func_code_string: #include <bits/stdc++.h>   using namespace std;   static const int INF = 0x3f3f3f3f;   static const long long INFL = 0x3f3f3f3f3f3f3f3fLL;   template <typename T, typename U>   static void amin(T &x, U y) {     if (y < x) x = y;   }   template <typename T, typename U>   static void amax(T &x, U y) {     if (x < y) x = y;   }   template <typename It>   void make_fenwick(It beg, size_t n) {     for (size_t i = 0; i < n; i++) {       size_t p = i | (i + 1);       if (p < n) beg[p] += beg[i];     }   }   template <typename It, typename Val>   void add_fenwick(It beg, size_t n, size_t i, Val val) {     for (; i < n; i |= i + 1) beg[i] += val;   }   template <typename It, typename Val>   Val sum_fenwick(It beg, size_t i, Val sum) {     for (; i > 0; i = i & (i - 1)) sum += beg[i - 1];     return sum;   }   template <typename It>   typename std::iterator_traits<It>::value_type sum_fenwick(It beg, size_t i) {     return sum_fenwick(beg, i, typename std::iterator_traits<It>::value_type());   }   size_t highestOneBit(size_t v) {     v |= v >> 1;     v |= v >> 2;     v |= v >> 4;     v |= v >> 8;     v |= v >> 16;     return (v >> 1) + 1;   }   template <typename It, typename Val, typename Cmp>   size_t search_fenwick(It beg, size_t n, Val val, Val left, Cmp cmp) {     if (!cmp(left, val)) return 0;     size_t i = 0;     for (size_t w = highestOneBit(n); w > 0; w >>= 1) {       if (i + w <= n) {         Val mid = left;         mid += beg[i + w - 1];         if (cmp(mid, val)) {           i += w;           left = mid;         }       }     }     return i + 1;   }   template <typename It, typename Val>   size_t lower_bound_fenwick(It beg, size_t n, Val val) {     return search_fenwick(beg, n, val, Val(), std::less<Val>());   }   int main() {     int n;     int m;     while (~scanf( %d%d , &n, &m)) {       vector<vector<int> > graph(n);       for (int i = 0; i < m; ++i) {         int u, v;         scanf( %d%d , &u, &v), --u, --v;         graph[u].push_back(v);         graph[v].push_back(u);       }       int w;       scanf( %d , &w);       vector<vector<pair<int, int> > > shops(n);       vector<int> prices;       for (int(i) = 0; (i) < (int)(w); ++(i)) {         int c;         int k;         int p;         scanf( %d%d%d , &c, &k, &p), --c;         shops[c].emplace_back(k, p);         prices.push_back(p);       }       sort(prices.begin(), prices.end());       prices.erase(unique(prices.begin(), prices.end()), prices.end());       int P = (int)prices.size();       for (int(i) = 0; (i) < (int)(n); ++(i))         for (auto &s : shops[i])           s.second = (int)(lower_bound(prices.begin(), prices.end(), s.second) -                            prices.begin());       int q;       scanf( %d , &q);       vector<int> que(n), dist, ft;       vector<long long> ftsum;       for (int(ii) = 0; (ii) < (int)(q); ++(ii)) {         int g;         int r;         int a;         scanf( %d%d%d , &g, &r, &a), --g;         int qt = 0;         que[qt++] = g;         dist.assign(n, INF);         dist[g] = 0;         ft.assign(P, 0);         ftsum.assign(P, 0);         int ans = -1;         for (int qh = 0; qh < qt; ++qh) {           int i = que[qh];           int d = dist[i];           for (auto s : shops[i]) {             int k, pi;             tie(k, pi) = s;             add_fenwick(ft.begin(), ft.size(), pi, k);             add_fenwick(ftsum.begin(), ftsum.size(), pi,                         (long long)k * prices[pi]);           }           int pi = lower_bound_fenwick(ft.begin(), ft.size(), r) - 1;           if (pi < P) {             long long p = sum_fenwick(ftsum.begin(), pi);             p += (long long)prices[pi] * (r - sum_fenwick(ft.begin(), pi));             if (p <= a) {               ans = d;               break;             }           }           for (int j : graph[i]) {             if (dist[j] != INF) continue;             dist[j] = dist[i] + 1;             que[qt++] = j;           }         }         printf( %d n , ans);       }     }     return 0;   }   