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#include <fstream>
using namespace std;
ifstream f("bfs.in"); ofstream g("bfs.out");
int n,m,x,a[101][101],viz[101],q[101];
int main()
{
f>>n>>m>>x;
for(int i=1; i<=m; i++)
{
int x,y; f>>x>>y;
a[x][y]=a[y][x]=1;
}
int st,dr,y;
q[1]=x; viz[x]=1; st=dr=1;
while(st<=dr)
{
y=q[st];
for(int j=1; j<=n; j++)
if(a[y][j] and !viz[j])
{
viz[j]=1;
q[++dr]=j;
}
st++;
}
for(int i=1; i<=dr; i++)
g<<q[i]<<' ';
return 0;
}