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#define CMP_NUM(a,b) (((a) < (b)) ? -1 : ((a) == (b)) ? 0 : 1)
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#define sgn(a) (((a) < 0) ? -1 : ((a) > 0) ? 1 : 0)
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#define test(a) ((a) ? 1 : 0)
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#define set_if_bigger(a,b) do { if ((a) < (b)) (a)=(b); } while(0)
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#define set_if_smaller(a,b) do { if ((a) > (b)) (a)=(b); } while(0)