Submission #1123259

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Source Code Expand

#!/usr/bin/ruby
n=gets.to_i
s=gets.chomp
[83,87].repeated_permutation(2).find{|_|
	a=_.dup
	2.upto(n+1){|i|
		a[i]=a[i-2]^((a[i-1]==87)^(s[~-i%n]==?x) ? 4 : 0)
	}
	$><<a[0..-3].map(&:chr)*''if a[0]==a[n]&&a[1]==a[n+1]
}||(p -1)

Submission Info

Compile Error

./Main.rb:10: warning: ambiguous first argument; put parentheses or a space even after `-' operator

Judge Result