Cod sursa(job #1430958)

Utilizator sanzianaioneteIonete Sanziana sanzianaionete Data 8 mai 2015 22:22:16
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.79 kb
#include<fstream>
#include<queue>
#include<vector>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int n,m,s,viz[100002];
vector <int> a[100002];
queue <int> c;
int main()
{
    f>>n>>m>>s;
    for(int i=0;i<m;i++)
    {
        int x,y;
        f>>x>>y;
        a[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
        viz[i]=-1;
    viz[s]=0;
    c.push(s);
    while(!c.empty())
    {
        int l=a[c.front()].size();
        for(int i=0;i<l;i++)
        {
            if(viz[a[c.front()][i]]==-1)
            {
                c.push(a[c.front()][i]);
                viz[a[c.front()][i]]=viz[c.front()]+1;
            }
        }
        c.pop();
    }
    for(int i=1;i<=n;i++)
        g<<viz[i]<<' ';
    f.close();g.close();
    return 0;
}