P05 — Sliding window and two pointers

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What is inside

• 1. Why this matters
• 2. How to recognise one
• 3. Fixed window versus dynamic window
• 4. The four questions to ask before writing
• 5. Why the brute force is worth writing
• 6. The two templates
• 7. Worked problems
• 8. Complexity
• 9. Traps checklist
• 10. Practice — 20 problems