Serial Problem Name Difficulty Level 1. Arrival of the General 1 2. Beautiful Matrix 1 3. Ultra-Fast Mathematician 1 4. Blackjack 1 5. HQ9+ 1 6. I_love_%username% 1 7. Petya and Strings 1 8. Cookies 1 9. Candy Bags 1 10. Drinks 1 11. Vasily the Bear and Triangle 1 12. Lunch Rush 1 13. Cakeminator 1 14. Stones on the Table 1 15. Bit++ 1 16. Levko and Table 1 17. Young Physicist 1 18. Chips 1 19. Tram 1 20. Queue at the School 1 21. Way Too Long Words 1 22. Present from Lena 2 23. Jeff and Digits 2 24. Slightly Decreasing Permutations 2 25. Sale 2 26. Fancy Fence 2 27. Dragons 2 28. The number of positions 2 29. Translation 2 30. Wizards and Demonstration 2 31. Xenia and Ringroad 2 32. Little Elephant and Rozdil 2 33. Life Without Zeros 2 34. Football 2 35. Dubstep 2 36. Magic Numbers 2 37. String Task 2 38. Lucky Division 2 39. Array 2 40. Sum of Digits 2 41. k-String 2 42. Puzzles 2 43. Next Test 3 44. Laptops 3 45. Pashmak and Garden 3 46. Lucky Sum 3 47. Kuriyama Mirai's Stones 3 48. Kitahara Haruki's Gift 3 49. The Fibonacci Segment 3 50. Difference Row 3 51. Little Pigs and Wolves 3 52. T-primes 3 53. Xenia and Divisors 3 54. Learning Languages 3 55. The Child and Toy 3 56. Sail 3 57. Find Marble 3 58. Free Cash 3 59. Roma and Changing Signs 3 60. Dreamoon and WiFi 3 61. Dima and Staircase 3 62. Comparing Strings 3 63. Sereja and Array 3 64. Sereja and Suffixes 3 65. Pashmak and Flowers 3 66. Simple Molecules 3 67. DZY Loves Chessboard 3 68. Fixed Points 3 69. Hungry Sequence 3 70. Building Permutation 3 71. Road Construction 3 72. Little Girl and Game 3 73. Fence 3 74. Flipping Game 3 75. Cut Ribbon 3 76. Ilya and Queries 3 77. Little Dima and Equation 4 78. George and Job 4 79. Sereja and Bottles 4 80. Routine Problem 4 81. Hamburgers 4 82. Jzzhu and Sequences 4 83. Flag Day 4 84. Valera and Fruits 4 85. Fox Dividing Cheese 4 86. Dima and Continuous Line 4 87. Lucky Numbers (easy) 4 88. Coach 4 89. Ciel and Flowers 4 90. k-Tree 4 91. Maximum Absurdity 4 92. Fixing Typos 4 93. Exams 4 94. Boredom 4 95. Prime Matrix 4 96. Books 4 97. Little Girl and Maximum Sum 4 98. Tetrahedron 4 99. XOR and OR 4 100. Painting Eggs 4