Cod sursa(job #1361977)

Utilizator bianncaPoenar Bianca biannca Data 26 februarie 2015 08:40:00
Problema BFS - Parcurgere in latime Scor 50
Compilator cpp Status done
Runda Arhiva educationala Marime 0.86 kb
#include <iostream>
#include<vector>
#include<queue>
#include<fstream>
using namespace std;
ifstream fin("bfs.in");
ofstream gout("bfs.out");
vector<int> v[10005];
queue<int> q;
int viz[10005],len[10005];
int n,m,s;
void citire()
{
    int i,x,y;
    fin>>n>>m>>s;
    for(i=1;i<=m;i++)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
}
void bfs(int s)
{
    q.push(s);
    viz[s]=1;
    len[s]=0;
    while(!q.empty())
    {
        s=q.front();
        q.pop();
        for(int i=0;i<v[s].size();++i)
            if(viz[v[s][i]]==0)
        {
            viz[v[s][i]]=1;
            q.push(v[s][i]);
            len[v[s][i]]=len[s]+1;
        }

    }

}
int main()
{
    int i;
    citire();
    for(i=1;i<=n;i++)
        len[i]=-1;
        bfs(s);
    for(i=1;i<=n;i++)
        gout<<len[i]<<" ";
    return 0;
}