A2OJ Ladders
This ladder provides a structured path for users with a Codeforces Rating between 1500 to 1599. It has different levels of difficulty, helping them to systematically improve their problem-solving skills. A2OJ ladders have proven to be beneficial for many competitive programmers over the years.
Also known as ACD Ladder 1500–1599, A2OJ Ladder.
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0/98
Overall progress
0 / 98
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Easy
0/59
Medium
0/13
Hard
| Status | Problem | Solve | Practice | Revision | Level | |
|---|---|---|---|---|---|---|
| 1. | Presents |  | Easy | |||
| 2. | Nearly Lucky Number | | Easy | |||
| 3. | Petya and Strings | | Easy | |||
| 4. | Tram | | Easy | |||
| 5. | Ultra-Fast Mathematician | | Easy | |||
| 6. | Amusing Joke | | Easy | |||
| 7. | Way Too Long Words | | Easy | |||
| 8. | Xenia and Ringroad | | Easy | |||
| 9. | Slightly Decreasing Permutations | | Easy | |||
| 10. | Football | | Easy | |||
| 11. | Caisa and Pylons | | Easy | |||
| 12. | Present from Lena | | Easy | |||
| 13. | k-String | | Easy | |||
| 14. | Fancy Fence | | Easy | |||
| 15. | Chat room | | Easy | |||
| 16. | Contest | | Easy | |||
| 17. | Twins | | Easy | |||
| 18. | Puzzles | | Easy | |||
| 19. | String Task | | Easy | |||
| 20. | Mashmokh and ACM | | Medium | |||
| 21. | The Child and Toy | | Medium | |||
| 22. | Fence | | Easy | |||
| 23. | T-primes | | Medium | |||
| 24. | Rank List | | Easy | |||
| 25. | Fox and Box Accumulation | | Medium | |||
| 26. | Cinema Line | | Easy | |||
| 27. | Escape from Stones | | Medium | |||
| 28. | Laptops | | Easy | |||
| 29. | Little Elephant and Bits | | Easy | |||
| 30. | Flipping Game | | Medium | |||
| 31. | Dima and Staircase | | Medium | |||
| 32. | Building Permutation | | Medium | |||
| 33. | Ilya and Queries | | Easy | |||
| 34. | Kuriyama Mirai's Stones | | Medium | |||
| 35. | Party | | Easy | |||
| 36. | Ice Skating | | Medium | |||
| 37. | Cut Ribbon | | Medium | |||
| 38. | Booking System | | Medium | |||
| 39. | Fox And Names | | Medium | |||
| 40. | Fox And Two Dots | | Medium | |||
| 41. | Pocket Book | | Medium | |||
| 42. | Array | | Medium | |||
| 43. | Ladder | | Medium | |||
| 44. | Divisibility by Eight | | Medium | |||
| 45. | Little Elephant and Problem | | Medium | |||
| 46. | Ciel and Flowers | | Medium | |||
| 47. | Convex Shape | | Medium | |||
| 48. | Maze | | Medium | |||
| 49. | View Angle | | Hard | |||
| 50. | Mr. Kitayuta, the Treasure Hunter | | Hard | |||
| 51. | Maximum Absurdity | | Medium | |||
| 52. | Color Stripe | | Medium | |||
| 53. | Checkposts | | Medium | |||
| 54. | Misha and Forest | | Medium | |||
| 55. | Kolya and Tandem Repeat | | Medium | |||
| 56. | Anya and Ghosts | | Medium | |||
| 57. | Removing Columns | | Medium | |||
| 58. | Beautiful Numbers | | Hard | |||
| 59. | Vasya and Chess | | Medium | |||
| 60. | Hamburgers | | Medium | |||
| 61. | Colorful Graph | | Medium | |||
| 62. | To Add or Not to Add | | Medium | |||
| 63. | Xenia and Bit Operations | | Medium | |||
| 64. | Little Girl and Maximum XOR | | Medium | |||
| 65. | Arithmetic Progression | | Medium | |||
| 66. | Friends and Presents | | Hard | |||
| 67. | Barcode | | Medium | |||
| 68. | Xenia and Weights | | Medium | |||
| 69. | Little Dima and Equation | | Medium | |||
| 70. | Long Jumps | | Medium | |||
| 71. | Tetrahedron | | Medium | |||
| 72. | Physics Practical | | Medium | |||
| 73. | Boredom | | Medium | |||
| 74. | Valera and Tubes | | Medium | |||
| 75. | Valera and Elections | | Medium | |||
| 76. | Little Girl and Maximum Sum | | Medium | |||
| 77. | George and Job | | Medium | |||
| 78. | Table Decorations | | Hard | |||
| 79. | k-Tree | | Medium | |||
| 80. | Color the Fence | | Medium | |||
| 81. | Polo the Penguin and Matrix | | Medium | |||
| 82. | Another Problem on Strings | | Medium | |||
| 83. | Exams | | Medium | |||
| 84. | Caesar's Legions | | Medium | |||
| 85. | Beautiful Sets of Points | | Medium | |||
| 86. | Number of Ways | | Medium | |||
| 87. | A and B and Interesting Substrings | | Hard | |||
| 88. | Valid Sets | | Hard | |||
| 89. | Devu and Partitioning of the Array | | Medium | |||
| 90. | Good Substrings | | Hard | |||
| 91. | Wonder Room | | Hard | |||
| 92. | Present | | Medium | |||
| 93. | Painting Fence | | Hard | |||
| 94. | Vasya and Basketball | | Medium | |||
| 95. | Bear and Prime Numbers | | Medium | |||
| 96. | Restore Graph | | Hard | |||
| 97. | Gargari and Bishops | | Hard | |||
| 98. | Multiplication Table | | Hard |
There is no PDF here, and you do not need one. All 98 problems are listed in full on this page, free and without an account — and unlike a PDF the list remembers what you have ticked off, so you are not re-reading a static file to work out where you stopped. Use your browser's print view if you want it on paper.
Yes — same sheet, different name. It is also known as ACD Ladder 1500–1599, A2OJ Ladder. Whichever name you searched for, this is the tracker for it.
Tick a problem on this page and it stays ticked. Progress saves in your browser straight away with no account, and the counts update per section so you can see which parts of 1500-1599 A2OJ: Ladder you have actually covered. Signing in with Google syncs it across devices.
At roughly 25 minutes a problem — reading it, solving it and writing the approach down — 98 problems is about 41 hours, or 4 weeks at ten hours a week. Treat that as a planning figure rather than a promise; the first pass through an unfamiliar topic is always slower.
Yes, completely, and no account is needed. There is no paid tier and nothing is held back — the sheet itself is by A2OJ Ladders, and this is a free tracker for it.
Finish one. Sheets overlap heavily, so working several in parallel mostly means re-solving the same problems while never completing a full topic sweep. If you are not sure this is the right one for the time you have, the sheet comparison page puts the options side by side with hour estimates.