func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 5e5 + 10;   template <typename T>   inline T read() {     T ans = 0, flag = 1;     char c = getchar();     while (!isdigit(c)) {       if (c ==  - ) flag = -1;       c = getchar();     }     while (isdigit(c)) {       ans = ans * 10 + c - 48;       c = getchar();     }     return ans * flag;   }   struct person {     int t, a, b;     person(int t = 0, int a = 0, int b = 0) : a(a), b(b), t(t) {}     inline bool operator<(const person &B) const { return t < B.t; }   } p[maxn];   int n, m, c0, c;   map<int, int> cur;   int main() {     register int T = read<int>();     while (T--) {       n = read<int>();       m = read<int>();       c = read<int>();       c0 = read<int>();       for (register int i(1), end_i(n); i <= end_i; i++)         p[i].t = read<int>(), p[i].a = read<int>(), p[i].b = read<int>();       p[++n] = person(m, 0, 0);       sort(p + 1, p + 1 + n);       long long ans = 0;       cur.clear();       cur[0] = c0;       for (register int i(1), end_i(n); i <= end_i; i++) {         int delta = p[i].t - p[i - 1].t;         if (delta > c) {           ans = -1;           break;         }         while (!cur.empty() && delta) {           int ccc = min(delta, cur.begin()->second);           ans += 1ll * ccc * cur.begin()->first;           delta -= ccc;           c0 -= ccc;           cur.begin()->second -= ccc;           if (!cur.begin()->second) cur.erase(cur.begin());         }         if (delta) {           ans = -1;           break;         }         int Cnt(p[i].a), Cost(p[i].b), ccc(min(c - c0, Cnt));         c0 += ccc;         while (!cur.empty() && ccc < Cnt && Cost < cur.rbegin()->first)           if (Cnt - ccc >= cur.rbegin()->second) {             ccc += cur.rbegin()->second;             cur.erase(--cur.end());           } else {             cur.rbegin()->second -= Cnt - ccc;             ccc = Cnt;           }         cur[Cost] += ccc;       }       cout << ans <<   n ;     }     return 0;   }   