How C++ merges K sorted linked lists

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Merge k sorted linked lists and return the merged sorted linked list. Please analyze and describe the complexity of the algorithm.

Example:

Input: [1-> 4-> 5, 1-> 3-> 4, 2-> 6] output: 1-> 1-> 2-> 3-> 4-> 4-> 5-> Definition for singly-linked list.# class ListNode (object): # def _ init__ (self, x): # self.val = x # self.next = Noneclass Solution (object): def mergeKLists (self Lists): ": type lists: List [ListNode]: rtype: ListNode" # synthesize a large listlist and sort lists = [x for x in lists if x] if not lists or all ([not x for x in lists]): return head = lists.pop () curr = head while curr.next: Curr = curr.next while lists: tmp = lists.pop () curr.next = tmp while tmp.next: tmp = tmp.next curr = tmp if not head or not head.next: return head return self.mergeSort (head) def mergeSort (self Head): if not head.next: return head pre, slow, fast = None, head, head while fast and fast.next: prev, slow, fast = slow, slow.next, fast.next.next prev.next = None left = self.mergeSort (head) right = self.mergeSort (slow) return self.merge (left, right) def merge (self, left Right): if not left: return right if not right: return left if left.val < right.val: res = left res.next = self.merge (left.next, right) else: res = right res.next = self.merge (left Right.next) return res above is the content of this article on "how C++ merges K sorted linked lists" I believe we all have a certain understanding. I hope the content shared by the editor will be helpful to you. If you want to know more about the relevant knowledge, please pay attention to the industry information channel.