TheAlgorithms-Ruby/sorting/merge_sort.rb

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Ruby
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2020-02-09 15:53:12 +01:00
def merge_sort(array)
return array if array.length <= 1
mid = array.length / 2
first_array = array.slice(0..mid - 1)
second_array = array.slice(mid..-1)
first_array = merge_sort first_array
second_array = merge_sort second_array
# merge
result = []
until first_array.empty? and second_array.empty?
if first_array.empty?
result.concat(second_array)
second_array.clear
elsif second_array.empty?
result.concat(first_array)
first_array.clear
else
if first_array.first < second_array.first
result << first_array.shift
else
result << second_array.shift
end
end
end
result
end
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puts "Enter a list of numbers separated by space"
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list = gets
print merge_sort list.split(" ").map(&:to_i)