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优化 707设计链表 addAtIndex

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wz-mibookwindows
2021-08-07 11:04:11 +08:00
parent cb65921f6c
commit 91c6ecdee9
1 changed files with 5 additions and 4 deletions
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9
problems/0707.设计链表.md
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@ -917,16 +917,17 @@ class MyLinkedList {
} }
fun addAtIndex(index: Int, `val`: Int) { fun addAtIndex(index: Int, `val`: Int) {
if (index == 0) return addAtHead(`val`)
if (index == size) return addAtTail(`val`)
if (index > size) return if (index > size) return
var cur = this.next val pre = ListNode(0)
for (i in 0 until index - 1) { pre.next = this.next
var cur:ListNode? = pre
for (i in 0 until index) {
cur = cur?.next cur = cur?.next
} }
val temp = cur?.next val temp = cur?.next
cur?.next = ListNode(`val`) cur?.next = ListNode(`val`)
cur?.next?.next = temp cur?.next?.next = temp
this.next = pre.next
size++ size++
} }