제출 #1146378

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1146378		Alihan_8	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	9 ms	488 KiB

eastereggs

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

using namespace std;

int findEgg (int N, vector < pair < int, int > > bridges){
	vector <vector<int>> adj(N);
	
	for ( auto &[u, v]: bridges ){
		--u, --v;
		
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	
	vector <int> lis;
	
	auto dfs = [&](auto dfs, int u, int p) -> void{
		lis.push_back(u);
		
		for ( auto &v: adj[u] ){
			if ( v != p ) dfs(dfs, v, u);
		}
	};
	
	dfs(dfs, 0, -1);
	
	auto qry = [&](int m){
		vector <int> q;
		
		for ( int i = 0; i <= m; i++ ) q.push_back(lis[i] + 1);
		
		return query(q);
	};
	
	int l = 0, r = N - 1;
	
	while ( l < r ){
		int m = (l + r) / 2;
		
		if ( qry(m) ) r = m;
		else l = m + 1;
	}
	
	return lis[l] + 1;
}

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