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15f578525d
advent
/
src
/
advent
/
util.cr
14 lines
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class
Array
(
T
)
def
union
reduce
(
T
.
new
)
do
|
l
,
r
|
l
|
r
end
end
def
intersect
reduce
do
|
l
,
r
|
l
&
r
end
end
end
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