Cod sursa(job #367881)
# include <fstream>
# include <iostream>
using namespace std;
# define MAX 100001
int n, *a[MAX], d[100001], s;
void read ()
{
ifstream fin ("bfs.in");
int m;
fin>>n>>m>>s;
int *grad=new int [n+1];
for (int i=1;i<=n;i++)
grad[i]=0, d[i]=-1;
for (;m;m--)
{
int i, j;
fin>>i>>j;
grad[i]++;
}
fin.close ();
fin.open("bfs.in");
fin>>n>>m>>s;
for (int i=1;i<=n;i++)
{
a[i]=new int [grad[i]+1];
a[i][0]=0;
}
delete [] grad;
for (;m;m--)
{
int i, j;
fin>>i>>j;
a[i][++a[i][0]]=j;
}
}
void bfs ()
{
int *coada=new int [n+1], st=1, dr=1, k, i;
coada[st]=s;
d[s]=0;
while (st<=dr)
{
k=coada[st++];
for (i=1;i<=a[k][0];i++)
if (d[a[k][i]]==-1)
{
coada[++dr]=a[k][i];
d[a[k][i]]=d[k]+1;
}
}
}
void write ()
{
ofstream fout ("bfs.out");
for (int i=1;i<=n;i++)
fout<<d[i]<<" ";
}
int main ()
{
read ();
bfs ();
write ();
return 0;
}