The following solution is returning all fails in the FCC IDE, but passing in external Online Python IDE (https://www.online-python.com/) with same test cases:
def find_missing_numbers(arr):
missing_numbers = []
largest_num = 0
for number in numbers:
if number > largest_num:
largest_num = number
print(largest_num)
for i in range(1, largest_num):
if i not in arr and i not in missing_numbers:
missing_numbers.append(i)
print(missing_numbers)
return missing_numbers.sort()
I’m using Firefox browser version 142.0.1 (aarch64)

