Cod sursa(job #1782288)

Utilizator ggaaggaabbiigoteciuc gabriel ggaaggaabbii Data 17 octombrie 2016 22:06:42
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.83 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
#define MAXN 100010
vector <int> G[MAXN];
queue <int> Q;
int dist[MAXN],n,m,x,y,pct;
ifstream f("bfs.in");
ofstream g("bfs.out");
void bfs(int nod)
{
    int aux;
    for(int i=1; i<=n; i++)
        dist[i]=-1;
    dist[nod]=0;
    Q.push(nod);
    while(Q.size())
    {
        aux=Q.front();
        Q.pop();
        for(int i=0; i<G[aux].size(); i++)
        {
            if(dist[G[aux][i]]==-1)
            {
                Q.push(G[aux][i]);
                dist[G[aux][i]]=dist[aux]+1;
            }
        }
    }
}
int main()
{
    f>>n>>m>>pct;
    while(m--)
    {
        f>>x>>y;
        G[x].push_back(y);
    }
    bfs(pct);
    for(int i=1; i<=n; i++)
        g<<dist[i]<<' ';
    return 0;
}