LeetCode python-147. 对链表进行插入排序

LeetCode python-147. 对链表进行插入排序

先看题目：
（题目来力扣网站）

# Definition for singly-linked list.
class ListNode:
    def __init__(self, x):
        self.val = x
        self.next = None

class Solution:
    def insertionSortList(self, head):
        if not head:
            return None
        pre = head
        cur = head.next
        while cur:
            if cur.val < pre.val:
                pre.next = cur.next
                temp = ListNode(0)
                temp.next = head
                if cur.val < head.val:
                    head = cur
                while temp != pre:
                    if temp.next.val > cur.val:
                        cur.next = temp.next
                        temp.next = cur
                        break
                    else:
                        temp = temp.next
                cur = pre.next
            else:
                pre = cur
                cur = cur.next
        return head


node1 = ListNode(4)
node2 = ListNode(2)
node3 = ListNode(1)
node4 = ListNode(3)
node1.next = node2
node2.next = node3
node3.next = node4

s = Solution()
node5 = s.insertionSortList(node1)
while(node5):
    print(node5.val)
    node5 = node5.next