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    Teacher Trinh Quang Cao Son

  1. Range converter
  2. Pyramid codes
  3. Rainbow
  4. pond
  5. Range converter 2
  6. Phone number prefix
  7. Nice number
  8. Largest number of matches
  9. Maximum value that splits two numbers
  10. Scheduled
  11. Chia Cake
  12. ATM withdrawal
  13. Plant tree
  14. The subsets have the largest sum
  15. Find the number on the zig zag matrix
  16. Maximum length of the range
  17. Three factors
  18. Perfect number(hard version)
  19. Game addiction
  20. Plentiful numbers(hard version)
  21. Year value
  22. Prime ( hard version )
  23. Sieve element
  24. General estimate (hard version)
  25. Primes less than n
  26. Candy sale
  27. (ACM / ICPC 2020) Count the Palindromes
  28. Pour water
  29. TicTacToe
  30. Number of symmetries in the range
  31. Reflective Paint