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# Definition for singly-linked list.

class ListNode:

def __init__(self, x):

self.val = x

self.next = None

class Solution:

def insertionSortList(self, head: ListNode) -> ListNode:

# 초기값 변경

cur = parent = ListNode(0)

while head:

while cur.next and cur.next.val < head.val:

cur = cur.next

cur.next, head.next, head = head, cur.next, head.next

# 필요한 경우에만 cur 포인터가 되돌아가도록 처리

if head and cur.val > head.val:

cur = parent

return parent.next