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Cod sursa(job #616802)
#include <iostream>
#include <stdio.h>
using namespace std;
int nn,n,s,x,m[100000][1000],y,v[100100],i,j,k,d[1000100],a,b,u,p;
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d %d %d",&n,&nn,&s);
for (i=1;i<=nn;i++)
{
scanf("%d %d",&x,&y);
m[x][0]++;
m[x][m[x][0]]=y;
}
for (i=1;i<=n;i++)
v[i]=-1;
v[s]=0;
p=0;u=1;d[1]=s;
while (p<=u)
{
d[p]=0;
p++;
for (i=1;i<=m[d[p]][0];i++)
{
if (v[m[d[p]][i]]==-1)
{
u++;
d[u]=m[d[p]][i];
v[m[d[p]][i]]=v[d[p]]+1;
}
}
}
for (i=1;i<=n;i++)
printf("%d ",v[i]);
return 0;
}