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@sagivo
Last active August 29, 2015 14:09
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permutation in ruby
def perm arr, i=0
return p arr if i == arr.size
(i..arr.size-1).each do |j|
arr[i], arr[j] = arr[j], arr[i]
perm arr, i+1
arr[i], arr[j] = arr[j], arr[i]
end
end
perm 'ABC'
-------------
"ABC"
"ACB"
"BAC"
"BCA"
"CBA"
"CAB"
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