Submission #1161541

#	Time	Username	Problem	Language	Result	Execution time	Memory
1161541		turska	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	8 ms	484 KiB

eastereggs

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

using namespace std;


vector<vector<int>> adj;




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

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