Balanced Parentheses Check using a Stack.

Updated Apr 28, 2026

Short answer

Push opening brackets; pop and match when closing brackets are encountered.

Deep explanation

Intermediate stack problems often involve monotonic properties or expression conversion. Push opening brackets; pop and match when closing brackets are encountered.

Real-world example

Compiler syntax checking for code blocks.

Common mistakes

  • Using a single variable for min-tracking instead of a stack (fails when min is popped).

Follow-up questions

  • Time complexity of sorting a stack?

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