Submission #152019

#	Time	Username	Problem	Language	Result	Execution time	Memory
152019		ignifi	Friend (IOI14_friend)	C++14	35 / 100	5 ms	2912 KiB

friend

#include "friend.h"
#include <bits/stdc++.h>

using namespace std;

typedef pair<int, int> pii;

constexpr int MAXN = 100000;

vector<pii> adj[MAXN + 2];
int *conf;

pii recur(int u, bool k) {
	int a = 0, b = 0, c = 0, d = 0;
	for(pii vt : adj[u]) {
		int v = vt.first, t = vt.second;
		k &= t == 1;
		pii res = recur(v, k);
		int va = res.first, vb = res.second, mvab = max(va, vb);
		if(k) {
			a += mvab;
			b += mvab;
			continue;
		}
		k = false;
		if(t == 0) {
			a += mvab;
		} else {
			c = max(c, b + vb);
			if(t == 1)
				d = max(d, vb - va);
		}
		b += va;
	}
	b += conf[u] + d;
	//cout << "? " << u << ' ' << a << ' ' << max(b, c) << endl;
	return make_pair(a, max(b, c));
}

// Find out best sample
int findSample(int n,int confidence[],int host[],int protocol[]){
	for(int i = 1; i < n; i++)
		adj[host[i]].push_back(make_pair(i, protocol[i]));
	conf = confidence;
	pii res = recur(0, true);
	return max(res.first, res.second);
}

• Subtask 1: 0 / 11
• Subtask 2: 8 / 8
• Subtask 3: 8 / 8
• Subtask 4: 19 / 19
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31