Cod sursa(job #2534158)

Utilizator Theo20067Cismaru Theodor-Alexe Theo20067 Data 30 ianuarie 2020 10:03:55
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.92 kb
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream fin ("bfs.in");
ofstream fout("bfs.out");
int n,m,s,b,a;
int c[100005],d[100005];
vector <int> V[100005];
void bfs(int start)
{
      int st=1,dr=1,nod,vecin;
      c[st]=start;
      d[start]=0;
      while(st<=dr)
      {
            nod=c[st];
            for(int i=0;i<V[nod].size(); i++)
            {
                  vecin=V[nod][i];
                  if(d[vecin] == -1)
                  {
                        dr++;
                        c[dr]=vecin;
                        d[vecin]=d[nod]+1;
                  }
            }
            st++;
      }
}

int main()
{
    fin>>n>>m>>s;
    for(int i=1;i<=n;i++)
        d[i]=-1;
    for(int i=1;i<=m;i++)
    {
        fin>>a>>b;
        V[a].push_back(b);
    }
    bfs(s);
    for(int i=1;i<=n;i++)
        fout<<d[i]<<" ";
    return 0;
}