Input:

[0]

0

[1]

1

Output:

[0,1]

Expected:

[1]

According to the question, nums1 is a sorted list with m initialized elements. But in this test case nums1=[0] but m = 0

Now look at another test case:

Your input

[1,2,3,4]

2

[2]

1

Your answer

[1,2,2,4]

Expected answer

[1,2,2,4]

Here, although len(nums) =4 and m =2, so the test case will take the first 2 elements in nums1 into account.