Cod sursa(job #2783610)

Utilizator VipioanaMirea Oana Teodora Vipioana Data 14 octombrie 2021 19:35:02
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.67 kb
#include <fstream>
#include <vector>
#include <queue>

using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
const int N=1e5+1;
int n,m,s;
int d[N];
vector <int> a[N];
queue <int> q;

void bfs(int s) {
    q.push(s);
    d[s]=0;
    while(!q.empty()){
        int x=q.front();
        q.pop();
        for(int j:a[x]){
            if(d[j]==-1){
            d[j]=d[x]+1;
            q.push(j);
        }
        }
    }
}

int main() {
  f>>n>>m>>s;
  for(int i=1; i<=m; i++){
    int x,y;
    f>>x>>y;
    a[x].push_back(y);
  }
  for(int i=1; i<=n; i++)
    d[i]=-1;
  bfs(s);
  for(int i=1; i<=n; i++)
    g<<d[i]<<" ";
  return 0;
}