Cod sursa(job #2171780)

Utilizator MaaaaaCristina Ma Maaaaa Data 15 martie 2018 13:30:03
Problema Ciclu Eulerian Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.03 kb
#include <fstream>
#include <vector>
#define nmax 100005
#define mmax 500005
using namespace std;
fstream f1("ciclueuler.in", ios::in);
fstream f2("ciclueuler.out", ios::out);
vector <pair<int, int> > v[nmax];
int n, m, nre, eu[mmax], ok=1, gr[nmax], viz[mmax];
void citire()
{
    int i, x, y;
    f1>>n>>m;
    for(i=1; i<=m; i++)
    {
        f1>>x>>y;
        v[x].push_back({y, i});
        v[y].push_back({x, i});
        if(x!=y) {gr[x]++; gr[y]++;}
    }
    for(i=1; i<=n; i++)
        if(gr[i]%2==1)
    {
        ok=0; break;
    }
}
void dfs(int nod)
{
    while(v[nod].size()>0)
    {
        int vec=v[nod].back().first, ind=v[nod].back().second;
        v[nod].pop_back();
        if(!viz[ind])
        {
            viz[ind]=1;
            dfs(vec);
        }
    }
    nre++; eu[nre]=nod;
}
void afis()
{
    int i;
    for(i=1; i<nre; i++)
        f2<<eu[i]<<' ';
}
int main()
{
    citire();
    if(ok)
    {
        dfs(1);
        afis();
    }
    else f2<<-1;
    return 0;
}