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Cod sursa(job #729817)
#include<stdio.h>
#include<vector>
#include<queue>
#include<algorithm>
using namespace std;
vector<long long> v[100001];
long long t[100001];
queue<long long> q;
queue<long long> w;
long long n,m,s;
long long ki;
long long d;
long long i;
long long a,b;
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%lld%lld%lld",&n,&m,&s);
for(i=1;i<=m;i++)
{
scanf("%lld%lld",&a,&b);
v[a].push_back(b);
}
q.push(s);
w.push(0);
while(!q.empty())
{
ki=q.front();
d=w.front();
q.pop();
w.pop();
t[ki]=d;
vector<long long>::iterator it;
for(it=v[ki].begin();it!=v[ki].end();++it)
{
if(t[*it]==0&&*it!=s)
{
q.push(*it);
w.push(d+1);
}
}
}
for(i=1;i<=n;i++)
{
printf("%lld ", (t[i]==0?(i==s?0:-1):t[i]) );
}
return 0;
}