Cod sursa(job #864041)

Utilizator acomAndrei Comaneci acom Data 24 ianuarie 2013 16:59:25
Problema BFS - Parcurgere in latime Scor 50
Compilator cpp Status done
Runda Arhiva educationala Marime 0.84 kb
#include<fstream>
#include<queue>
#include<bitset>
using namespace std;
#define nmax 100001
ifstream fin("bfs.in");
ofstream fout("bfs.out");
queue <int> q;
int a[nmax][1001];
int n,m,s,x,viz[nmax],i;

void citire()
{
    int i,x,y,k;
    fin>>n>>m>>s;
    for (i=1;i<=m;++i)
    {
        fin>>x>>y;
        k=a[x][0];
        a[x][k+1]=y;
        a[x][0]= k+1;
    }
}
void bfs(int z)
{
    int i,x,v;
    viz[z]=1;
    q.push(z);
    while (!q.empty())
    {
        x=q.front(); q.pop();
        for (i=1;i<=a[x][0];++i)
        {
            v=a[x][i];
            if (viz[v]==0)
            {
                q.push(v);
                viz[v]=viz[x]+1;
            }
        }
    }
}
int main()
{
    citire();
    bfs(s);
    for (i=1;i<=n;++i)
        fout<<viz[i]-1<<' ';
    fout<<'\n';
    return 0;
}