A2OJ Ladders
This sheet is tailored for beginners, unrated users, or those with a Codeforces rating below 1300. It focuses on building a solid foundation in competitive programming by covering fundamental concepts and patterns. Ideal for those looking to kickstart their competitive journey, the sheet ensures you gain the skills and confidence to tackle problems effectively and improve your rating over time.
Also known as ACD Ladder 800–1299, A2OJ Ladder.
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| Status | Problem | Solve | Practice | Revision | Level | |
|---|---|---|---|---|---|---|
| 1. | Young Physicist |  | Easy | |||
| 2. | Beautiful Matrix | | Easy | |||
| 3. | Queue at the School | | Easy | |||
| 4. | Borze | | Easy | |||
| 5. | Beautiful Year | | Easy | |||
| 6. | Lights Out | | Easy | |||
| 7. | Word | | Easy | |||
| 8. | Word Capitalization | | Easy | |||
| 9. | Nearly Lucky Number | | Easy | |||
| 10. | Stones on the Table | | Easy | |||
| 11. | Panoramix's Prediction | | Easy | |||
| 12. | Ultra-Fast Mathematician | | Easy | |||
| 13. | Perfect Permutation | | Easy | |||
| 14. | Arrival of the General | | Easy | |||
| 15. | Drinks | | Easy | |||
| 16. | Insomnia cure | | Easy | |||
| 17. | Cupboards | | Easy | |||
| 18. | I_love_\%username\% | | Easy | |||
| 19. | Tram | | Easy | |||
| 20. | Helpful Maths | | Easy | |||
| 21. | Is your horseshoe on the other hoof? | | Easy | |||
| 22. | Way Too Long Words | | Easy | |||
| 23. | Boy or Girl | | Easy | |||
| 24. | Amusing Joke | | Easy | |||
| 25. | Soft Drinking | | Easy | |||
| 26. | HQ9+ | | Easy | |||
| 27. | Petya and Strings | | Easy | |||
| 28. | Team | | Easy | |||
| 29. | Bit++ | | Easy | |||
| 30. | Effective Approach | | Easy | |||
| 31. | Dima and Friends | | Easy | |||
| 32. | Jzzhu and Children | | Easy | |||
| 33. | Supercentral Point | | Easy | |||
| 34. | Petr and Book | | Easy | |||
| 35. | Parallelepiped | | Easy | |||
| 36. | Reconnaissance 2 | | Easy | |||
| 37. | Even Odds | | Easy | |||
| 38. | Little Elephant and Rozdil | | Easy | |||
| 39. | Hexadecimal's theorem | | Easy | |||
| 40. | Jeff and Digits | | Easy | |||
| 41. | Xenia and Ringroad | | Easy | |||
| 42. | Magic Numbers | | Easy | |||
| 43. | Translation | | Easy | |||
| 44. | Football | | Easy | |||
| 45. | Bicycle Chain | | Easy | |||
| 46. | Sale | | Easy | |||
| 47. | System of Equations | | Easy | |||
| 48. | Business trip | | Easy | |||
| 49. | Dubstep | | Easy | |||
| 50. | k-String | | Easy | |||
| 51. | The number of positions | | Easy | |||
| 52. | Football | | Easy | |||
| 53. | String Task | | Easy | |||
| 54. | Little Elephant and Function | | Easy | |||
| 55. | Present from Lena | | Easy | |||
| 56. | Dragons | | Easy | |||
| 57. | Puzzles | | Easy | |||
| 58. | Chat room | | Easy | |||
| 59. | Airport | | Easy | |||
| 60. | DZY Loves Chessboard | | Medium | |||
| 61. | Pashmak and Flowers | | Medium | |||
| 62. | Jeff and Periods | | Medium | |||
| 63. | Little Girl and Game | | Medium | |||
| 64. | Sail | | Medium | |||
| 65. | Shower Line | | Medium | |||
| 66. | Shooshuns and Sequence | | Medium | |||
| 67. | Xenia and Divisors | | Medium | |||
| 68. | Letter | | Easy | |||
| 69. | Kitahara Haruki's Gift | | Easy | |||
| 70. | Comparing Strings | | Easy | |||
| 71. | Hungry Sequence | | Medium | |||
| 72. | Big Segment | | Easy | |||
| 73. | Little Elephant and Bits | | Easy | |||
| 74. | Yaroslav and Permutations | | Easy | |||
| 75. | Fence | | Easy | |||
| 76. | TL | | Medium | |||
| 77. | Increase and Decrease | | Medium | |||
| 78. | Two Bags of Potatoes | | Medium | |||
| 79. | Unlucky Ticket | | Easy | |||
| 80. | Boys and Girls | | Easy | |||
| 81. | Easy Number Challenge | | Medium | |||
| 82. | Pythagorean Theorem II | | Medium | |||
| 83. | Cards with Numbers | | Medium | |||
| 84. | Domino | | Medium | |||
| 85. | Cinema Line | | Easy | |||
| 86. | Rank List | | Easy | |||
| 87. | Cut Ribbon | | Medium | |||
| 88. | IQ Test | | Easy | |||
| 89. | Building Permutation | | Medium | |||
| 90. | Kuriyama Mirai's Stones | | Medium | |||
| 91. | T-primes | | Medium | |||
| 92. | Sereja and Suffixes | | Easy | |||
| 93. | Flipping Game | | Medium | |||
| 94. | Free Cash | | Easy | |||
| 95. | Polo the Penguin and Matrix | | Medium | |||
| 96. | Jzzhu and Sequences | | Medium | |||
| 97. | Appleman and Card Game | | Medium | |||
| 98. | Sort the Array | | Medium | |||
| 99. | Sereja and Bottles | | Medium | |||
| 100. | Adding Digits | | 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 800–1299, 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 800-1299: 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.