Submission #1291208

#	Time	Username	Problem	Language	Result	Execution time	Memory
1291208		gramathegod	Biochips (IZhO12_biochips)	C++20	0 / 100	2 ms	576 KiB

biochips

#include <bits/stdc++.h>

using namespace std;

const int N=2e5+5, M=505;
vector<int>adj[N];
int dp[N][M], sz[N], val[N], n,m,root;

void getsz(int i){
    for (auto x:adj[i]){
        getsz(x);
        sz[i]+=sz[x];
    }
    if (adj[i].size()==0){
        sz[i]=1;
    }
}

void dfs(int i){
    int maxj=min(m,sz[i]);
    for (auto x:adj[i]){
        dfs(x);
        int maxk=min(m,sz[x]);
        for (int j=maxj;j>=0;j--){
            for (int k=min(maxk,j);k>=0;k--){
                dp[i][j]=max(dp[i][j],  dp[i][j-k]+dp[x][k]);
            }
        }
    }
    dp[i][1]=max(dp[i][1], val[i]);
}

int main()
{
    freopen("d.in", "r", stdin);
    freopen("d.out", "w", stdout);
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin>>n>>m;
    for (int i=1;i<=n;i++){
        int p;cin>>p>>val[i];
        if (p==0){
            root=i;
        }
        adj[p].push_back(i);
    }
    getsz(root);
    dfs(root);
    cout<<dp[root][m];
    return 0;
}

Compilation message (stderr)

biochips.cpp: In function 'int main()':
biochips.cpp:35:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |     freopen("d.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~
biochips.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     freopen("d.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 100