Submission #945785

#	Time	Username	Problem	Language	Result	Execution time	Memory
945785		vjudge1	Magic Tree (CEOI19_magictree)	C++17	34 / 100	487 ms	1048576 KiB

magictree

#include <bits/stdc++.h>

using namespace std;

#define all(x) x.begin(), x.end()
#define ar array
#define pb push_back
#define ln '\n'
#define int long long

using i64 = long long;

template <class F, class _S>
bool chmin(F &u, const _S &v){
    bool flag = false;
    if ( u > v ){
        u = v; flag |= true;
    }
    return flag;
}

template <class F, class _S>
bool chmax(F &u, const _S &v){
    bool flag = false;
    if ( u < v ){
        u = v; flag |= true;
    }
    return flag;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m, k; cin >> n >> m >> k;
    vector <vector<int>> G(n);
    for ( int i = 1; i < n; i++ ){
        int p; cin >> p;
        --p;
        G[p].pb(i);
    }
    vector <int> w(n), d(n);
    for ( int i = 0; i < m; i++ ){
        int d_, v, w_; cin >> v >> d_ >> w_;
        --v;
        w[v] = w_;
        d[v] = d_;
    }
    vector <vector<int>> dp(n, vector <int> (k + 1));
    auto dfs = [&](auto dfs, int u) -> void{
        for ( auto &v: G[u] ){
            dfs(dfs, v);
        }
        for ( int j = 1; j <= k; j++ ){
            int opt = 0;
            for ( auto &v: G[u] ){
                opt += dp[v][j];
            }
            chmax(dp[u][j], dp[u][j - 1]);
            if ( j <= d[u] ){
                chmax(dp[u][d[u]], opt + w[u]);
            }
            chmax(dp[u][j], opt);
        }
    };
    dfs(dfs, 0);
    cout << dp[0][k];

    cout << '\n';
}

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