Submission #483651

#	Time	Username	Problem	Language	Result	Execution time	Memory
483651		alexdumitru	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	21 ms	1776 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
using namespace std;
vector<int> g[55000];
int p[55000],nrr;
void dfs(int nod=1, int t=0)
{
    p[++nrr]=nod;
    for(auto i:g[nod])if(i!=t)dfs(i,nod);
}
bool qq(int poz)
{
    vector<int> qqq;
    for(int i=1;i<=poz;i++)qqq.push_back(p[i]);
    return query(qqq);
}
int findEgg(int N, vector<pair<int,int> > bridges)
{
    for(int i=1;i<=N;i++)g[i].clear();
    int st=1,dr=N-1,m,poz=N;
    for(auto i:bridges)
    {
        g[i.first].push_back(i.second);
        g[i.second].push_back(i.first);
    }
    dfs();
    while(st<=dr)
    {
        m=st+(dr-st)/2;
        if(qq(m))
        {
            poz=m;
            dr=m-1;
        }
        else st=m+1;
    }
    //cout<<poz<<'\n';
    return p[poz];
}

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