A2OJ Ladders
This ladder provides a structured path for users with a Codeforces Rating between 2200 to 4000. 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 2200–4000, A2OJ Ladder.
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Overall progress
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Easy
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Medium
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Hard
| Status | Problem | Solve | Practice | Revision | Level | |
|---|---|---|---|---|---|---|
| 1. | Pangram |  | Easy | |||
| 2. | Fox And Snake | | Easy | |||
| 3. | Insomnia cure | | Easy | |||
| 4. | Watching a movie | | Easy | |||
| 5. | Dreamoon and WiFi | | Medium | |||
| 6. | Playing with Paper | | Easy | |||
| 7. | Link/Cut Tree | | Medium | |||
| 8. | Crazy Town | | Medium | |||
| 9. | Mr. Kitayuta, the Treasure Hunter | | Hard | |||
| 10. | Tennis Game | | Hard | |||
| 11. | Number of Ways | | Medium | |||
| 12. | Error Correct System | | Medium | |||
| 13. | Fight the Monster | | Hard | |||
| 14. | Skills | | Hard | |||
| 15. | Clique Problem | | Hard | |||
| 16. | Glass Carving | | Medium | |||
| 17. | Edo and Magnets | | Hard | |||
| 18. | Appleman and a Sheet of Paper | | Hard | |||
| 19. | Numbers | | Hard | |||
| 20. | Greg and Friends | | Hard | |||
| 21. | Watto and Mechanism | | Hard | |||
| 22. | Jeff and Permutation | | Hard | |||
| 23. | Sereja and Brackets | | Hard | |||
| 24. | Freelancer's Dreams | | Hard | |||
| 25. | Hexagons | | Hard | |||
| 26. | Valid Sets | | Hard | |||
| 27. | Multipliers | | Hard | |||
| 28. | Top Secret Task | | Hard | |||
| 29. | Characteristics of Rectangles | | Hard | |||
| 30. | Tavas and Malekas | | Hard | |||
| 31. | Destroying Roads | | Hard | |||
| 32. | Mr. Kitayuta's Technology | | Hard | |||
| 33. | Maximum Value | | Hard | |||
| 34. | Three States | | Hard | |||
| 35. | Antimatter | | Hard | |||
| 36. | Dreamoon and Strings | | Hard | |||
| 37. | Necklace | | Hard | |||
| 38. | Number Transformation II | | Hard | |||
| 39. | Tricky Function | | Hard | |||
| 40. | REQ | | Hard | |||
| 41. | Soldier and Traveling | | Hard | |||
| 42. | Board Game | | Hard | |||
| 43. | Jzzhu and Numbers | | Hard | |||
| 44. | Name That Tune | | Hard | |||
| 45. | Zip-line | | Hard | |||
| 46. | Nudist Beach | | Hard | |||
| 47. | Mr. Kitayuta's Colorful Graph | | Hard | |||
| 48. | Fox And Dinner | | Hard | |||
| 49. | Traffic Jams in the Land | | Hard | |||
| 50. | Mike and Frog | | Hard | |||
| 51. | Prefix Product Sequence | | Hard | |||
| 52. | Road Improvement | | Hard | |||
| 53. | Ann and Half-Palindrome | | Hard | |||
| 54. | Tanya and Password | | Hard | |||
| 55. | Tree and Queries | | Hard | |||
| 56. | Cats Transport | | Hard | |||
| 57. | Greg and Caves | | Hard | |||
| 58. | Jzzhu and Apples | | Hard | |||
| 59. | Developing Game | | Hard | |||
| 60. | Fuzzy Search | | Hard | |||
| 61. | Case of a Top Secret | | Hard | |||
| 62. | CNF 2 | | Hard | |||
| 63. | GukiZ and GukiZiana | | Hard | |||
| 64. | Arthur and Walls | | Hard | |||
| 65. | Kingdom and its Cities | | Hard | |||
| 66. | Tavas and Pashmaks | | Hard | |||
| 67. | Data Center Drama | | Hard | |||
| 68. | Hack it! | | Hard | |||
| 69. | Remembering Strings | | Hard | |||
| 70. | Kindergarten | | Hard | |||
| 71. | DZY Loves Planting | | Hard | |||
| 72. | Tavas in Kansas | | Hard | |||
| 73. | Intergalaxy Trips | | Hard | |||
| 74. | Largest Submatrix 3 | | Hard | |||
| 75. | Serega and Fun | | Hard | |||
| 76. | Sign on Fence | | Hard | |||
| 77. | Ciel and Gondolas | | Hard | |||
| 78. | Sign Posts | | Hard | |||
| 79. | Positions in Permutations | | Hard | |||
| 80. | Mike and Friends | | Hard | |||
| 81. | Appleman and Complicated Task | | Hard | |||
| 82. | Stairs and Lines | | Hard | |||
| 83. | Helping People | | Hard | |||
| 84. | Birthday | | Hard | |||
| 85. | Dreamoon and Binary | | Hard | |||
| 86. | Conveyor Belts | | Hard | |||
| 87. | Mr. Kitayuta vs. Bamboos | | Hard | |||
| 88. | A Museum Robbery | | Hard | |||
| 89. | Fox And Travelling | | Hard | |||
| 90. | Little Elephant and Broken Sorting | | Hard | |||
| 91. | Mike and Fish | | Hard | |||
| 92. | Strange Sorting | | Hard | |||
| 93. | Case of Computer Network | | Hard | |||
| 94. | Shop | | Hard | |||
| 95. | Gerald and Path | | Hard | |||
| 96. | Tavas on the Path | | Hard | |||
| 97. | Polo the Penguin and Lucky Numbers | | Hard | |||
| 98. | Ghd | | Hard | |||
| 99. | Warrior and Archer | | Hard | |||
| 100. | Birthday | | Hard |
There is no PDF here, and you do not need one. All 100 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 2200–4000, 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 2200-4000 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 — 100 problems is about 42 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.