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Cod sursa(job #545590)
#include<cstdio>
#include<vector>
#include<deque>
using namespace std;
vector<int> v[100010];
int n,m,s,a,b,d[100010],i;
deque<int> q;
void read(),solve(),bfs();
int main()
{
read();
solve();
return 0;
}
void read()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d%d%d",&n,&m,&s);
for(;m;m--)
{
scanf("%d%d",&a,&b);
v[a].push_back(b);
}
}
void solve()
{
for(i=1;i<=n;i++)
d[i]=-1;
d[s]=0;
q.push_back(s);
bfs();
for(i=1;i<=n;i++)
printf("%d ",d[i]);
}
void bfs()
{
int crt;
vector<int>::iterator it;
for(;!q.empty();)
{
crt=q.front();
for(it=v[crt].begin();it!=v[crt].end();it++)
if(d[*it]==-1)
{
d[*it]=d[crt]+1;
q.push_back(*it);
}
q.pop_front();
}
}