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Cod sursa(job #705988)
#include <cstdio>
#include <list>
#include <queue>
#define NMax 100001
using namespace std;
typedef queue<long> qc;
typedef list<long>::iterator it;
list<long> li[NMax];
long k,n,m,i,x,y,ii,pas,S;
long viz[NMax];
void dfs(long i)
{
qc coada;
coada.push(i);
viz[i]=1;
while(!coada.empty())
{
ii=coada.front();
pas=viz[ii];
for(it i=li[ii].begin();i!=li[ii].end();i++)
if(pas+1<viz[*i]||viz[*i]==0)
{
coada.push(*i);
viz[*i]=pas+1;
}
coada.pop();
}
}
int main()
{
freopen("bfs.in","rt",stdin);
freopen("bfs.out","wt",stdout);
scanf("%ld %ld %ld",&n,&m,&S);
for(long i=1;i<=m;i++)
{
scanf("%ld %ld",&x,&y);
li[x].push_back(y);
}
dfs(S);
for(long i=1;i<=n;i++)
{
if(viz[i]==0)
printf("-1 ");
else
printf("%ld ",viz[i]-1);
}
printf("\n");
return 0;
}