Cod sursa(job #1374271)

Utilizator Vladut-Vlad Panait Vladut- Data 5 martie 2015 01:38:07
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.85 kb
#include <queue>
#include <fstream>
#include <vector>
#define maxn 100005

using namespace std;

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

int n, m, s, x, y, visited[maxn], p;

queue <int> q;
vector <int> g[maxn];

int main()
{
    fin >> n >> m >> s;

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

    for(int i=0; i<m; i++)
    {
        fin >> x >> y;
        g[x].push_back(y);
    }
   q.push(s);
   visited[s]=0;
   while(!q.empty())
   {
       p=q.front();
       q.pop();
       for(int i=0; i<g[p].size(); i++)
       {
           if(visited[g[p][i]]==-1)
            {
                visited[g[p][i]]=visited[p]+1;
                q.push(g[p][i]);
            }
       }
   }

    for(int i=1; i<=n; i++)
        fout << visited[i] << ' ';

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