제출 #162054

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
162054		oolimry	Friend (IOI14_friend)	C++14	46 / 100	37 ms	2724 KiB

friend

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

using namespace std;

int findSample(int n, int confidence[], int host[], int protocol[]) {
	
	bool two = true;
	bool three = true;
	bool four = true;
	for(int i = 1;i < n;i++){
		if(protocol[i] != 0) four = false;
		if(protocol[i] != 2) three = false;
		if(protocol[i] != 1) two = false;
	}
	if(four){
		vector<int> child[n];
		for(int i = 1;i < n;i++){
			child[host[i]].push_back(i);
		}
		typedef pair<int,int> ii;
		ii dp[n];
		fill(dp,dp+n,ii(0,0));
		for(int u = n-1;u >= 0;u--){
			dp[u] = ii(confidence[u],0);
			for(int v : child[u]){
				dp[u].first += dp[v].second;
				dp[u].second += dp[v].first;
			}
			dp[u].first = max(dp[u].second,dp[u].first);
		}
		return dp[0].first;
	}
	else if(three){
		    long long s = 0;
			for(int i = 0;i < n;i++){
				s = max((long long)confidence[i],s);
			}
			return s;
	}
	else if(two){
		long long s = 0;
		for(int i = 0;i < n;i++){
			s += confidence[i];
		}
		return s;
	}
	else if(n <= 10){
		vector<int> adj[n];
		for(int u = 1;u < n;u++){
			if(protocol[u] == 1 || protocol[u] == 2){
				//cout << u << "\n";
				for(int v : adj[host[u]]){
					//cout << v << " ";
					adj[u].push_back(v);
					adj[v].push_back(u);
				}
				//cout << "\n";
			}
			if(protocol[u] == 0 || protocol[u] == 2){
				adj[u].push_back(host[u]);
				adj[host[u]].push_back(u);
			}
		}
		
		long long ovans = 0;
		for(int mask = 0;mask < (1<<n);mask++){
			bool can = true;
			for(int u = 0;u < n;u++){
				for(int v : adj[u]){
					if((mask & (1<<u)) != 0 && (mask & (1<<v)) != 0){
						can = false;
						break;
					}
				}
			}
			//cout << mask << " ";
			if(can){
				long long ans = 0;
				for(int i = 0;i < n;i++){
					if((mask & (1<<i)) != 0) ans += confidence[i];
				}
				ovans = max(ovans,ans);
			}
		}
		return ovans;
	}
	
	
	return 4;
}

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