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Cod sursa(job #857022)
#include <fstream>
#include<vector>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int s,n,m,x[100003],d[100003],p[100003];
vector<int>v[1000000];
void Read()
{
int x,y;
fin>>n>>m>>s;
for(int i=1 ; i<=m ; i++)
{
fin>>x>>y;
v[x].push_back(y);
}
}
void bf(int s)
{
int i,st,dr,j;
st=dr=1;
x[1]=s;
p[s]=1;
d[s]=0;
while(st<=dr)
{
for(i=0 ; i < v[x[st]].size() ; i++)
{
j = v[x[st]][i];
if(!p[j])
{
dr++;
x[dr]=j;
p[j]=1;
d[j] = d[x[st]] +1;
}
}
st++;
}
}
int main()
{
Read();
bf(s);
for(int i=1 ; i<=n ; i++)
{
if(d[i] || i==s)
fout<<d[i]<< " ";
else if(d[i]==0 && i!=s)
fout<<-1<<" ";
}
fin.close();
fout.close();
return 0;
}