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TheAlgorithms
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Ruby
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master
Breadcrumbs
Ruby
/
sorting
/
merge_sort.rb
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36 lines (31 loc) · 827 Bytes
master
Breadcrumbs
Ruby
/
sorting
/
merge_sort.rb
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36 lines (31 loc) · 827 Bytes
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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?
&&
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
result
<<
if
first_array
.
first
<
second_array
.
first
first_array
.
shift
else
second_array
.
shift
end
end
end
result
end
if
$0 ==
__FILE__
puts
'Enter a list of numbers separated by space'
list
=
gets
.
split
.
map
(
&
:to_i
)
p
merge_sort
(
list
)
end
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