Pagini recente » Algoritmiada 2012 - Clasament general, Clasele 11-12 | Cod sursa (job #176883) | Profil cotoarbalavinia | Sedinta 2008-04-11 | Cod sursa (job #463043)
Cod sursa(job #463043)
#include <iostream>
#include <fstream>
using namespace std;
struct nod{
int info;
nod *next;
} *vecini[100005];
int n,m,s,c[100005],viz[100005],t[100005];
void add(nod *&prim, int val)
{
nod *p=new nod;
p->info=val;
p->next=prim;
prim=p;
}
void citire()
{
int i,x,y;
ifstream f("bfs.in");
f>>n>>m>>s;
for(i=1;i<=m;i++)
{
f>>x>>y;
add(vecini[x],y);
}
f.close();
}
void bfs()
{
int i,k=1;
nod *p;
c[1]=s;
viz[s]=1;
for(i=1;i<=k;i++)
for(p=vecini[c[i]];p;p=p->next)
if(!viz[p->info])
{
c[++k]=p->info;
t[p->info]=c[i];
viz[p->info]=1;
}
}
void afisare()
{
int i,j,nr;
ofstream g("bfs.out");
for(i=1;i<=n;i++)
if(viz[i])
{
j=i;nr=0;
while(j)
nr++, j=t[j];
g<<nr-1<<" ";
}
else
g<<"-1 ";
g<<"\n";
g.close();
}
int main()
{
citire();
bfs();
afisare();
return 0;
}