class Solution: def mergeTwoLists(self, list1: Optional[ListNode], list2: Optional[ListNode]) -> Optional[ListNode]: cur = dummy = ListNode() while list1 and list2: if list1.val < list2.val: cur.next = list1 list1, cur = list1.next, list1 else: cur.next = list2 list2, cur = list2.next, list2 if list1 or list2: cur.next = list1 if list1 else list2 return dummy.next
Question
class Solution: def mergeTwoLists(self, list1: Optional[ListNode], list2: Optional[ListNode]) -> Optional[ListNode]: cur = dummy = ListNode() while list1 and list2: if list1.val < list2.val: cur.next = list1 list1, cur = list1.next, list1 else: cur.next = list2 list2, cur = list2.next, list2 if list1 or list2: cur.next = list1 if list1 else list2 return dummy.next
Solution
This is a Python code snippet for a class named "Solution". The class has a method named "mergeTwoLists" which takes two linked lists as input and merges them into a single sorted linked list. Here's a step-by-step explanation:
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The method "mergeTwoLists" is defined with two parameters, "list1" and "list2". These are expected to be linked lists.
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A new linked list is created with a dummy node. "cur" and "dummy" are pointers to this new linked list.
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A while loop is initiated which continues until both "list1" and "list2" are not empty.
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Inside the loop, it checks if the value of the first node of "list1" is less than the value of the first node of "list2". If it is, the next node of "cur" is set to the first node of "list1", and then "list1" and "cur" are moved to the next node. If it's not, the same operations are performed but with "list2".
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After the loop, if there are still nodes left in either "list1" or "list2", the remaining nodes are appended to the end of the new linked list.
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Finally, the method returns the next node of "dummy", which is the head of the new merged linked list. The dummy node is used to simplify the code and avoid handling edge cases separately.
This method effectively merges two sorted linked lists into a single sorted linked list.
Similar Questions
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he correct answerWhat will be the output of the following Python code?>>>list1 = [1, 3]>>>list2 = list1>>>list1[0] = 4>>>print(list2)Options[1, 4][4, 3][1, 3, 4][1, 3]
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