제출 #1178300

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1178300		perchuts	Easter Eggs (info1cup17_eastereggs)	C++20	0 / 100	0 ms	472 KiB

eastereggs

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


int findEgg(int n, vector<pair<int, int>> edg) {
    vector<vector<int>> g(n+1);
    for (auto [x, y] : edg) g[x].push_back(y), g[y].push_back(x);
    vector<int> in(n+1);
    int tt = 1;
    auto dfs = [&] (auto&& self, int u, int p) -> void {
        if (tt > n) while (true) {}
        in[tt] = u;
        tt++;
        for (auto v : g[u]) {
            if (v == p) continue;
            self(self, v, u);
        }
    };
    dfs(dfs, 1, 1);
    int l = 1, r = n, ans = n;
    while (l <= r) {
        int md = l + (r-l+1)/2;
        vector<int> qq;
        for (int i = 1; i <= md; ++i) qq.push_back(in[i]);
        if (query(qq)) ans = md, l = md+1;
        else r = md-1;
    }
    return in[ans];
}

• Subtask 1: 0 / 40
• Subtask 2: 0 / 40
• Subtask 3: 0 / 20