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Recursion-1 > nestParen
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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.

nestParen("(())") → true
nestParen("((()))") → true
nestParen("(((x))") → false

...Save, Compile, Run (ctrl-enter)

public boolean nestParen(String str) { }

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