Submission #89245

#	Time	Username	Problem	Language	Result	Execution time	Memory
89245		turbat	Biochips (IZhO12_biochips)	C++14	100 / 100	853 ms	407840 KiB

biochips

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define N  200005
#define M  505
int dp[N][M], pr[N], n, m, s[N], cnt, in[N], out[N], l, r, now, ans;
vector <int> child[N], ve;
void dfs(int x){
	if (!child[x].size()) cnt++;
	in[x] = cnt;
	for (auto a : child[x])
		dfs(a);
	ve.pb(x);
	out[x] = cnt;
}
int main (){
	cin >> n>> m;
	for (int i = 1;i <= n;i++){
		cin >> pr[i]>> s[i];
		child[pr[i]].pb(i);
	}
	dfs(child[0][0]);
	for (auto x : ve){
		l = in[x];
		r = out[x];
		for (int i = 0;i <= m;i++)
			dp[r][i] = max(dp[r][i], dp[r - 1][i]);
		for (int i = 1;i <= min(l, m);i++)
			dp[r][i] = max(dp[r][i], dp[l - 1][i - 1] + s[x]);
	}
	for (int i = 1;i <= cnt;i++)
		ans = max(ans, dp[i][m]);
	cout << ans;
}

• Subtask 1: 100 / 100