Cod sursa(job #2910778)

Utilizator KarinaDKarina Dumitrescu KarinaD Data 24 iunie 2022 23:43:23
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.73 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

ifstream fin( "bfs.in" );
ofstream fout( "bfs.out" );

const int MAX_N = 1e5;

vector <int> g[MAX_N + 1];
int dist[MAX_N + 1];
queue <int> q;

int main() {

  int n, m, i, s;

  fin >> n >> m >> s;

  for ( i = 0; i < m; i++ ) {
      
    int a, b;
    fin >> a >> b;

    g[a].push_back(b);
  }

  q.push (s);
  dist[s] = 1;
    
  while ( q.size () > 0 ){
      
    int x = q.front();
    q.pop ();
      
    for ( i = 0; i < g[x].size (); i++ ){
      if ( dist[g[x][i]] == 0 ){
        dist[g[x][i]] = dist[x] + 1;
        q.push ( g[x][i] );
      }
    }
  }

  for ( i = 1; i <= n; i++ )
    fout << dist[i] - 1 << ' ';


  return 0;
}