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Cod sursa(job #556656)
#include <fstream>
#include <vector>
#include <queue>
#define max 100001
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <int> a[max];
queue <int> q;
char viz[max];
int d[max],n,m,k;
int main()
{
int i,h1,h2,w;
fin>>n>>m>>k;
for (i=1;i<=m;i++)
{
fin>>h1>>h2;
a[h1].push_back(h2);
}
q.push(k); viz[k]=1;
while (!q.empty())
{
w=q.front(); q.pop();
for (i=0;i<a[w].size();i++)
if (viz[a[w][i]]==0)
{
viz[a[w][i]]=1;
d[a[w][i]]=d[w]+1;
q.push(a[w][i]);
}
}
for (i=1;i<=n;i++)
if (d[i]==0 && i!=k) fout<<-1<<' ';
else fout<<d[i]<<' ';
fout.close();
return 0;
}