feat: add swift implementation to lcof2 problem: No.024 #3012

Original file line number	Diff line number	Diff line change
Expand Up		@@ -219,6 +219,38 @@ public class Solution {
		}
		```

	#### Swift

	```swift
	/**
	* Definition for singly-linked list.
	* public class ListNode {
	* public var val: Int
	* public var next: ListNode?
	* public init(_ val: Int) {
	* self.val = val
	* self.next = nil
	* }
	* }
	*/

	class Solution {
	func reverseList(_ head: ListNode?) -> ListNode? {
	var prev: ListNode? = nil
	var current = head

	while current != nil {
	let next = current?.next
	current?.next = prev
	prev = current
	current = next
	}

	return prev
	}
	}
	```

		<!-- tabs:end -->

		<!-- solution:end -->
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27 changes: 27 additions & 0 deletions lcof2/剑指 Offer II 024. 反转链表/Solution.swift

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Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,27 @@
	/**
	* Definition for singly-linked list.
	* public class ListNode {
	* public var val: Int
	* public var next: ListNode?
	* public init(_ val: Int) {
	* self.val = val
	* self.next = nil
	* }
	* }
	*/

	class Solution {
	func reverseList(_ head: ListNode?) -> ListNode? {
	var prev: ListNode? = nil
	var current = head

	while current != nil {
	let next = current?.next
	current?.next = prev
	prev = current
	current = next
	}

	return prev
	}
	}

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