Submission #334565

#	Time	Username	Problem	Language	Result	Execution time	Memory
334565		nandonathaniel	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	21 ms	492 KiB

eastereggs

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

using namespace std;

const int MAXN=515;

vector<int> adj[MAXN];
int preorder[MAXN],nomor[MAXN],idx;

void dfs(int now,int par){
	idx++;
	preorder[idx]=now;
	for(auto nxt : adj[now]){
		if(nxt==par)continue;
		dfs(nxt,now);
	}
}

int findEgg (int N, vector < pair < int, int > > bridges)
{
	idx=0;
	for(int i=1;i<=N;i++)adj[i].clear();
    for(int i=0;i<N-1;i++){
    	adj[bridges[i].first].push_back(bridges[i].second);
    	adj[bridges[i].second].push_back(bridges[i].first);
	}
	dfs(1,-1);
	int ki=1,ka=N;
	while(ki<ka){
//		cout << ki << " " << ka << endl;
		int mid=(ki+ka)/2;
		vector<int> v;
		for(int i=1;i<=mid;i++)v.push_back(preorder[i]);
		if(query(v)){
			ka=mid;
		}
		else ki=mid+1;
	}
    return preorder[ki];
}

• Subtask 1: 40 / 40
• Subtask 2: 40 / 40
• Subtask 3: 20 / 20