Submission #435944

#	Time	Username	Problem	Language	Result	Execution time	Memory
435944		cgiosy	Biochips (IZhO12_biochips)	C++17	100 / 100	202 ms	11512 KiB

biochips

// gs14004's code test
#include <bits/stdc++.h>
using namespace std;

int n,m,inp[200005];
 
int piv,sz[200005],a[200005];
vector<int> g[200005];
int root;
 
int dfs(int x){
    int num = ++piv;
    a[num] = inp[x];
    sz[num] = 1;
    for(int &i : g[x]){
        sz[num] += dfs(i);
    }
    return sz[num];
}
 
int dp[2][200005];
 
void mx(int&a, int b) { a=max(a, b); }
int main() {
	ios::sync_with_stdio(0);cin.tie(0);
	cin>>n>>m;
	for(int i=1; i<=n; i++) {
		int p;
		cin>>p>>inp[i];
		if(p) g[p].push_back(i);
		else root=i;
	}
    dfs(root);
    for (int i=1; i<=m; i++) {
        dp[i%2][n+1] = -1e9;
        for (int j=n; j; j--) {
            dp[i%2][j] = max(dp[i%2][j+1],dp[(i-1)%2][j+sz[j]] + a[j]);
        }
    }
	cout<<dp[m%2][1]<<'\n';
}

• Subtask 1: 100 / 100