Submission #1308853

#	Time	Username	Problem	Language	Result	Execution time	Memory
1308853		a5a7	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	9 ms	516 KiB

eastereggs

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

using namespace std;

int findEgg (int N, vector < pair < int, int > > bridges)
{
    vector<vector<int>> adj(N+1);
    vector<int> dfs_order;
    for (auto x : bridges){
        adj[x.first].push_back(x.second);
        adj[x.second].push_back(x.first);
    }
    function<void(int, int)> dfs = [&](int x, int prev){
        dfs_order.push_back(x);
        for (int nxt : adj[x]){
            if (nxt == prev) continue;
            dfs(nxt, x);
        }
    };
    dfs(1, 0);
    int l = 1, r = N;
    while (l < r){
        int m = (l+r)/2;
        vector<int> qu;
        for (int i = 0; i < m; i++) qu.push_back(dfs_order[i]);
        if (query(qu)){
            r = m;
        }else{
            l = m+1;
        }
    }
    return dfs_order[l-1];
}

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