Submission #385719

#	Time	Username	Problem	Language	Result	Execution time	Memory
385719		Iwanttobreakfree	Easter Eggs (info1cup17_eastereggs)	C++17	0 / 100	3 ms	620 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
using namespace std;
vector<int> c;
void conexa(vector<vector<int> >& cone,int raiz,int cont,vector<bool>& visto){
    c.push_back(raiz);
    visto[raiz]=true;
    for(int x: cone[raiz]){
        if(c.size()==cont){
            return;
        }
        if(!visto[x]){
            conexa(cone,x,cont,visto);
        }
    }
}
int findEgg (int N, vector < pair < int, int > > bridges){
    vector<vector<int> > cone(513,vector<int>());
    for(int i=0;i<N-1;i++){
        cone[bridges[i].first].push_back(bridges[i].second);
        cone[bridges[i].second].push_back(bridges[i].first);
    }
    int raiz,sol=0;
    vector<int> lista(N);
    vector<bool> visto(513,false);
    conexa(cone,bridges[0].first,N,visto);
    lista=c;
    vector<bool> posi(513,true);
    int cont=N/2;
    while(cont>0){
        c.clear();
        for(int i=0;i<N;i++){
            if(posi[lista[i]]){
                raiz=lista[i];
                break;
            }
        }
        vector<bool> visto(513,false);
        conexa(cone,raiz,cont,visto);
        if(query(c)){
            set<int> s;
            for(int i=0;i<c.size();i++)s.insert(c[i]);
            for(int i=0;i<N;i++){
                if(s.find(lista[i])==s.end())posi[lista[i]]=false;
            }
            sol=c[0];
            cone[c[0]].clear();
            posi[c[0]]=false;
            cont/=2;
        }
        else {
            for(int i=0;i<c.size();i++)posi[c[i]]=false;
        }
    }
    return sol;
}

Compilation message (stderr)

eastereggs.cpp: In function 'void conexa(std::vector<std::vector<int> >&, int, int, std::vector<bool>&)':
eastereggs.cpp:9:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
    9 |         if(c.size()==cont){
      |            ~~~~~~~~^~~~~~
eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:42:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |             for(int i=0;i<c.size();i++)s.insert(c[i]);
      |                         ~^~~~~~~~~
eastereggs.cpp:52:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |             for(int i=0;i<c.size();i++)posi[c[i]]=false;
      |                         ~^~~~~~~~~
eastereggs.cpp:39:15: warning: 'raiz' may be used uninitialized in this function [-Wmaybe-uninitialized]
   39 |         conexa(cone,raiz,cont,visto);
      |         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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