13 lines
315 B
Ruby
13 lines
315 B
Ruby
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# Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array.
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#
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# @param {Integer[]} numbers
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# @return {Integer}
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def missing_number(numbers)
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last = -1
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numbers.each do |number|
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return number - 1 unless number - 1 == last
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last = number
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end
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end
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