106. Merge Two Sorted Lists

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Input: list1 = [1, 2, 4], list2 = [1, 3, 4]

Output: [1, 1, 2, 3, 4, 4]

Explanation: The two lists are merged in sorted order.

Input: list1 = [], list2 = []

Output: []

Explanation: Both lists are empty, so the merged list is also empty.

Input: list1 = [], list2 = [0]

Output: [0]

Explanation: Only list2 has a node, so the merged list contains only that node.

Time Complexity

O(n + m)

Space Complexity

O(1)