Cod sursa(job #1695831)

Utilizator oanaroscaOana Rosca oanarosca Data 27 aprilie 2016 20:43:36
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.62 kb
#include <fstream>
#include <queue>
#include <vector>

using namespace std;

vector <int> a[100001];
queue <int> q;
int n, m, s, i, x, y, sol[100001];

int main () {
  ifstream fi("bfs.in");
  ofstream fo("bfs.out");
  fi >> n >> m >> s;
  for (i = 1; i <= m; i++)
    fi >> x >> y, a[x].push_back(y);
  q.push(s);
  while (!q.empty()) {
    x = q.front(); q.pop();
    for (i = 0; i < a[x].size(); i++)
      if (not sol[a[x][i]] and a[x][i] != s)
        sol[a[x][i]] = sol[x]+1, q.push(a[x][i]);
  }
  for (i = 1; i <= n; i++)
    (sol[i] == 0 and i != s) ? fo << "-1 " : fo << sol[i] << ' ';
  return 0;
}