remove_nth_node
remove_nth_node.go 源码
package main
//删除链表倒数第N个节点
//先计数，再依次遍历
func removeNthFromEnd1(head *ListNode, n int) *ListNode {
dummy := ListNode{0, head}
cur := &dummy
length := getLength(head)
for i := 1; i < length-n+1; i++ {
cur = cur.Next
}
cur.Next = cur.Next.Next
return dummy.Next
}
func getLength(head *ListNode) int {
n := 0
for head != nil {
n, head = n+1, head.Next
}
return n
}
//快慢指针，一次遍历
func removeNthFromEnd2(head *ListNode, n int) *ListNode {
dummy := ListNode{0, head}
slow, fast := &dummy, head
for i := 0; i < n; i++ {
fast = fast.Next
}
for fast != nil {
slow, fast = slow.Next, fast.Next
}
slow.Next = slow.Next.Next
return dummy.Next
}
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