제출 #1189874

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1189874		Joo	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	9 ms	516 KiB

eastereggs

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

using namespace std;

void dfs(int u, int p, vector<vector<int>> &G, vector<int> &orders) {
    orders.emplace_back(u);
    for (int v : G[u]) if (v != p) dfs(v, u, G, orders);
}


int findEgg (int N, vector < pair < int, int > > bridges)
{
    vector<int> orders;
    vector<vector<int>> G(N + 5);
    for (auto [u, v] : bridges) {
        G[u].emplace_back(v);
        G[v].emplace_back(u);
    }
    dfs(1, -1, G, orders);

    int l = 0, r = N - 1;
    while (l < r) {
        int mid = (l + r) / 2;
        vector<int> to_ask;
        for (int i = 0; i <= mid; i++) to_ask.push_back(orders[i]);
        if (query(to_ask)) r = mid;
        else l = mid + 1;
    }

    return orders[l];
}

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