Pagini recente » Cod sursa (job #1146632) | Cod sursa (job #2568947) | Cod sursa (job #7646) | Cod sursa (job #1638206) | Cod sursa (job #1443599)
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int N, M, K;
vector < vector <int> > Graf;
vector <int> Dist;
queue <int> Q;
void BFS(int nod);
int main() {
fin >> N >> M >> K;
int x, y;
Graf.resize(N + 1);
Dist.resize(N + 1);
for(int i = 1; i <= M; ++i) {
fin >> x >> y;
Graf[x].push_back(y);
}
BFS(K);
for(int i = 1; i <= N; ++i) {
if(i == K) fout << 0 << ' ';
else {
fout << (Dist[i] > 0 ? Dist[i] : -1) << ' ';
}
}
fout << '\n';
fin.close();
fout.close();
return 0;
}
void BFS(int nod) {
Q.push(nod);
while(!Q.empty()) {
nod = Q.front();
Q.pop();
for(auto x : Graf[nod]) {
if(!Dist[x] && x != K) {
Dist[x] = Dist[nod] + 1;
Q.push(x);
}
}
}
}