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@kimhunter
Created October 13, 2011 15:08
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Merge sort ruby
#!/usr/bin/env ruby
# 2011-10-10 20:57:53 +1000
def merge_sort a
return a if a.size <= 1
l,r = split_array a
result = combine merge_sort(l), merge_sort(r)
end
def split_array a
mid = (a.size/2).round
return a.take(mid), a[mid, a.size-mid]
end
def combine a, b
return b.size.zero? ? a : b if a.first.nil? || b.first.nil?
smallest = a.first <= b.first ? a.shift : b.shift
return combine(a, b).unshift(smallest)
end
a = [6,23,53,1,2,5,62,61,33,21,14,6,23].shuffle
puts "#{merge_sort(a)}"
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