Submission #498738

#	Time	Username	Problem	Language	Result	Execution time	Memory
498738		ahmedfouadnew	Easter Eggs (info1cup17_eastereggs)	C++17	81 / 100	27 ms	408 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
//#include "grader.cpp"
#define pb push_back
#define f first
#define s second
using namespace std;
vector<int>adj[606];
int n;
vector<int>vv;
void dfs(int u,int p)
{
    vv.pb(u);
    for(int v:adj[u])
    {
        if(v==p) continue;

        dfs(v,u);
        vv.pb(u);
    }
}
int findEgg (int N, vector < pair < int, int > > bridges)
{
    if(N==1) return 1;
    for(int i=0;i<=N;i++)
    {
        adj[i].clear();
    }
    vv.clear();
    n=N;
    for(int i=0;i<bridges.size();i++)
    {
        adj[bridges[i].f].pb(bridges[i].s);
        adj[bridges[i].s].pb(bridges[i].f);
    }
    dfs(rand()%n+1,0);
    int s=0,e=vv.size()-2;
    while(s<e)
    {
        int mid=s+(e-s)/2;

        set<int>st;
        for(int i=s;i<=e;i++)
        {
            st.insert(vv[i]);
        }
        if(st.size()==1) return vv[s];
        st.clear();
        for(int ii=s;ii<=mid;ii++)
            st.insert(vv[ii]);
        vector<int>qr(st.begin(),st.end());
        if(query(qr))
        {
            e=mid;
        }
        else
        {
            s=mid+1;
        }
    }
    return vv[s];
}

Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:31:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for(int i=0;i<bridges.size();i++)
      |                 ~^~~~~~~~~~~~~~~

• Subtask 1: 32 / 40
• Subtask 2: 34 / 40
• Subtask 3: 15 / 20