Cod sursa(job #2243256)

Utilizator peterstStegarus Petre peterst Data 20 septembrie 2018 10:40:11
Problema BFS - Parcurgere in latime Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.83 kb
#include <fstream>
#include <vector>
#include <queue>
#define nmax 100002
using namespace std;

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

int n,m,s,x,y,vizitat[nmax],k;
vector<int> v[nmax];
queue<int> q;

void bfs()
{
    int u;
    q.push(s);
    vizitat[s]=0;
    while(!q.empty())
    {
        u=q.front();
        q.pop();
        for(vector<int>::iterator it=v[u].begin(); it!=v[u].end(); it++)
            if(vizitat[*it]==-1)
            {
                vizitat[*it]=vizitat[u]+1;
                q.push(*it);
            }
    }
}

int main()
{
    fin>>n>>m>>s;
    for(int i=0; i<m; ++i)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    for(int i=1; i<=n; ++i)
        vizitat[i]=-1;

    bfs();

    for(int i=1; i<=n; ++i)
        fout<<vizitat[i]<<" ";
    return 0;
}