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🎮 Arrays & Strings (Practice)

Companion to the Arrays & Strings guide. Practice in-place array manipulation — a core interview skill. Edit and run the code right here — it executes in your browser.

🐍 Your turn​

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🧠 Challenge yourself​

  1. Do it with slicing in one line — then explain why the reverse trick is O(1) space.
  2. Move all zeros to the end while keeping order of non-zeros.
  3. Find the longest common prefix of a list of strings.

Continue the learning path → Big O Complexity