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f x=sum.($x).x=[sum$y($divdiv(length x)2)<$>[takex|y<-[take,drop]drop]]
Try it online!Try it online!
Based on Steven Fontanella's answer with some non-trivial modification.
f x=sum.($x).($div(length x)2)<$>[take,drop]
Try it online!
f x=[sum$y(div(length x)2)x|y<-[take,drop]]
