Stack / Queue is a repeated product-company interview pattern because it tests whether you can turn a brute-force idea into a predictable invariant.
Open on LeetCodeGiven a bracket string, decide whether every opening bracket is closed in the correct order.
s = '()[]{}' -> true
s = '(]' -> false
Try framing your own approach first. The 30 seconds you think before peeking is where learning happens.
Reveal the approach first.
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