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R25_nestParen


APCS Recursion 2, Problem 5. Given a string, return true if it is a nesting of zero or more pairs of parenthesis, like "(())" or "((()))". Suggestion: check the first and last chars, and then recur on what's inside them.


R25_nestParen("(((x))") → false
R25_nestParen("((())") → false
R25_nestParen("((()()") → false

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public boolean R25_nestParen(String str) { }

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