Pagini recente » Cod sursa (job #783258) | Cod sursa (job #2805213) | Cod sursa (job #1387361) | Cod sursa (job #2156298) | Cod sursa (job #2774801)
#include <bits/stdc++.h>
using namespace std;
int main()
{
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n, m, s;
fin >> n >> m >> s;
vector<vector<int>> gr(n + 1);
for (int i = 0; i < m; i++) {
int u, v;
fin >> u >> v;
gr[u].push_back(v);
}
vector<int> visited(n + 1);
vector<int> dist(n + 1);
auto bfs = [&](int s) {
queue<int> q;
visited[s] = 1;
q.push(s);
while (q.size() != 0) {
int node = q.front();
q.pop();
for (auto &x : gr[node]) {
if (visited[x] == 0) {
visited[x] = 1;
dist[x] = dist[node] + 1;
q.push(x);
}
}
}
};
bfs(s);
for (int i = 1; i <= n; i++) {
if (dist[i] == 0 && i != s)
dist[i] = -1;
fout << dist[i] << ' ';
}
fout << '\n';
return 0;
}