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@(x,y)find((v=((z=cumsum(x.^2))(y:end)-[0,z(1:end-y)]))==max(v),1)-1

Success #stdin #stdout 0.21s 103360KB

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ans =

@(x, y) find ((v = ((z = cumsum (x .^ 2)) (y:end) - [0, z(1:end - y)])) == max (v), 1) - 1

https://ideone.com/H50TrF

language:

Octave (octave 4.4.1)

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public

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