Submission #723622

#	Time	Username	Problem	Language	Result	Execution time	Memory
723622		drdilyor	Magic Tree (CEOI19_magictree)	C++17	47 / 100	2082 ms	786176 KiB

magictree

#include<bits/stdc++.h>
 
using namespace std;
using ll = long long;
 
 
int main() {
    int n, m, k;
    cin >> n >> m >> k;
 
    vector<vector<int>> child(n);
    vector par(n, -1);
    for (int i = 1; i < n; i++) {
        cin >> par[i];
        child[--par[i]].push_back(i);
    }
 
    map<int,int> comp;
    vector<pair<int,int>> fruit(n);
    for (int i =0; i < m;i ++) {
        ll v, d, w;
        cin >> v >> d >> w;
        v--;
        comp[d] = 0;
        fruit[v] = {d, w};
    }

    k = 0;
    for (auto& mp: comp) mp.second = ++k;
    for (auto& [d, w] : fruit)
        d = comp[d];
 
    auto dp = [&](auto& dp, int i)->vector<ll>{

        vector<vector<ll>> dpc;
        for (int e : child[i])
            dpc.push_back(dp(dp, e));

        vector<ll> res(k+1);
        for (int day = 1; day <= k; day++) {
            for (int j = 0; j < (int)dpc.size(); j++)
                res[day] += dpc[j][day];
            if (day == fruit[i].first)
                res[day] += fruit[i].second;
        }
        int d = fruit[i].first;
        if (d) {
            res[d] = max(res[d], res[d-1]);
            for (int i = d+1; i <= k; i++)
                res[i] = max(res[i], res[d]);
        }
        return res;
    };
    cout << dp(dp, 0)[k] << '\n';
}

• Subtask 1: 6 / 6
• Subtask 2: 0 / 3
• Subtask 3: 0 / 11
• Subtask 4: 12 / 12
• Subtask 5: 16 / 16
• Subtask 6: 13 / 13
• Subtask 7: 0 / 22
• Subtask 8: 0 / 17