Sort List

문제

Given the head of a linked list, return the list after sorting it in ascending order.
Follow up: Can you sort the linked list in O(n logn) time and O(1) memory (i.e. constant space)?

조건

예제

Input: head = [-1,5,3,4,0]
Output: [-1,0,3,4,5]

Input: head = [-1,5,3,4,0]
Output: [-1,0,3,4,5]

Input: head = []
Output: []

해결

1st

1 생각