Cod sursa(job #1324071)

Utilizator bogdanllazar bogdan bogdanl Data 21 ianuarie 2015 19:34:01
Problema BFS - Parcurgere in latime Scor 50
Compilator cpp Status done
Runda Arhiva educationala Marime 1.05 kb
#include <iostream>
#include <vector>
#include <fstream>
#include <queue>

using namespace std;

vector<int> a[10001];
int n,m,s,nod;
queue <int> q;
int cost[100001];

ofstream g("bfs.out");

void bfs()
{
    int i;
    cost[s]=0;
    q.push(s);

    while(!q.empty())
    {
        nod=q.front();
        for(i=0;i<a[nod].size();i++)
        {

            if(cost[a[nod][i]]==-1)
               {

                cost[a[nod][i]]=cost[nod]+1;
                q.push(a[nod][i]);

               }


        }

        q.pop();



    }




}

void afisare()
{
    int i,j;

    for(i=1;i<=n;i++)
    {
        for(j=0;j<a[i].size();j++)
            cout<<a[i][j]<<" ";
            cout<<endl;
    }
}

int main()
{
    ifstream f("bfs.in");
    f>>n>>m>>s;
    int x,y,i;
    for(i=0;i<m;i++)
    {
        f>>x>>y;
        a[x].push_back(y);

    }


    for(i=1;i<=n;i++)
        cost[i]=-1;

    bfs();

    for(i=1;i<=n;i++)
        g<<cost[i]<<" ";
    //afisare();


    return 0;
}