[Python] 5.1. CountDiv

https://app.codility.com/programmers/lessons/5-prefix_sums/

5. Prefix Sums lesson - Learn to Code - Codility

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Task Score: 100%

Correctness: 100%

Performance:100%

시간복잡도: O(1)

def solution(A, B, K):

    answer = 0

    if A == 0:
        answer += 1

    if A <= K:
        A = K
    else:
        if A % K == 0:
            pass
        else:
            A += K - ( A % K )
    
    answer += ((B-A)//K)+1

    return answer