Submission #579378

#	Time	Username	Problem	Language	Result	Execution time	Memory
579378		tengiz05	Magic Tree (CEOI19_magictree)	C++17	19 / 100	2076 ms	16644 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<tuple<int, int, int>> a(m);
    for (auto &[d, v, w] : a) {
        cin >> v >> d >> w;
        v--;
    }
    
    vector<int> dep(n);
    function<void(int)> dfs = [&](int u) {
        for (int v : e[u]) {
            dep[v] = dep[u] + 1;
            dfs(v);
        }
    };
    
    dfs(0);
    
    sort(a.begin(), a.end(), [&](const tuple<int, int, int> &a, const tuple<int, int, int> &b) {
        if (get<0>(a) != get<0>(b))
            return get<0>(a) < get<0>(b);
        return dep[get<1>(a)] > dep[get<1>(b)];
    });
    
    vector<i64> dp(n);
    
    for (auto [d, v, w] : a) {
        int u = v;
        i64 x = dp[u];
        dp[u] = w;
        for (int v : e[u]) {
            dp[u] += dp[v];
        }
        dp[u] = max(dp[u], x);
        while (u != -1) {
            i64 x = dp[u];
            dp[u] = 0;
            for (int v : e[u]) {
                dp[u] += dp[v];
            }
            dp[u] = max(dp[u], x);
            u = p[u];
        }
    }
    
    cout << dp[0] << "\n";
    
    return 0;
}

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