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Practice

Grid lab: axes, neighborhoods, walls

⭐⭐⭐ advanced~60 min of coding5 challenges

Five traversal problems where every hidden test lives on a boundary.

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What you will practice

  1. Sum the neighbors⭐⭐ intermediate
  2. Per-column balances⭐⭐⭐ advanced
  3. Rotate 90 degrees clockwise⭐⭐⭐ advanced
  4. Count the peaks⭐⭐⭐ advanced
  5. Spiral fill⭐⭐⭐ advanced

Need the concept first? Re-read the lesson.