A2OJ Ladders
This ladder provides a structured path for users with a Codeforces Rating between 1300 to 1399. 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 1300–1399, A2OJ Ladder.
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| Status | Problem | Solve | Practice | Revision | Level | |
|---|---|---|---|---|---|---|
| 1. | Arrival of the General |  | Easy | |||
| 2. | Beautiful Matrix | | Easy | |||
| 3. | Ultra-Fast Mathematician | | Easy | |||
| 4. | Blackjack | | Easy | |||
| 5. | HQ9+ | | Easy | |||
| 6. | I_love_\%username\% | | Easy | |||
| 7. | Petya and Strings | | Easy | |||
| 8. | Cookies | | Easy | |||
| 9. | Candy Bags | | Easy | |||
| 10. | Drinks | | Easy | |||
| 11. | Vasily the Bear and Triangle | | Easy | |||
| 12. | Lunch Rush | | Easy | |||
| 13. | Cakeminator | | Easy | |||
| 14. | Stones on the Table | | Easy | |||
| 15. | Bit++ | | Easy | |||
| 16. | Levko and Table | | Easy | |||
| 17. | Young Physicist | | Easy | |||
| 18. | Chips | | Easy | |||
| 19. | Tram | | Easy | |||
| 20. | Queue at the School | | Easy | |||
| 21. | Way Too Long Words | | Easy | |||
| 22. | Present from Lena | | Easy | |||
| 23. | Jeff and Digits | | Easy | |||
| 24. | Slightly Decreasing Permutations | | Easy | |||
| 25. | Sale | | Easy | |||
| 26. | Fancy Fence | | Easy | |||
| 27. | Dragons | | Easy | |||
| 28. | The number of positions | | Easy | |||
| 29. | Translation | | Easy | |||
| 30. | Wizards and Demonstration | | Easy | |||
| 31. | Xenia and Ringroad | | Easy | |||
| 32. | Little Elephant and Rozdil | | Easy | |||
| 33. | Life Without Zeros | | Easy | |||
| 34. | Football | | Easy | |||
| 35. | Dubstep | | Easy | |||
| 36. | Magic Numbers | | Easy | |||
| 37. | String Task | | Easy | |||
| 38. | Lucky Division | | Easy | |||
| 39. | Array | | Easy | |||
| 40. | Sum of Digits | | Easy | |||
| 41. | k-String | | Easy | |||
| 42. | Puzzles | | Easy | |||
| 43. | Next Test | | Medium | |||
| 44. | Laptops | | Easy | |||
| 45. | Pashmak and Garden | | Medium | |||
| 46. | Lucky Sum | | Easy | |||
| 47. | Kuriyama Mirai's Stones | | Medium | |||
| 48. | Kitahara Haruki's Gift | | Easy | |||
| 49. | The Fibonacci Segment | | Easy | |||
| 50. | Difference Row | | Medium | |||
| 51. | Little Pigs and Wolves | | Easy | |||
| 52. | T-primes | | Medium | |||
| 53. | Xenia and Divisors | | Medium | |||
| 54. | Learning Languages | | Medium | |||
| 55. | The Child and Toy | | Medium | |||
| 56. | Sail | | Medium | |||
| 57. | Find Marble | | Medium | |||
| 58. | Free Cash | | Easy | |||
| 59. | Roma and Changing Signs | | Medium | |||
| 60. | Dreamoon and WiFi | | Medium | |||
| 61. | Dima and Staircase | | Medium | |||
| 62. | Comparing Strings | | Easy | |||
| 63. | Sereja and Array | | Medium | |||
| 64. | Sereja and Suffixes | | Easy | |||
| 65. | Pashmak and Flowers | | Medium | |||
| 66. | Simple Molecules | | Medium | |||
| 67. | DZY Loves Chessboard | | Medium | |||
| 68. | Fixed Points | | Easy | |||
| 69. | Hungry Sequence | | Medium | |||
| 70. | Building Permutation | | Medium | |||
| 71. | Road Construction | | Medium | |||
| 72. | Little Girl and Game | | Medium | |||
| 73. | Fence | | Easy | |||
| 74. | Flipping Game | | Medium | |||
| 75. | Cut Ribbon | | Medium | |||
| 76. | Ilya and Queries | | Easy | |||
| 77. | Little Dima and Equation | | Medium | |||
| 78. | George and Job | | Medium | |||
| 79. | Sereja and Bottles | | Medium | |||
| 80. | Routine Problem | | Medium | |||
| 81. | Hamburgers | | Medium | |||
| 82. | Jzzhu and Sequences | | Medium | |||
| 83. | Flag Day | | Medium | |||
| 84. | Valera and Fruits | | Medium | |||
| 85. | Fox Dividing Cheese | | Medium | |||
| 86. | Dima and Continuous Line | | Medium | |||
| 87. | Lucky Numbers (easy) | | Medium | |||
| 88. | Coach | | Medium | |||
| 89. | Ciel and Flowers | | Medium | |||
| 90. | k-Tree | | Medium | |||
| 91. | Maximum Absurdity | | Medium | |||
| 92. | Fixing Typos | | Medium | |||
| 93. | Exams | | Medium | |||
| 94. | Boredom | | Medium | |||
| 95. | Prime Matrix | | Medium | |||
| 96. | Books | | Medium | |||
| 97. | Little Girl and Maximum Sum | | Medium | |||
| 98. | Tetrahedron | | Medium | |||
| 99. | XOR and OR | | Medium | |||
| 100. | Painting Eggs | | Medium |
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 1300–1399, 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 1300-1399 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.