Submission #579433

#	Time	Username	Problem	Language	Result	Execution time	Memory
579433		tengiz05	Magic Tree (CEOI19_magictree)	C++17	100 / 100	153 ms	37740 KiB

magictree

#include <bits/stdc++.h>

using namespace std;
using i64 = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n, m, k;
    cin >> n >> m >> k;
    
    vector<int> p(n, -1);
    vector<vector<int>> e(n);
    for (int i = 1; i < n; i++) {
        cin >> p[i];
        p[i]--;
        e[p[i]].push_back(i);
    }
    
    vector<int> w(n), d(n, k + 1);
    for (int i = 0; i < m; i++) {
        int v;
        cin >> v;
        v--;
        cin >> d[v] >> w[v];
    }
    
    vector<map<int, i64>> g(n);
    
    function<void(int)> dfs = [&](int u) {
        for (int v : e[u]) {
            dfs(v);
            if (g[v].size() > g[u].size()) {
                swap(g[u], g[v]);
            }
            for (auto [x, y] : g[v]) {
                g[u][x] += y;
            }
        }
        g[u][d[u]] += w[u];
        i64 x = 0;
        while (true) {
            auto it = g[u].upper_bound(d[u]);
            if (it == g[u].end())
                break;
            if (it->second <= w[u] - x) {
                x += it->second;
                g[u].erase(it);
            } else {
                it->second -= w[u];
                it->second += x;
                break;
            }
        }
    };
    
    dfs(0);
    
    i64 ans = 0;
    i64 sum = 0;
    for (auto [x, y] : g[0]) {
        sum += y;
        ans = max(ans, sum);
    }
    
    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