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November 26, 2017 09:27
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| def solution(a) | |
| hash = {} | |
| a.each do |element| | |
| if hash[element].nil? | |
| hash[element] = 1 | |
| else | |
| hash[element] += 1 | |
| end | |
| end | |
| hash.select { |k, v| v % 2 == 1 }.keys.first | |
| end |
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