Submission #1027586

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027586		dozer	Friend (IOI14_friend)	C++14	0 / 100	2 ms	5208 KiB

friend

#define __MAXSIZE__ 100002
#include "friend.h"
#include <bits/stdc++.h>
using namespace std;
#define sp " "
#define endl "\n"
#define pb push_back
#define pii pair<int, int>
#define st first
#define nd second
#define mid (l + r) / 2
#define LL node * 2
#define RR node * 2 + 1
#define fileio() freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#define fastio() cin.tie(0), ios_base::sync_with_stdio(0)
#define ll long long
#define MAXN 200005


const int modulo = 1e9+7;
const ll INF = 2e18 + 7;

vector<int> adj[MAXN];


void dfs(int node, int &a, int &b){
	a++;
	for (auto i : adj[node]){
		dfs(i, b, a);
	}
}


// Find out best sample
int findSample(int n,int confidence[],int host[],int protocol[]){
	int ans=0;
	vector<int> roots;
	roots.pb(0);
	for (int i = 1; i < n; i++){
		if (protocol[i] == 0) //I am your friend
			adj[host[i]].pb(i);
		else if (adj[host[i]].empty()){
			roots.pb(i);
		}
		else adj[adj[host[i]].front()].pb(i);
	}
	for (auto i : roots){
		int a = 0, b = 0;
		dfs(i, a, b);
		ans += max(a, b);
	}
	return ans;
}

/*
// Confidence
int confidence[__MAXSIZE__];

// Host
int host[__MAXSIZE__];

// Protocol
int protocol[__MAXSIZE__];

// Main
int main(void)
{
	fileio();
	int n,i;

	// Number of people
	assert(scanf("%d",&n)==1);
	
	// Confidence
	for(i=0;i<n;i++)
		assert(scanf("%d",&confidence[i])==1);
	
	// Host and Protocol
	for(i=1;i<n;i++)
		assert(scanf("%d %d",&host[i],&protocol[i])==2);
	
	// Answer
	printf("%d\n",findSample(n,confidence,host,protocol));
	return 0;
}
*/

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