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Cod sursa(job #500588)
#include<stdio.h>
#include<string.h>
#include<vector>
using namespace std;
int nr,x,y,i,m,n;
bool ok[1000001];
vector <int> a[100001];
void dfs(int q)
{
vector <int>::iterator it;
printf("%d ",q);
ok[q]=true;
for (it=a[q].begin();it!=a[q].end();it++)
if(!ok[*it]) dfs(*it);
}
int main()
{
freopen("sortaret.in","r",stdin);
freopen("sortaret.out","w",stdout);
scanf("%d%d",&n,&m);
for (i=1;i<=m;i++)
{
scanf("%d%d",&x,&y);
a[x].push_back(y);
a[y].push_back(x);
}
memset(ok,false,sizeof(bool));
for (i=1;i<=n;i++)
{
if (ok[i]==false)
dfs(i);
}
return 0;
}