Pagini recente » Cod sursa (job #1758165) | Cod sursa (job #809519) | Cod sursa (job #3169541) | Cod sursa (job #2210732) | Cod sursa (job #1705048)
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
#define NMAX 100001
using namespace std;
vector<int> adjList[NMAX];
int dist[NMAX];
int parent[NMAX];
int n, m, s;
void BFS(int root) {
for (int i = 1; i <= n; ++i) {
dist[i] = -1;
parent[i] = -1;
}
dist[root] = 0;
queue<int> Q;
Q.push(root);
while(!Q.empty()) {
int nod = Q.front();
Q.pop();
for (int i = 0; i < adjList[nod].size(); ++i) {
if (dist[adjList[nod][i]] == -1) {
dist[adjList[nod][i]] = dist[nod] + 1;
parent[adjList[nod][i]] = nod;
Q.push(adjList[nod][i]);
}
}
}
}
int main() {
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
int a, b;
cin >> n >> m >> s;
for (int i = 0; i < m; ++i) {
cin >> a >> b;
adjList[a].push_back(b);
}
BFS(s);
for(int i = 1; i <=n; ++i) {
cout << dist[i] << " ";
}
}