Submission #723537

#	Time	Username	Problem	Language	Result	Execution time	Memory
723537		dxz05	Magic Tree (CEOI19_magictree)	C++17	0 / 100	2058 ms	8624 KiB

magictree

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
#define all(x) (x).begin(), (x).end()
#define MP make_pair
const int N = 100500;

vector<int> g[N];
int tin[N], tout[N], timer = 0;
void dfs(int v){
    tin[v] = tout[v] = ++timer;
    for (int u : g[v]){
        dfs(u);
        tout[v] = tout[u];
    }
}

bool is_ancestor(int p, int v){
    return tin[p] <= tin[v] && tout[v] <= tout[p];
}

void solve(){
    int n, m, k;
    cin >> n >> m >> k;

    for (int i = 2; i <= n; i++){
        int p;
        cin >> p;
        g[p].push_back(i);
    }

    dfs(1);

    vector<tuple<int, int, int>> fruits;
    for (int i = 0; i < m; i++){
        int v, d, w;
        cin >> v >> d >> w;
        fruits.emplace_back(v, d, w);
    }

    ll ans = 0;
    for (int i = 0; i < m; i++){
        ll sum = 0;
        int v = get<0>(fruits[i]);

        for (int j = 0; j < m; j++){
            if (i == j) continue;

            auto [u, d, w] = fruits[j];

            if (is_ancestor(v, u) && d > get<1>(fruits[i])) sum += w;
        }
        if (sum <= get<2>(fruits[i])){
            ans += get<2>(fruits[i]);
        }
    }

    cout << ans << endl;

}

int main() {
    ios_base::sync_with_stdio(false);

#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    solve();

    return 0;
}

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