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Answers and rating deltas for

Can someone explains why this code prints 4?

Author Votes Δ
Vadim Yangunaev 3 +4.68
NathanOliver 2 -0.00
Bodo Thiesen 1 +0.44
Rahul kumar 0 -2.38
Wolmaner 0 -2.38
Last visited: May 11, 2019, 11:16:05 PM