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package main
import "fmt"
type ListNode struct {
Val int
Next *ListNode
}
func create(e int) *ListNode {
return &ListNode{
Val: e,
Next: nil,
}
}
func (ln *ListNode) add(e int) *ListNode {
newNode := ListNode{
Val: e,
Next: nil,
}
tmp := ln
for tmp.Next != nil {
tmp = tmp.Next
}
tmp.Next = &newNode
return ln
}
func (ln *ListNode) display() {
tmp := ln
fmt.Print("ListNodes:")
for tmp != nil {
fmt.Printf(" %d", tmp.Val)
tmp = tmp.Next
}
fmt.Println()
}
func removeElements(head *ListNode, val int) *ListNode {
// copy the head
s := head
// pre node
pre := s
// current node index of ListNode
c := 0
for s != nil {
if s.Val == val {
// when the delete target node is head
if c == 0 {
head = head.Next
s = head
pre = s
c--
} else {
// when the delete target node is not head
pre.Next = s.Next // delete the target node
s = s.Next // move to next node
}
} else {
// move the pointer to next node
pre = s
s = s.Next
}
c++
}
return head
}
func main() {
s := create(7).add(7).add(7).add(7).add(7)
// s := create(1)
s = removeElements(s, 7)
s.display()
}
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