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Answers and rating deltas for

How to replace each 0 with the preceding element in a list in an idiomatic way in Mathematica?

Author Votes Δ
Leonid Shifrin 12 +0.73
Sjoerd C. de Vries 8 -0.08
Heike 8 +0.56
Andrei 6 -2.22
Last visited: Sep 14, 2014, 5:07:29 AM