Code Fights - arrayMaximalAdjacentDifference

README.md

Given an array of integers, find the maximal absolute difference between any two of its adjacent elements.

Example

For inputArray = [2, 4, 1, 0], the output should be
arrayMaximalAdjacentDifference(inputArray) = 3.

Input/Output

• [time limit] 4000ms (py3)

• [input] array.integer inputArray

  Guaranteed constraints:

  3 ≤ inputArray.length ≤ 10,
  -15 ≤ inputArray[i] ≤ 15.
  

• [output] integer

  The maximal absolute difference.

array_maximal_adjacent_difference.py

from typing import List


class ArrayMaximalAdjacentDifference:
    @classmethod
    def array_maximal_adjacent_difference(cls, data: List[int]):
        max_abs_dif = 0
        prev = data[0]
        for d in data:
            abs_dif = abs(d - prev)
            if abs_dif > max_abs_dif:
                max_abs_dif = abs_dif
            prev = d
        return max_abs_dif

arrayMaximalAdjacentDifference.py

def arrayMaximalAdjacentDifference(data: list):
    max_abs_dif = 0
    prev = data[0]
    for d in data:
        abs_dif = abs(d - prev)
        if abs_dif > max_abs_dif:
            max_abs_dif = abs_dif
        prev = d
    return max_abs_dif

test_array_maximal_adjacent_difference.py

import unittest
from array_maximal_adjacent_difference import ArrayMaximalAdjacentDifference


class TestArrayMaximalAdjacentDifference(unittest.TestCase):
    def test_1(self):
        data = [2, 4, 1, 0]
        solution = 3
        result = ArrayMaximalAdjacentDifference.array_maximal_adjacent_difference(data)
        self.assertEqual(result, solution)

    def test_2(self):
        data = [1, 1, 1, 1]
        solution = 0
        result = ArrayMaximalAdjacentDifference.array_maximal_adjacent_difference(data)
        self.assertEqual(result, solution)

    def test_3(self):
        data = [-1, 4, 10, 3, -2]
        solution = 7
        result = ArrayMaximalAdjacentDifference.array_maximal_adjacent_difference(data)
        self.assertEqual(result, solution)


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