Pagini recente » Cod sursa (job #1276078) | Cod sursa (job #167499) | Cod sursa (job #2425449) | Cod sursa (job #2684178) | Cod sursa (job #2105955)
#include <bits/stdc++.h>
#define NMAX 100001
#define INF 1<<30
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector<int> G[NMAX];
int n, m, S, a, b;
int V[NMAX];
bool use[NMAX];
queue<int> Q;
void BFS() {
while(!Q.empty()) {
int node = Q.front();
Q.pop();
for(int i = 0; i < G[node].size(); i++) {
if(!use[G[node][i]]) {
V[G[node][i]] = V[node] + 1;
Q.push(G[node][i]);
use[G[node][i]] = 1;
}
}
}
}
int main()
{
fin >> n >> m >> S;
while(m--) {
fin >> a >> b;
G[a].push_back(b);
}
Q.push(S);
use[S] = 1;
BFS();
for(int i = 1; i <= n; i++) {
if(i == S) fout << 0 << ' ';
else if(V[i] == 0) fout << -1 << ' ';
else fout << V[i] << ' ';
}
return 0;
}