Submission #860105

#	Time	Username	Problem	Language	Result	Execution time	Memory
860105		Nonoze	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	14 ms	1496 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
using namespace std;

vector<int> vec;
vector<bool> visited(520, false);
vector<int> adj[520];

void dfs(int s) {
    if (visited[s]) return;
    vec.push_back(s);
    visited[s]=true;
    for (auto u: adj[s]) dfs(u);
}

int findEgg (int N, vector < pair < int, int > > bridges)
{
    vec.clear();
    for (int i=0; i<=N; i++) adj[i].clear(), visited[i]=false;
    for (auto u: bridges) {
        adj[u.first].push_back(u.second);
        adj[u.second].push_back(u.first);
    }
    dfs(1);
    int l=0, r=N-1;
    while (l<r) {
        int mid=l+(r-l)/2;
        if (query(vector<int>(vec.begin(), vec.begin()+mid+1))) {
            r=mid;
        } else {
            l=mid+1;
        }
    }
    return vec[l];
}

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