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#include<fstream>
#include<vector>
using namespace std;
vector<unsigned int> t[50000];
bool r[50000];
ofstream g("sortaret.out");
void megy(int j)
{
r[j]=1;
g<<j<<" ";
/*vector<unsigned int>::iterator it;
it=t[j].begin();
while(it!=t[j].end())
{
if(r[*it]==0)
megy(*it);
it++;
}*/
for(auto&i:t[j])
if(!r[i])
megy(i);/*
for each (unsigned int i in t[j])
if(!r[i])
megy(i);*/
}
int main()
{
vector<unsigned int>::iterator it;
ifstream f("sortaret.in");
unsigned int i,n,m,a,b;
f>>n>>m;
for(i=1;i<=m;i++)
{
f>>a>>b;
t[a].push_back(b);
t[b].push_back(a);
}
for(i=1;i<=n;i++)
{
if(r[i]==0)
{
megy(i);
}
}
f.close();
g.close();
return 0;
}