Submission #98259

#	Time	Username	Problem	Language	Result	Execution time	Memory
98259		Vasiljko	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	33 ms	440 KiB

eastereggs

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

typedef long long ll;
const ll MOD = 1e9+7;

int n,cnt,ans;
vector<int>v[550],seq;

void dfs(int s,int p){
    seq.push_back(s);
    for(auto e:v[s])if(e!=p)dfs(e,s);
}

int findEgg(int N,vector<pair<int,int> >b){
    n=N;
    for(int i=1;i<=n;i++)v[i].clear();
    for(auto e:b){
        v[e.first].push_back(e.second);
        v[e.second].push_back(e.first);
    }
    seq.clear();
    dfs(1,0);

    int l=0;
    int r=n-2;
    ans=-1;
    vector<int>q;

    while(l<=r){
        int mid=(l+r)>>1;
        q.clear();
        for(int i=0;i<=mid;i++)q.push_back(seq[i]);
        if(query(q)){
            r=mid-1;
            ans=mid;
        }else{
            l=mid+1;
        }
    }
    if(ans==-1)ans=n-1;

    return seq[ans];
}

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