Cod sursa(job #2299039)

Utilizator natrovanCeval Marius natrovan Data 8 decembrie 2018 19:32:05
Problema Parcurgere DFS - componente conexe Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.84 kb
#include <fstream>
#include <iostream>
#include <list>
#include <queue>
#include <vector>

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

struct nod{
list<int> vecini;
} vf[100005];
queue<int>q;
int n,m,start,i,x,y,viz[100005];

void BFS(int v)
{
    int x;
    q.push(v);
    viz[v]=1;
    while(!q.empty())
    {
        x=q.front();
       for(list<int>::iterator it=vf[x].vecini.begin();it!=vf[x].vecini.end();++it)
            if(viz[*it]==0)
            {
                q.push(*it);
                viz[*it]=viz[x]+1;
            }

        q.pop();
    }

}
int main()
{
    fin>>n>>m>>start;
    for(i=1;i<=m;i++)
    {
        fin>>x>>y;
        vf[x].vecini.push_back(y);
    }

    BFS(start);

    for(i=1;i<=n;i++)
    {
        fout<<viz[i]-1<<' ';
    }
    return 0;
}