Cod sursa(job #1025780)

Utilizator macajouMaca George macajou Data 10 noiembrie 2013 15:53:00
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.2 kb
#include <cstdio>
#include <cstring>
#include <queue>

using namespace std;

struct nod
{
    int vf;
    nod *urm;
};

nod *l[100010];
int n,m,st,nr,pas[100010];

void adaug(nod *&pr, int x)
{
    nod *nou;
    nou=new nod;
    nou->vf=x;
    nou->urm=pr;
    pr=nou;
}

void citire()
{
    int i,x,y;
    scanf("%d%d%d",&n,&m,&st);
    for(i=1;i<=m;i++)
        {
            scanf("%d%d",&x,&y);
            adaug(l[x],y);
        }
}

void BFS()
{
    queue<int> q;
    q.push(st);
    int p,v;
    nod *c;
    while(!q.empty())
          {
              p=q.front();
              q.pop();
              c=l[p];
              while(c)
                    {
                        if(pas[c->vf]==-1)
                           {
                               q.push(c->vf);
                               pas[c->vf]=pas[p]+1;
                           }
                        c=c->urm;
                    }
          }
}

int main()
{
    freopen("bfs.in","r",stdin);
    freopen("bfs.out","w",stdout);

    citire();
    memset(pas,-1,sizeof(pas));
    pas[st]=0;
    BFS();
    for(int i=1;i<=n;i++)
        printf("%d ",pas[i]);

    return 0;
}