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Submission #913947

# Submission time Handle Problem Language Result Execution time Memory
913947 2024-01-20T15:55:58 Z daoquanglinh2007 Biochips (IZhO12_biochips) C++17
90 / 100
 234 ms 405232 KB 
#include <bits/stdc++.h>
using namespace std;

const int NM = 2e5, MM = 500, inf = 1e9+7;

int N, M, root, p[NM+5], x[NM+5], timer = 0, tin[NM+5], tout[NM+5], tour[NM+5];
vector <int> son[NM+5];
int dp[NM+5][MM+5], ans = 0;

void dfs_euler_tour(int u){
	tin[u] = ++timer;
	tour[timer] = u;
	for (int v : son[u]){
		dfs_euler_tour(v);
	}
	tout[u] = timer;
}

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] == 0) root = i;
		son[p[i]].push_back(i);
	}
	dfs_euler_tour(root);
	for (int i = 1; i <= M; i++) dp[N+1][i] = -inf;
	for (int i = N; i >= 1; i--){
		int u = tour[i];
		for (int j = 1; j <= M; j++)
			dp[i][j] = max(dp[tout[u]+1][j-1]+x[u], dp[i+1][j]);
		ans = max(ans, dp[i][M]);
	}
	cout << ans;
	return 0;
}

Subtask #1
90.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8536 KB Output is correct
2 Incorrect 2 ms 8540 KB Output isn't correct
3 Correct 4 ms 10844 KB Output is correct
4 Correct 8 ms 27484 KB Output is correct
5 Correct 8 ms 29340 KB Output is correct
6 Correct 9 ms 29532 KB Output is correct
7 Correct 157 ms 302276 KB Output is correct
8 Correct 153 ms 302416 KB Output is correct
9 Correct 217 ms 368296 KB Output is correct
10 Correct 234 ms 405232 KB Output is correct