Cod sursa(job #2342531)

Utilizator SamySam2099Irsai Samuel SamySam2099 Data 12 februarie 2019 21:29:27
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.83 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;

ifstream f("bfs.in");
ofstream g("bfs.out");
#define Nmax 100005

vector <int> G[Nmax];
queue <int> Q;

int n,m,s,D[Nmax];

void read()
{
    f>>n>>m>>s;
    for(int i=1;i<=m;i++)
    {
        int x,y;
        f>>x>>y;
        G[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
        D[i]=-1;
    D[s]=0;
}
void bfs()
{
    Q.push(s);
    while(!Q.empty())
    {
       int nod=Q.front();
        Q.pop();
        for(int i=0;i<G[nod].size();i++)
        {
           int vecin=G[nod][i];
           if(D[vecin]==-1)
           {
               Q.push(vecin);
               D[vecin]=D[nod]+1;
            }
        }
    }
}
int main()
{

  read();
  bfs();
  for(int i=1;i<=n;i++)
      g<<D[i]<<' ';
  return 0;
}