Submission #702504

#	Time	Username	Problem	Language	Result	Execution time	Memory
702504		Darren0724	Biochips (IZhO12_biochips)	C++17	80 / 100	2100 ms	401872 KiB

biochips

//#pragma GCC optimize("Ofast","O3")
//#pragma GCC target("avx2")
#include<bits/stdc++.h>
using namespace std;
const int N=200000;
int n,k;
vector<int> v(N);
vector<vector<int>> adj(N);
vector<vector<int>> dp(501,(vector<int>(N)));
vector<int> leaf(N);
void dfs(int k){
    if(adj[k].size()==0){
        leaf[k]=1;
    }
    for(int u:adj[k]){
        dfs(u);
        leaf[k]+=leaf[u];
        for(int i=min(leaf[k],500);i>0;i--){
            for(int j=1;j<=min(leaf[u],i);j++){
                dp[i][k]=max(dp[i][k],dp[j][u]+dp[i-j][k]);
            }
        }
    }
    dp[1][k]=max(dp[1][k],v[k]);
    return;
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int root=0;
    cin>>n>>k;
    for(int i=0;i<n;i++){
        int p;cin>>p;p--;
        if(p!=-1){
            adj[p].push_back(i);
        }
        else{
            root=i;
        }
        cin>>v[i];
    }
    dfs(root);
    cout<<dp[k][root]<<endl;

    return 0;
}

• Subtask 1: 80 / 100