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Practice

Performance Practice: Build, Pick, Materialize

⭐⭐ intermediate~30 min of coding4 challenges

Rebuild an O(n²) report builder, replace a linear membership test with a set, fix a pipeline that runs its filter twice, and debug a lookup that re-queries per call.

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What you will practice

  1. StringBuilder, Not Concatenation⭐⭐ intermediate
  2. HashSet Against the Quadratic⭐⭐ intermediate
  3. Enumerate Once⭐⭐ intermediate
  4. Debug: The Query in the Loop⭐⭐ intermediate

Need the concept first? Re-read the lesson.