a098:
分組平均值
Content
給定兩個整數n和k，將所有從1到n的整數分為兩類，第一類包含可以被k整除的整數（換句話說，這些整數是k的倍數）；
另一類包含其他整數。
您的任務是計算出每個類的平均值並以一行的方式輸出，數值之間以「 , 」作分隔，各數值精確至小數點後一位。
Input
Two integers n and k
2 <= k <= 100
2 <= n <= 1000000
Output
a float number with precision one decimal place
Sample Input
#1
100 16
Sample Output
#1
56.0 , 50.1
Sample Input
#2
10000 32
Sample Output
#2
5008.0 , 5000.3
Sample Input
#3
20 5
Sample Output
#3
12.5 , 10.0
測資資訊：
記憶體限制：
64
MB
不公開 測資點#0 (33%): 1.0s , <1K
不公開 測資點#1 (33%): 1.0s , <1K
不公開 測資點#2 (34%): 1.0s , <1K
不公開 測資點#0 (33%): 1.0s , <1K
不公開 測資點#1 (33%): 1.0s , <1K
不公開 測資點#2 (34%): 1.0s , <1K
Hint ：
[Straight forward solution] You can simply use "loop and range()"to solve the problem.
[Advanced solution] However, naively using loop to classify and get the sum of the numbers may be too costly as the value of n can be up to 1,000,000. You could try to derive the math relationship behind the problem.
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