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Answers and rating deltas for

I am solving a programming quiz and I am not able to understand the logic behind line 10 of this cod

Author Votes Δ
Lincoln C 1 +3.98
Support Ukraine 0 -0.19
Sylwit 0 -1.14
Abhishek 0 -0.98
Serve Laurijssen 0 -0.05
Last visited: Nov 30, 2016, 4:38:08 AM