Submission #1057179

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057179		Drifter24	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	12 ms	616 KiB

eastereggs

#include <bits/stdc++.h>
using namespace std;

int query(vector < int > islands);
void dfs(int v, int p, vector<vector<int>>& adj, vector<int>& ans){
	ans.push_back(v);
	for(int u:adj[v]){
		if(u==p)continue;
		dfs(u, v, adj, ans);
	}
}

int findEgg(int N, vector < pair < int, int > > bridges){
	vector<int> ans;
	vector<vector<int>> adj(N+1, vector<int>());
	for(auto x:bridges){
		adj[x.first].push_back(x.second);
		adj[x.second].push_back(x.first);
	}
	dfs(1, 0, adj, ans);
	int l=0,r=N-1;
	while(r!=l){
		int m=(r+l+1)/2;
		if(query(vector<int>(ans.begin(), ans.begin() + m)))r=m-1;
		else l=m;
	}
	return ans[l];
}

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