#!ruby -n a=[0] gsub(/./){a=[*[a.flat_map{|n|[n-1,n+1]},a[1..-1],a[0..-2],eval(a*?+)||0,eval(a*?*)||1]["v<>^/".index$&]]} p a
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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