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Solution to the APL problem posed @ https://www.meetup.com/FunctionalKubs/events/241891161/
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| ⍝ Solution that takes a string which may contain parentheses: | |
| ⍝ * Get the maximum depth | |
| ⍝ * Check that it is balanced | |
| depths←{+\(1 ¯1 0)['()'⍳⍵]} | |
| balanced←{⌊/depths ⍵} | |
| max_depth←{⌈/depths ⍵} | |
| s1←'abc(def(ghi)(jkl(mno)pqr))' | |
| s2←')(xxx(yyy)' | |
| balanced s1 | |
| max_depth s1 | |
| balanced s2 | |
| max_depth s2 |
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