18 lines
449 B
Ruby
18 lines
449 B
Ruby
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#Given an array of length n contains elements from 0 to n-1,
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#Print all the duplicate elements in O(n) time and constant space.
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def print_duplicates(a)
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n=a.length
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print "Duplicate elements are: "
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for i in 0...n
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if a[a[i].abs]<0
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print "#{a[i].abs} "
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else
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a[a[i].abs]= -a[a[i].abs]
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end
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end
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return
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end
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print_duplicates([1, 4, 6, 4, 3, 6, 1]) # => Duplicate elements are: 4 6 1
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