Pagini recente » Cod sursa (job #1842901) | Cod sursa (job #2610875) | Cod sursa (job #442650) | Cod sursa (job #59817) | Cod sursa (job #3302533)
#include <bits/stdc++.h>
using namespace std;
vector <int> graph[100005];
int distances[100005];
void bfs(int source, int n) {
for (int i = 1; i <= n; ++i) {
distances[i] = n + 1; // INF
}
queue<int> q;
q.push(source);
distances[source] = 0;
while (!q.empty()) {
int node = q.front();
q.pop();
for (auto vecin : graph[node]) {
if (distances[vecin] > distances[node] + 1) {
distances[vecin] = distances[node] + 1;
q.push(vecin);
}
}
}
for (int i = 1; i <= n; ++i) {
if (distances[i] == n + 1) {
distances[i] = -1;
}
cout << distances[i] << " ";
}
}
int main()
{
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
int n, m, s;
cin >> n >> m >> s;
for (int i = 1; i <= m; ++i) {
int x, y;
cin >> x >> y;
graph[x].push_back(y);
}
bfs(s, n);
return 0;
}