bcost += bbuy(c, l, n);     cout << bcost;     return 0;   }   long long bbuy(long long* c, long long l, int n) {     int i = int(log2(l));     long long gcost = 0;     long long cost = 0, buy;     long long prev = l;     while (i >= n || c[i] == -1) i--;     buy = l / pow(2, i);     l -= buy * pow(2, i);     cost = buy * c[i];     if (l > 0) cost += bbuy(c, l, n);     for (int j = i + 1; j < n; ++j) {       l = prev;       if (c[j] == -1) continue;       buy = (l / pow(2, j)) + 1;       if (cost > buy * c[j]) {         cost = buy * c[j];         l -= buy * pow(2, j);       }     }     gcost += cost;     return gcost;   }   