1. POJ 2225 - Asteroids!
  2. POJ 2456 - Aggressive cows
  3. POJ 2011 - Primary X-Subfactor Series
  4. POJ 1328 - Radar Installation
  5. POJ 1319 - Pipe Fitters
  6. POJ 2606 - Rabbit hunt
  7. POJ 2443 - Set Operation
  8. POJ 3399 - Product
  9. POJ 3475 - Paper-, er, Transcript-Folding Game
  10. POJ 3618 - Exploration
  11. POJ 2160 - Box
  12. POJ 1330 - Nearest Common Ancestors
  13. POJ 1111 - Image Perimeters
  14. AOJ 1074 - Popularity Estimation
  15. POJ 3292 - Semi-prime H-numbers
  16. POJ 3185 - The Water Bowls
  17. POJ 1675 - Happy Birthday!
  18. POJ 2948 - Martian Mining
  19. AOJ 2296 - Quest of Marchant
  20. POJ 3347 - Kadj Squares