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| def frequency(arr) | |
| count_elments = arr.inject(Hash.new(0)) { |total, e| total[e] += 1 ; total }.sort.sort_by { |k,v| -v } | |
| count_elments.map { |el| el[0] } | |
| end | |
| def flatten(arr) | |
| flatten_array ||= [] | |
| arr.each do |el| | |
| if el.is_a? Array | |
| flatten_array.concat(flatten(el)) | |
| else | |
| flatten_array << el | |
| end | |
| end | |
| flatten_array | |
| end | |
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