Cod sursa(job #1572722)

Utilizator AdrianVrAdrian Stefan Vramulet AdrianVr Data 19 ianuarie 2016 05:28:03
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.79 kb
#include <fstream>
#include <vector>
#include <queue>
#define Nmax 100010
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
vector <int> A[Nmax];
queue <int> coada;
int n,m,s,x,y,cost[Nmax],i,j;
void BFS(int s)
{
    int p;
    for(i=1; i<=n; i++)
        cost[i]=-1;
    coada.push(s);
    cost[s]=0;
    while(coada.empty()==0)
    {
        p=coada.front();
        for(i=0; i<A[p].size(); i++)
            if(cost[A[p][i]]==-1)
            {
                coada.push(A[p][i]);
                cost[A[p][i]]=cost[p]+1;
            }
        coada.pop();
    }
}
int main()
{
    f>>n>>m>>s;
    for(i=1; i<=m; i++)
    {
        f>>x>>y;
        A[x].push_back(y);
    }
    BFS(s);
    for(i=1; i<=n; i++)
        g<<cost[i]<<' ';
    return 0;
}