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added 62 characters in body

edited Jan 6, 2020 at 9:43

edited Jan 6, 2020 at 9:43

Python 3, 47 bytes

f=lambda l,i=3:i+1and abs(l[i]-l[i-1])-f(l,i-1)

Take complex number input. Outputs as Truthy/Falsey swapped. Test cases from Noodle9.

48 bytes

lambda a,b,c,d:A(a-b)+A(c-d)-A(b-c)-A(d-a)
A=abs

answered Jan 6, 2020 at 6:32