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Practice

Prefix Sum Problem Set

⭐⭐ intermediate~45 min of coding5 challenges

Five contest problems drilled on 1D/2D prefixes, counting, and windows — byte-exact grading.

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What you will practice

  1. Range Sums⭐ beginner
  2. Even Count in Range⭐ beginner
  3. Rectangle Sums⭐⭐ intermediate
  4. Zero-Sum Subarrays⭐⭐ intermediate
  5. Maximum Window⭐⭐ intermediate

Need the concept first? Re-read the lesson.