Submission #403590

#	Time	Username	Problem	Language	Result	Execution time	Memory
403590		hltk	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	24 ms	468 KiB

eastereggs

#include <bits/stdc++.h>
using namespace std;
#include "grader.h"
int findEgg(int n, vector<pair<int, int>> bridges) {
	vector<vector<int>> g(n + 1);
	for (auto [a, b] : bridges) {
		g[a].push_back(b);
		g[b].push_back(a);
	}
	vector<int> ord;
	function<void(int, int)> dfs = [&](int v, int p) {
		ord.push_back(v);
		for (int u : g[v]) {
			if (u == p) continue;
			dfs(u, v);
		}
	};
	dfs(1, -1);
	int l = 0, r = (int) ord.size() - 1;
	while (l < r) {
		int m = (l + r) / 2;
		if (query({ord.begin(), ord.begin() + m + 1})) r = m;
		else l = m + 1;
	}
	return ord[l];
}

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