Submission #913980

#	Time	Username	Problem	Language	Result	Execution time	Memory
913980		trashaccount	Biochips (IZhO12_biochips)	C++11	90 / 100	202 ms	402044 KiB

biochips

#include <bits/stdc++.h>
using namespace std;
 
int N, M, p[200005], x[200005], rt;
vector <int> son[200005];
int timer = 0, dp[200005][505];
 
void dfs(int u){
	int pre = timer;
	for (int v : son[u]) dfs(v);
	timer++;
	for (int i = 1; i <= M; i++)
		dp[timer][i] = max(dp[pre][i-1]+x[u], dp[timer-1][i]);
}
 
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	cin >> N >> M;
	for (int i = 1; i <= N; i++){
		cin >> p[i] >> x[i];
		if (!p[i]) rt = i;
		son[p[i]].push_back(i);
	}
	for (int i = 1; i <= M; i++) dp[0][i] = -1e9;
	dfs(rt);
	cout << dp[timer][M];
	return 0;
}

• Subtask 1: 90 / 100