Pagini recente » Cod sursa (job #3255391) | Cod sursa (job #1629466) | Cod sursa (job #2356196) | Cod sursa (job #2968994) | Cod sursa (job #1918749)
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
ifstream fin ("bfs.in");
ofstream fout ("bfs.out");
const int maxn = 1e5 + 5;
vector <int> G[maxn];
int Dist[maxn];
void Bfs (int start, int n) {
queue <int> Q;
vector <int> :: iterator it;
int node, i;
for (i = 1; i <= n; i++) {
Dist[i] = -1;
}
Dist[start] = 0;
Q.push(start);
while (!Q.empty()) {
node = Q.front();
Q.pop();
for (it = G[node].begin(); it != G[node].end(); it++) {
if (Dist[*it] == -1) {
Dist[*it] = Dist[node] + 1;
Q.push(*it);
}
}
}
}
int main() {
ios_base :: sync_with_stdio (false);
int n, m, i, x, y, start;
fin >> n >> m >> start;
for (i = 1; i <= m; i++) {
fin >> x >> y;
G[x].push_back(y);
}
Bfs(start, n);
for (i = 1; i <= n; i++) {
fout << Dist[i] << " ";
}
return 0;
}