Submission #1162714

#	Time	Username	Problem	Language	Result	Execution time	Memory
1162714		cnn008	Easter Eggs (info1cup17_eastereggs)	C++20	40 / 100	8 ms	512 KiB

eastereggs

#include "grader.h"
#include <bits/stdc++.h>
using namespace std;
vector <int> g[515],e;
void dfs(int u, int p){
	e.push_back(u);
	for(auto v:g[u]) if(v!=p) dfs(v,u);
}
int findEgg(int n, vector <pair <int,int> > bridges){
	for(int i=1; i<=n; i++) g[i].clear();
	e.clear();
	for(auto [u,v]:bridges){
		g[u].push_back(v);
		g[v].push_back(u);
	}
	dfs(1,0);
	int l=2,r=n,ans=0;
	while(l<=r){
		int mid=(l+r)>>1;
		vector <int> cur;
		for(int i=0; i<mid; i++) cur.push_back(e[i]);
		if(query(cur)) ans=mid,r=mid-1;
		else l=mid+1;
	}
	if(!ans) ans=1;
	return e[ans-1];
}

• Subtask 1: 0 / 40
• Subtask 2: 40 / 40
• Subtask 3: 0 / 20