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Cod sursa(job #956386)
#include <algorithm>
#include <cstdlib>
#include <fstream>
#include <iostream>
#include <queue>
#include <vector>
using namespace std;
int main()
{
ifstream fin ("bfs.in");
ofstream fout ("bfs.out");
int N, m, S;
fin >> N >> m >> S;
vector <vector <int>> G (N+1);
vector <int> dist (N+1, -1);
for (; m; --m)
{
int x, y;
fin >> x >> y;
G[x].push_back (y);
}
queue <int> vertices;
vertices.push (S);
dist[S] = 0;
while (!vertices.empty())
{
int v = vertices.front(); vertices.pop();
for (auto &n : G[v])
if (dist[n] == -1)
{
dist[n] = dist[v]+1;
vertices.push (n);
}
}
for (int v = 1; v <= N; ++v)
fout << dist[v] << ' ';
fout << '\n';
fin.close();
return EXIT_SUCCESS;
}