Challenge 171 - Sum of Missing Numbers

challenge_171.md

Challenge 171 - Sum of Missing Numbers

Create a function that returns the sum of missing numbers from the given list.

Examples

sum_missing_numbers([4, 3, 8, 1, 2]) ➞ 18
# 5 + 6 + 7 = 18

sum_missing_numbers([17, 16, 15, 10, 11, 12]) ➞ 27
# 13 + 14 = 27

sum_missing_numbers([1, 2, 3, 4, 5]) ➞ 0
# No Missing Numbers (i.e. all numbers in [1, 5] are present in the list)

Notes

The numerical range to consider when searching for the missing numbers in the list is the sequence of consecutive numbers between the minimum and maximum of the numbers (inclusive).

challenge_tests.py

from __future__ import annotations
import unittest


def sum_missing_numbers(numbers: list[int]) -> int:
    return 0  # Put your code here!!!


class Test(unittest.TestCase):
    def test_1(self):
        self.assertEqual(sum_missing_numbers([1, 2, 3, 4, 5]), 0)

    def test_2(self):
        self.assertEqual(sum_missing_numbers([4, 3, 8, 1, 2]), 18)

    def test_3(self):
        self.assertEqual(sum_missing_numbers([17, 16, 15, 10, 11, 12]), 27)

    def test_4(self):
        self.assertEqual(sum_missing_numbers([-1, -4, -3, -2, -6, -8]), -12)


if __name__ == "__main__":
    unittest.main()

credits.md

Found on Edabit: Sum of Missing Numbers