Serial Problem Name Difficulty Level 1. Choosing Teams 1 2. Nearly Lucky Number 1 3. Amusing Joke 1 4. Drinks 1 5. Way Too Long Words 1 6. Presents 1 7. Lunch Rush 1 8. Soft Drinking 1 9. Boy or Girl 1 10. Dividing Orange 1 11. Queue at the School 1 12. HQ9+ 1 13. I_love_%username% 1 14. Cakeminator 1 15. Word 1 16. Stones on the Table 1 17. Beautiful Year 1 18. Team 4 19. Insomnia cure 1 20. Vanya and Cards 1 21. Tram 1 22. Petya and Strings 1 23. Array 4 24. Little Elephant and Chess 2 25. Dubstep 2 26. Permutation 2 27. Magic Numbers 2 28. Heads or Tails 2 29. Present from Lena 2 30. Marks 2 31. Xenia and Ringroad 2 32. Lucky Division 2 33. Twins 2 34. Translation 2 35. Chat room 2 36. Football 2 37. Ilya and Bank Account 2 38. Parallelepiped 2 39. String Task 2 40. k-String 2 41. Dragons 2 42. Puzzles 2 43. Playing Cubes 3 44. Two Bags of Potatoes 3 45. Big Segment 3 46. Pashmak and Flowers 3 47. Building Permutation 3 48. Boys and Girls 3 49. Cinema Line 3 50. Rank List 3 51. Points on Line 3 52. Little Girl and Game 3 53. Little Pony and Expected Maximum 3 54. Cosmic Tables 3 55. Lucky Sum of Digits 3 56. Ice Skating 3 57. Sereja and Suffixes 3 58. Free Cash 3 59. Mashmokh and ACM 3 60. Domino 3 61. Hungry Sequence 3 62. Ilya and Queries 3 63. Fence 3 64. T-primes 3 65. Flipping Game 3 66. Cut Ribbon 3 67. Counting Kangaroos is Fun 4 68. Median 4 69. Ciel and Flowers 4 70. Vanya and Exams 4 71. Fixing Typos 4 72. LCM Challenge 4 73. Caesar's Legions 4 74. Xenia and Bit Operations 4 75. Little Girl and Maximum Sum 4 76. Palindrome Transformation 4 77. Factory 4 78. Ping-Pong (Easy Version) 4 79. Routine Problem 4 80. Tourist Problem 4 81. Color Stripe 4 82. Maze 4 83. Polo the Penguin and Matrix 4 84. Boredom 4 85. Funky Numbers 4 86. George and Job 4 87. Xenia and Weights 4 88. Physics Practical 4 89. Little Pony and Sort by Shift 4 90. Bombs 4 91. Number of Ways 4 92. Another Problem on Strings 4 93. Color the Fence 4 94. Tetrahedron 4 95. k-Tree 4 96. Vasya and Basketball 5 97. Gargari and Bishops 5