func getMinDistanceAndUnselectedNode(distanceMap map[*Node]int, selectedMap map[*Node]void) *Node {
var minNode *Node
minDistance := math.MaxInt64
for node, distance := range distanceMap {
if _, exist := selectedMap[node]; !exist && distance < minDistance {
minNode = node
}
}
return minNode
}
func dijkstra(head *Node) map[*Node]int {
distanceMap := make(map[*Node]int, 32)
distanceMap[head] = 0
selectedMap := make(map[*Node]void, 32)
minNode := getMinDistanceAndUnselectedNode(distanceMap, selectedMap)
for minNode != nil {
distance := distanceMap[minNode]
for _, edge := range minNode.edges {
toNode := edge.to
if _, exit := distanceMap[toNode]; !exit {
distanceMap[toNode] = distance + edge.weitht
} else {
distanceMap[toNode] = int(math.Min(float64(distanceMap[toNode]), float64(distance+edge.weitht)))
}
}
selectedMap[minNode] = void{}
minNode = getMinDistanceAndUnselectedNode(distanceMap, selectedMap)
}
return distanceMap
}
func main() {
arr := [][]int{{1, 2, 1}, {2, 1, 1}, {1, 3, 2}, {3, 1, 2}, {2, 3, 3}, {3, 2, 3}}
graph := NewGraph(arr)
ret := kruskalMST(graph)
fmt.Println(ret)
}
dijkstra
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