Submission #918347

#	Time	Username	Problem	Language	Result	Execution time	Memory
918347		Ferid20072020	Easter Eggs (info1cup17_eastereggs)	C++17	0 / 100	12 ms	10060 KiB

eastereggs

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

using namespace std;

const int up = 2e5 + 5;

vector<vector<int>> g(up);
vector<int> List;

void DFS(int node , int from){
    List.push_back(node);
    for(auto to : g[node]){
        if(to != from){
            DFS(to , node);
        }
    }
}

int findEgg (int N, vector < pair < int, int > > bridges)
{
    List.clear();
    for(int i=0 ; i<up ; i++){
        g[i].clear();
    }

    for(int i=0 ; i<bridges.size() ; i++){
        int u = bridges[i].first;
        int v = bridges[i].second;
        g[u].push_back(v);
        g[v].push_back(u);
    }

    DFS(1 , 0);


    int l = 0 , r = N - 1;
    while(l < r){
        int mid = (l + r) / 2;
        vector<int> c;
        for(int i=l ; i<=mid ; i++){
            c.push_back(List[i]);
        }
        int ask = query(c);
        if(ask == 1){
            r = mid;
        }
        else{
            l = mid + 1;
        }
    }
    return List[l];
}

Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:27:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int i=0 ; i<bridges.size() ; i++){
      |                   ~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 40
• Subtask 2: 0 / 40
• Subtask 3: 0 / 20