How to Fast way to find duplicate in large arrayAsk Questions

 Posted on 16/08/2018 11:34:48 AM

I have an array with 35k elements. How may I efficiently find duplicates and return those duplicates?

all = [*1..35000, 1]

This solution works:

all.select { |v| all.count(v) > 1 }

But it takes a long time.

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Asked by Hardik Bera on 16/08/2018 11:34:48 AM Score: 375 points
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