Submission #1082586

#	Time	Username	Problem	Language	Result	Execution time	Memory
1082586		KALARRY	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	12 ms	744 KiB

eastereggs

//chockolateman

#include<bits/stdc++.h>
#include "grader.h"


using namespace std;

int n,total = 512,counter;
bool asked[520];
vector<int> adj[520];
vector<int> to_ask;
bool possible[520];

void init(int N)
{
    n = N;
    for(int i = 1 ; i <= n ; i++)
        adj[i].clear();
    total = 0;
    for(int i = 1 ; i <= n ; i++)
    {
        asked[i] = false;
        possible[i] = true;
        total++;
    }
}

void dfs(int v,int p)
{
    counter += possible[v];
    to_ask.push_back(v);
    asked[v] = true;
    for(auto u : adj[v])
    {
        if(counter==total/2)
            return;
        if(u!=p)
            dfs(u,v);
    }
}

int findEgg(int N, vector < pair < int, int > > bridges)
{
    init(N);
    for(auto e : bridges)
    {
        int a = e.first;
        int b = e.second;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    while(total > 1)
    {
        dfs(1,1);
        int res = query(to_ask);
        if(res==1)
        {
            for(int i = 1 ; i <= N ; i++)
                possible[i] &= asked[i];
        }
        else
            for(auto v : to_ask)
                possible[v] = false;
        
        to_ask.clear();
        counter = 0;
        total = 0;
        for(int i = 1 ; i <= N ; i++)
        {
            total += possible[i];
            asked[i] = false;
        }
    }
    for(int i = 1 ; i <= N ; i++)
        if(possible[i])
            return i;
}

Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:78:1: warning: control reaches end of non-void function [-Wreturn-type]
   78 | }
      | ^

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