Submission #1145950

#	Time	Username	Problem	Language	Result	Execution time	Memory
1145950		fnfi	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	8 ms	504 KiB

eastereggs

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

const int maxn=600;
vector<int>v1[maxn],euler;
bool used[maxn];

void dfs(int node)
{
    euler.push_back(node);
    used[node]=true;
    for(int i : v1[node])
    {
        if(!used[i])
        {
            dfs(i);
        }
    }
}

int findEgg(int N, vector < pair < int, int > > bridges)
{
    memset(used,false,sizeof(used));
    for(int i=1;i<=512;i++)v1[i].clear();
    euler.clear();
    for(pair<int,int>p : bridges)
    {
        v1[p.first].push_back(p.second);
        v1[p.second].push_back(p.first);
    }

    dfs(1);

    ///bin search

    int l=0,r=euler.size()-1,mid,curr;
    vector<int>ask;
    while(l<r)
    {
        mid=(l+r)/2;
        ask.clear();
        for(int i=0;i<=mid;i++)ask.push_back(euler[i]);
        curr=query(ask);
        if(curr==1)
            r=mid;
        else l=mid+1;
    }
    return euler[l];
}

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