Submission #655972

#	Time	Username	Problem	Language	Result	Execution time	Memory
655972		lunchbox1	Magic Tree (CEOI19_magictree)	C++17	100 / 100	279 ms	40248 KiB

magictree

/*
 Magic Tree
 https://oj.uz/problem/view/CEOI19_magictree
*/
#include <bits/stdc++.h>
using namespace std;
 
const int N = 1e5;
 
int main() {
 ios::sync_with_stdio(0), cin.tie(0);
 int n, m, k; cin >> n >> m >> k;
 static int p[N];
 for (int i = 1; i < n; i++) cin >> p[i], p[i]--;
 static pair<int, int> e[N];
 while (m--) {
  int i, d, w; cin >> i >> d >> w, i--;
  e[i] = {d, w};
 }
 static map<int, long long> f[N];
 for (int i = n - 1; i > 0; i--) {
  if (e[i] != make_pair(0, 0)) {
   auto [d, w] = e[i];
   f[i][d] += w;
   auto it = f[i].upper_bound(d);
   while (w > 0 && it != f[i].end()) {
    long long u = min((long long) w, it->second);
    w -= u, it->second -= u, ++it;
   }
  }
  int j = p[i];
  if (f[i].size() > f[j].size()) swap(f[i], f[j]);
  for (auto [k, v] : f[i]) f[j][k] += v;
 }
 long long ans = 0;
 for (auto [k, v] : f[0]) ans += v;
 cout << ans << '\n';
 return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 3 / 3
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 16 / 16
• Subtask 6: 13 / 13
• Subtask 7: 22 / 22
• Subtask 8: 17 / 17