Cod sursa(job #741416)

Utilizator SpiriFlaviuBerbecariu Flaviu SpiriFlaviu Data 25 aprilie 2012 23:07:07
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.87 kb
#include <fstream>
#include <queue>

using namespace std;

ifstream fin("bfs.in");
ofstream fout("bfs.out");

vector<int> v[100001];

queue<int> q;

bool visited[100001];

int main()
{
    int n,m,s,x,y;
    int drum[100001];
    fin>>n>>m>>s;
    for(int i=1;i<=n;i++)
        drum[i]=-1;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    visited[s]=true;
    q.push(s);
    drum[s]=0;
    while(!q.empty())
    {
        x=q.front();
        for(int i=0;i<v[x].size();i++)
            if(!visited[v[x][i]])
            {
                q.push(v[x][i]);
                drum[v[x][i]]=drum[x]+1;
                visited[v[x][i]]=true;
            }
        q.pop();
    }
    for(int i=1;i<=n;i++)
        fout<<drum[i]<<' ';
    fout<<'\n';





    fin.close();
    fout.close();
    return 0;
}