Submission #1209925

#	Time	Username	Problem	Language	Result	Execution time	Memory
1209925		PlayVoltz	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	9 ms	504 KiB

eastereggs

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

#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second

vector<int> ord;
vector<vector<int> > graph;

void dfs(int node, int par){
	ord.pb(node);
	for (auto num:graph[node])if (num!=par)dfs(num, node);
}

int findEgg (int n, vector<pii> edges){
	graph.clear();
	ord.clear();
	graph.resize(n+1);
	for (auto c:edges){
		graph[c.fi].pb(c.se);
		graph[c.se].pb(c.fi);
	}
	dfs(1, -1);
	int low=0, high=n;
	while (low+1<high){
		int mid=(low+high)/2;
		vector<int> temp;
		for (int i=0; i<mid; ++i)temp.pb(ord[i]);
		if (query(temp))high=mid;
		else low=mid;
	}
	return ord[high-1];
}

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