Pagini recente » Cod sursa (job #1566957) | Cod sursa (job #120583) | Cod sursa (job #153774) | Cod sursa (job #2059761) | Cod sursa (job #2256359)
#include <fstream>
#include <queue>
#include <vector>
#define NMAX 100005
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
queue <int> q;
vector <int> v[NMAX];
int cost[NMAX];
bool viz[NMAX];
int n, m, s, i, x, y, inc, sf;
int main() {
fin >> n >> m >> s;
for (i=1; i<=m; i++)
{
fin >> x >> y;
v[x].push_back(y);
}
q.push(s);
viz[s] = true;
cost[s]=0;
while (!q.empty())
{
inc = q.front();
int nrvecini = v[inc].size();
for (i=0; i<nrvecini; i++)
{
if (!viz[v[inc][i]])
{
viz[v[inc][i]] = true;
q.push(v[inc][i]);
sf = q.back();
cost[sf] = cost[inc]+1;
}
}
q.pop();
}
for (i=1; i<=n; i++)
{
if (!viz[i])
fout << "-1 ";
else
fout << cost[i] << " ";
}
return 0;
}