func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, performance;     long long cost = 0;     long long k;     cin >> n >> k;     int x[n], c[n];     for (int& e : x) cin >> e;     cin >> performance;     for (int& e : c) cin >> e;     priority_queue<int, vector<int>, greater<int>> rem;     int i = 0;     for (int e : x) {       rem.push(c[i++]);       while (k < e) {         if (rem.empty()) {           cout <<  -1 n ;           return 0;         }         k += performance, cost += rem.top(), rem.pop();       }     }     cout << cost <<   n ;     return 0;   }   