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Cod sursa(job #991473)
# include <cstdio>
# include <queue>
# include <vector>
# define pb push_back
using namespace std;
int n,m,s,i,viz[100001],x,y;
queue <int>q;
vector <int>G[100001];
void bfs(int x)
{
int i;
q.push(x);viz[x]=1;
while(!q.empty())
{
x=q.front(); q.pop();
for(i=0;i<G[x].size();++i)
{
if(!viz[G[x][i]])
{
q.push(G[x][i]);
viz[G[x][i]]=viz[x]+1;
}
}
}
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d%d%d",&n,&m,&s);
for(i=1;i<=m;++i)
{
scanf("%d%d",&x,&y);
G[x].pb(y);
}
bfs(s);
for(i=1;i<=n;++i)
printf("%d ",viz[i]-1);
printf("\n");
return 0;
}