Created
February 3, 2016 15:48
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String intersection
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| def string_intersection(strings, key = 0, intersection = '') | |
| letter = strings.first[key] | |
| return if letter.nil? | |
| if strings.map {|str| str[key] == letter}.all? | |
| return string_intersection(strings, key + 1, intersection + letter) | |
| else | |
| return intersection | |
| end | |
| end |
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