Cod sursa(job #2337522)

Utilizator BotzkiBotzki Botzki Data 6 februarie 2019 15:09:53
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.79 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
const int NMAX=100000;
int viz[NMAX+5];
vector <int>G[NMAX+5];
queue <int>q;
void BFS(int nod)
{
    int i;
    viz[nod]=1;
    q.push(nod);
    while(!q.empty())
    {
        nod=q.front();
        q.pop();
        for(i=0;i<G[nod].size();i++)
        {
            if(viz[G[nod][i]]==0)
            {
               viz[G[nod][i]]=viz[nod]+1;
               q.push(G[nod][i]);
            }
        }
    }
}
int main()
{
    int n, m, i, s, x, y;
    fin>>n>>m>>s;
    for(i=1;i<=m;i++)
    {
        fin>>x>>y;
        G[x].push_back(y);
    }
    BFS(s);
    for(i=1;i<=n;i++)
       fout<<viz[i]-1<<" ";
    fout<<"\n";
    return 0;
}