算f(4): f(x) = -x for x<0; f(x) = f(x - f(x-1))/2 for x≥0.
Prompt
算f(4): f(x) = -x for x<0; f(x) = f(x - f(x-1))/2 for x≥0.
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算f(4): f(x) = -x for x<0; f(x) = f(x - f(x-1))/2 for x≥0.
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