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Cod sursa(job #399739)
#include <cstdio>
#include <vector>
using namespace std;
#define file_in "bfs.in"
#define file_out "bfs.out"
#define Nmax 101000
int n,m,s,p,u,i,d[Nmax],q[Nmax],nod,a,b;
vector<int> G[Nmax];
int main()
{
freopen(file_in,"r",stdin);
freopen(file_out,"w",stdout);
scanf("%d %d %d", &n, &m,&s);
while(m--)
{
scanf("%d %d", &a, &b);
G[a].push_back(b);
//G[b].push_back(a);
}
memset(d,-1,sizeof(d));
d[s]=0;
q[1]=s;
p=u=1;
while(p<=u)
{
nod=q[p++];
for (i=0;i<G[nod].size();++i)
if (d[G[nod][i]]==-1)
{
d[G[nod][i]]=d[nod]+1;
q[++u]=G[nod][i];
}
}
for (i=1;i<=n;++i)
printf("%d ", d[i]);
fclose(stdin);
fclose(stdout);
return 0;
}