Cod sursa(job #2181821)

Utilizator al3xionescuIonescu Alexandru al3xionescu Data 21 martie 2018 21:08:07
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.6 kb
#include<queue>
#include<fstream>
#include<vector>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
queue<int>Q;
vector<int> v[100001];
int d[100005];
int n,m,s,x,y;
int main()
{ f>>n>>m>>s;
  for(int i=1;i<=m;i++){
    f>>x>>y;
    v[x].push_back(y);
  }
  Q.push(s);
  d[s]=1;
  while(!Q.empty()) {
    int nod = Q.front();
    Q.pop();
    for(int i=0;i<v[nod].size();i++) {
        int ngh=v[nod][i];
        if(d[ngh]==0) {
            d[ngh]=d[nod]+1;
            Q.push(ngh);
        }
    }
  }
  for(int i=1;i<=n;i++)
    g<<d[i]-1<<' ';
    return 0;
}