At each position, you can add '(' or ')'. But not all choices are valid. Constraints: - You can add '(' if you haven't used all n opening parens - You can add ')' only if there are more '(' than ')' so far Track open count and close count. Prune invalid branches immediately.
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$ curl repovive.com/roadmaps/maang-interview-prep/backtracking/generate-parentheses-hint
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