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Cod sursa(job #502887)
#include <algorithm>
#include <iostream>
using namespace std;
int n,m,s,v[2][100],a[100][100],i,j,st,dr,uz[100],coada[100],dist[100],start;
int main()
{
freopen ("bfs.in", "r", stdin);
freopen("bfs.out","w", stdout);
cin>>n;
cin>>m;
cin>>s;
for(i=1;i<=m;i++)
{
int x,y;
cin>>x>>y;
a[x][y]=1;
}
for(i=1;i<=m;i++)
dist[i]=-1;
coada[1] = s;
uz[s] = 1;
st = dr = 1;
dist[s ] = 0;
while ( st<=dr)
{
for ( i = 1; i <=n ; i ++ )
if ( a[ coada[st] ] [i] && !uz[i] )
{
dist[i] = dist[ coada[st] ] + 1;
dr++;
coada[dr] = i;
uz[i] = 1;
}
st++;
}
for ( i = 1; i<=n; i++)
cout<<dist[i]<<" ";
return 0;
}