Cod sursa(job #1371784)

Utilizator Vladut-Vlad Panait Vladut- Data 4 martie 2015 03:24:16
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.84 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=0; i<n; i++)
        visited[i]=0;

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

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

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