【深基4.例3】分类平均 - 洛谷
"""
P5719 【深基4.例3】分类平均
https://www.luogu.com.cn/problem/P5719
"""
n,k=map( int,input().split() )
c=n//k
a=c*(c+1)/2*k
b=n*(n+1)/2-a
print( "%.1f" %(a/c),end=" " )
print( "%.1f" %(b/(n-c)) )
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【深基4.例3】分类平均 - 洛谷
"""
P5719 【深基4.例3】分类平均
https://www.luogu.com.cn/problem/P5719
"""
n,k=map( int,input().split() )
c=n//k
a=c*(c+1)/2*k
b=n*(n+1)/2-a
print( "%.1f" %(a/c),end=" " )
print( "%.1f" %(b/(n-c)) )
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