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- def duplicate_count(text)
- freq = {}
- letters = text.chars
- letters.each do |l|
- if freq.has_key? l
- freq[l] = freq[l] + 1
- else
- freq[l] = 1
- end
- end
- s = 0
- freq.each_value do |v|
- if v > 1
- s = s + 1
- end
- end
- s
- end
- puts duplicate_count 'aabc'
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