[Lesson 5][Prefix Sums] CountDiv

app.codility.com/programmers/lessons/5-prefix_sums/count_div/

CountDiv coding task - Learn to Code - Codility

# A~B 사이에 K 배수가 몇개인지

def solution(A, B, K):
    end_cnt = B // K
    start_cnt = (A - 1) // K
    return end_cnt - start_cnt


print(solution(7, 11, 2))  # 2