Submission #384478

#	Time	Username	Problem	Language	Result	Execution time	Memory
384478		ak2006	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	24 ms	492 KiB

eastereggs

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

#define pb push_back
using vi = vector<int>;
using vvi = vector<vi>;
vvi adj(513);
vi a;
void dfs(int i,int p)
{
    a.pb(i);
    for (int c:adj[i]){
        if (c != p)
            dfs(c,i);
    }
}
int findEgg(int n,vector<pair<int,int>>b)
{
    for (int i = 0;i<=512;i++)adj[i].clear();
    a.clear();
    for (pair<int,int> i : b)adj[i.first].pb(i.second),adj[i.second].pb(i.first);
    dfs(1,1);
    int l = 0,r = n - 1;
    while (l < r){
        int mid = (l + r + 1)/2;
        if (query(vector<int>(a.begin(),a.begin() + mid))){
            r = mid - 1;
        }
        else l = mid;
    }
    return a[l];
}

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