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🎮 Stacks & Queues (Practice)

Companion to the Stacks & Queues guide. Watch a stack validate balanced brackets, then implement the check.

🎬 Watch it work​

Valid Parentheses — push opens, pop on matchStep 1 / 7
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'(' opens → push. Stack: (

🐍 Your turn​

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🧠 Challenge yourself​

  1. Return the index of the first unmatched bracket.
  2. Implement a queue using two stacks.
  3. Min-stack: support push/pop/getMin all in O(1).

Continue the path → Heaps & Priority Queues