A2OJ Ladders
This ladder provides a structured path for users with a Codeforces Rating between 2100 to 2199. 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 2100–2199, A2OJ Ladder.
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Easy
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Medium
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Hard
| Status | Problem | Solve | Practice | Revision | Level | |
|---|---|---|---|---|---|---|
| 1. | Anton and Letters |  | Easy | |||
| 2. | Watching a movie | | Easy | |||
| 3. | Expression | | Easy | |||
| 4. | Caisa and Pylons | | Easy | |||
| 5. | Appleman and Easy Task | | Easy | |||
| 6. | DZY Loves Strings | | Easy | |||
| 7. | DZY Loves Hash | | Easy | |||
| 8. | inc ARG | | Easy | |||
| 9. | Inbox (100500) | | Easy | |||
| 10. | Mike and Fax | | Easy | |||
| 11. | Caisa and Sugar | | Medium | |||
| 12. | Laptops | | Easy | |||
| 13. | Set of Strings | | Easy | |||
| 14. | DZY Loves Chessboard | | Medium | |||
| 15. | Fedya and Maths | | Medium | |||
| 16. | Andrey and Problem | | Hard | |||
| 17. | Suffix Structures | | Medium | |||
| 18. | Towers | | Medium | |||
| 19. | Kyoya and Permutation | | Hard | |||
| 20. | Kolya and Tandem Repeat | | Medium | |||
| 21. | Sea and Islands | | Medium | |||
| 22. | Writing Code | | Hard | |||
| 23. | Interesting Array | | Hard | |||
| 24. | DZY Loves Sequences | | Medium | |||
| 25. | DZY Loves Physics | | Medium | |||
| 26. | Maximum Xor Secondary | | Hard | |||
| 27. | Two Sets | | Hard | |||
| 28. | Maximum Value | | Hard | |||
| 29. | Jeff and Permutation | | Hard | |||
| 30. | Case of Fugitive | | Hard | |||
| 31. | Main Sequence | | Hard | |||
| 32. | Gargari and Permutations | | Hard | |||
| 33. | Vanya and Scales | | Hard | |||
| 34. | Appleman and Tree | | Hard | |||
| 35. | Soldier and Number Game | | Medium | |||
| 36. | Propagating tree | | Hard | |||
| 37. | Array and Operations | | Hard | |||
| 38. | Restore Cube | | Hard | |||
| 39. | Dima and Trap Graph | | Hard | |||
| 40. | Civilization | | Hard | |||
| 41. | Destroying Roads | | Hard | |||
| 42. | Painting Fence | | Hard | |||
| 43. | Little Pony and Summer Sun Celebration | | Hard | |||
| 44. | Shifting | | Hard | |||
| 45. | Gargari and Bishops | | Hard | |||
| 46. | Appleman and a Sheet of Paper | | Hard | |||
| 47. | Jzzhu and Chocolate | | Medium | |||
| 48. | Drazil and Tiles | | Hard | |||
| 49. | Kalila and Dimna in the Logging Industry | | Hard | |||
| 50. | Equivalent Strings | | Medium | |||
| 51. | Substitutes in Number | | Hard | |||
| 52. | Jzzhu and Cities | | Hard | |||
| 53. | Information Graph | | Hard | |||
| 54. | Mike and Foam | | Hard | |||
| 55. | Brackets in Implications | | Hard | |||
| 56. | Hill Climbing | | Hard | |||
| 57. | Divisors | | Hard | |||
| 58. | Tree Requests | | Hard | |||
| 59. | DZY Loves FFT | | Hard | |||
| 60. | Guess the Tree | | Hard | |||
| 61. | Caisa and Tree | | Hard | |||
| 62. | Darth Vader and Tree | | Hard | |||
| 63. | Prefix Product Sequence | | Hard | |||
| 64. | Traffic Jams in the Land | | Hard | |||
| 65. | Name That Tune | | Hard | |||
| 66. | Mr. Kitayuta's Colorful Graph | | Hard | |||
| 67. | Tricky Function | | Hard | |||
| 68. | Drazil and Park | | Hard | |||
| 69. | The Child and Sequence | | Hard | |||
| 70. | Road Improvement | | Hard | |||
| 71. | Dreamoon and Strings | | Hard | |||
| 72. | Fox And Dinner | | Hard | |||
| 73. | Jzzhu and Numbers | | Hard | |||
| 74. | Adam and Tree | | Hard | |||
| 75. | Remembering Strings | | Hard | |||
| 76. | Alex and Complicated Task | | Hard | |||
| 77. | Tree and Queries | | Hard | |||
| 78. | Tachibana Kanade's Tofu | | Hard | |||
| 79. | DZY Loves Strings | | Hard | |||
| 80. | Guess Your Way Out! II | | Hard | |||
| 81. | XOR and Favorite Number | | Hard | |||
| 82. | Volcanoes | | Hard | |||
| 83. | Artem and Array | | Hard | |||
| 84. | Arthur and Walls | | Hard | |||
| 85. | Fedor and Essay | | Hard | |||
| 86. | Pig and Palindromes | | Hard | |||
| 87. | GukiZ and Binary Operations | | Hard | |||
| 88. | Hack it! | | Hard | |||
| 89. | Case of a Top Secret | | Hard | |||
| 90. | GukiZ and GukiZiana | | Hard | |||
| 91. | DZY Loves Fibonacci Numbers | | Hard | |||
| 92. | Jzzhu and Apples | | Hard | |||
| 93. | Vowels | | Hard | |||
| 94. | Ciel and Gondolas | | Hard | |||
| 95. | Game with Strings | | Hard | |||
| 96. | Helping People | | Hard | |||
| 97. | Mike and Fish | | Hard | |||
| 98. | Mike and Friends | | Hard | |||
| 99. | Serega and Fun | | Hard | |||
| 100. | Function | | 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 2100–2199, 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 2100-2199 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.