17/07/30 19:16:10.29 LizATlBz.net
>>431 Ruby
def farey(n, k)
return [0r, 1r][k] if n == 1
farey(n - 1, 0..-1).each_cons(2).inject([0r]){|s, (a, b)|
x = a.denominator + b.denominator
s << 1r*(a.numerator + b.numerator)/x if x == n
s << b
}[k]
end
17/07/30 19:16:10.29 LizATlBz.net
>>431 Ruby
def farey(n, k)
return [0r, 1r][k] if n == 1
farey(n - 1, 0..-1).each_cons(2).inject([0r]){|s, (a, b)|
x = a.denominator + b.denominator
s << 1r*(a.numerator + b.numerator)/x if x == n
s << b
}[k]
end