What is Sliding Window Technique?

Updated Apr 28, 2026

Short answer

Sliding window optimizes subarray problems using a moving window.

Deep explanation

Instead of recalculating values repeatedly, sliding window reuses previous computations by expanding and shrinking the window.

Real-world example

Finding max sum subarray of size k.

Common mistakes

  • Not adjusting window correctly.

Follow-up questions

  • Fixed vs variable window?
  • Why sliding?

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