func ShortestPath(g *graph.UnGraph, source graph.VertexId) map[graph.VertexId]graph.VertexId {
visited := make(map[graph.VertexId]bool, g.VerticesCount())
dist := make(map[graph.VertexId]int)
prev := make(map[graph.VertexId]graph.VertexId)
Q := pq.NewMin()
vertices := g.VerticesIter()
dist[source] = 0
for vertex := range vertices {
if source != vertex {
dist[vertex] = 1000
prev[vertex] = 0
}
Q.Insert(*pq.NewItem(vertex, dist[vertex]))
}
for Q.Len() > 0 {
u := Q.Extract().Value.(graph.VertexId)
visited[u] = true
for neighbour := range g.GetNeighbours(u).VerticesIter() {
if !visited[neighbour] {
alt := dist[u] + g.GetEdge(u, neighbour)
if alt < dist[neighbour] {
dist[neighbour] = alt
prev[neighbour] = u
Q.ChangePriority(neighbour, alt)
}
}
}
}
return prev
}
func UndirectedDfs(g *graph.UnGraph, v graph.VertexId, fn func(graph.VertexId)) {
s := stack.New()
s.Push(v)
visited := make(map[graph.VertexId]bool)
for s.Len() > 0 {
v := s.Pop().(graph.VertexId)
if _, ok := visited[v]; !ok {
visited[v] = true
fn(v)
neighbours := g.GetNeighbours(v).VerticesIter()
for neighbour := range neighbours {
s.Push(neighbour)
}
}
}
}
