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IsTestSolvable.md

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Is Test Solvable

You've been preparing all night for the upcoming test and entered the class certain that you will ace it. Now that you received the test questions, you died inside a little: looks like you prepared for the test on a completely different topic.

You're not even sure if you should bother to answer the questions. You still have some hope though: it is known that there's a glitch in the test preparing system, so that if the sum of digits of question ids is divisible by k, the answer to each question has a 90% probability to be an A.

Given the list of question ids, determine if the sum of their digits is divisible by k to see if it's worth trying to pass the test.

Example

For ids = [529665, 909767, 644200] and k = 3, the output should be
solution(ids, k) = true.

The sum of digits is

(5 + 2 + 9 + 6 + 6 + 5) + (9 + 0 + 9 + 7 + 6 + 7) + (6 + 4 + 4 + 2 + 0 + 0) = 87

which is divisible by 3. Today is your lucky day after all!

Input/Output

  • [execution time limit] 4 seconds (py3)

  • [input] array.integer ids

    Array of unique question ids.

    Guaranteed constraints:
    1 ≤ ids.length ≤ 50,
    0 ≤ ids[i] ≤ 10^6^.

  • [input] integer k

    The number that causes a glitch in the test preparing system.

    Guaranteed constraints:
    2 ≤ k ≤ 10.

  • [output] boolean

    true if the total sum of digits in ids is divisible by k, false otherwise.


Solution

def solution(ids, k):
    digitSum = lambda q: sum( int(x) for x in str(q))

    sm = 0
    for questionId in ids:
        sm += digitSum(questionId)
    return sm % k == 0

See on app.codesignal.com