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119 lines
2.6 KiB

package main
import (
"../lib"
"./correct"
"./student"
)
func parentListDelete(root *student.TreeNode) string {
if root == nil {
return ""
}
var parent string
if root.Parent == nil {
parent = "nil"
} else {
parent = root.Parent.Data
}
r := "Node: " + root.Data + " Parent: " + parent + "\n"
r += parentListDelete(root.Left) + parentListDelete(root.Right)
return r
}
func FormatTree_delete(root *student.TreeNode) string {
if root == nil {
return ""
}
res := root.Data + "\n"
res += formatSubTree_delete(root, "")
return res
}
func formatSubTree_delete(root *student.TreeNode, prefix string) string {
if root == nil {
return ""
}
var res string
hasLeft := root.Left != nil
hasRight := root.Right != nil
if !hasLeft && !hasRight {
return res
}
res += prefix
if hasLeft && hasRight {
res += "├── "
}
if !hasLeft && hasRight {
res += "└── "
}
if hasRight {
printStrand := (hasLeft && hasRight && (root.Right.Right != nil || root.Right.Left != nil))
newPrefix := prefix
if printStrand {
newPrefix += "│ "
} else {
newPrefix += " "
}
res += root.Right.Data + "\n"
res += formatSubTree_delete(root.Right, newPrefix)
}
if hasLeft {
if hasRight {
res += prefix
}
res += "└── " + root.Left.Data + "\n"
res += formatSubTree_delete(root.Left, prefix+" ")
}
return res
}
func errorMessage_delete(fn interface{}, deleted string, rootOr, root *correct.TreeNode, rootS *student.TreeNode) {
lib.Fatalf("%s(\n%s, %s\n) ==\n%s instead of\n%s\n",
"BTreeDeleteNode",
correct.FormatTree(rootOr),
deleted,
FormatTree_delete(rootS),
correct.FormatTree(root),
)
}
func CompareTrees_delete(fn interface{}, deleted string, rootOr, root *correct.TreeNode, rootS *student.TreeNode) {
sel := student.BTreeSearchItem(rootS, deleted)
if !student.BTreeIsBinary(rootS) || sel != nil {
errorMessage_delete(fn, deleted, rootOr, root, rootS)
}
}
func main() {
root := &correct.TreeNode{Data: "04"}
rootS := &student.TreeNode{Data: "04"}
rootOr := &correct.TreeNode{Data: "04"}
ins := []string{"01", "07", "05", "12", "02", "03", "10"}
for _, v := range ins {
root = correct.BTreeInsertData(root, v)
rootS = student.BTreeInsertData(rootS, v)
rootOr = correct.BTreeInsertData(rootOr, v)
}
selected := correct.BTreeSearchItem(root, "04")
selectedS := student.BTreeSearchItem(rootS, "04")
root = correct.BTreeDeleteNode(root, selected)
rootS = student.BTreeDeleteNode(rootS, selectedS)
fn := interface{}(correct.BTreeDeleteNode)
CompareTrees_delete(fn, selected.Data, rootOr, root, rootS)
}