Cod sursa(job #1391314)

Utilizator ManuNNazare Emanuel ManuN Data 17 martie 2015 20:19:29
Problema BFS - Parcurgere in latime Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.96 kb
#include <iostream>
#include <vector>
#include <queue>
#include <fstream>
using namespace std;
int vz[100],viz[100],tata[100],a,m,n,e,b,c,x,y,k=0,j;
ifstream f("bfs.in");
ofstream g("bfs.out");
int main()
{
    int i;
    vector <long int> v[100];
    queue <long int> q;
    f>>n>>m>>a;
    for(i=1;i<=m;i++)
    {
        f>>e>>b;
        v[e].push_back(b);
    }
    q.push(a);
    viz[a]=1;
    while(q.size()>0)
    {
        x=q.front();
        q.pop();
        for(int i=0;i<v[x].size();i++)
            if(viz[v[x][i]]==0)
            {
                viz[v[x][i]]=1;
                q.push(v[x][i]);
                tata[v[x][i]]=x;
            }
    }
    for(i=1;i<=n;i++)
        if(viz[i])
        {
            j=i;
            k=0;
            while(tata[j])
            {
                k++;
                j=tata[j];
            }
            g<<k<<" ";
        }
        else
            g<<-1<<" ";
    return 0;
}