HTMLify

// @leet start
/**
 * Definition for singly-linked list.
 * type ListNode struct {
 *     Val int
 *     Next *ListNode
 * }
 */
func reverseList(head *ListNode) *ListNode {
	if head == nil {
		return head
	}
	var p1, p2, p3 *ListNode
	p3 = head
	for ;p3.Next!=nil; {
		p1 = p2
		p2 = p3
		p3 = p3.Next
		p2.Next = p1
	}
	p3.Next = p2
	return p3
}
// @leet end