| 2400 | Bridge Bidding | 21.99%(42/191) |
| 2401 | Baskets of Gold Coins | 58.82%(2284/3883) |
| 2402 | Toothpick Arithmetic | 30.84%(136/441) |
| 2403 | Human Knot | 21.19%(25/118) |
| 2404 | Permutation Recovery | 64.75%(507/783) |
| 2405 | Marbles in Three Baskets | 26.75%(88/329) |
| 2406 | Doors and Penguins | 19.85%(53/267) |
| 2407 | Knots | 67.95%(354/521) |
| 2408 | String Equations | 12.23%(34/278) |
| 2409 | Team Arrangement | 25.61%(251/980) |
| 2410 | Barbara Bennett's Wild Numbers | 47.42%(294/620) |
| 2411 | Calculating Taxi Fare | 11.53%(34/295) |
| 2412 | Party at Hali-Bula | 37.47%(1402/3742) |
| 2413 | Against Mammoths | 33.36%(376/1127) |
| 2414 | Chessboard Dance | 44.02%(173/393) |
| 2415 | Bribing FIPA | 31.62%(616/1948) |
| 2416 | Treasure of the Chimp Island | 45.88%(267/582) |
| 2417 | Kadj Squares | 22.49%(83/369) |
| 2418 | Another Easy Problem | 18.15%(183/1008) |
| 2419 | Boring Game | 23.29%(351/1507) |
| 2420 | Cube and Caterpillar | 2.13%(5/235) |
| 2421 | Deciphering Password | 29.27%(829/2832) |
| 2422 | Essay Scoring System | 0.00%(0/129) |
| 2423 | Find A Way | 10.66%(37/347) |
| 2424 | Gary's Calculator | 25.48%(342/1342) |
| 2425 | Hiking Trip | 46.75%(1051/2248) |
| 2426 | Interesting Housing Problem | 34.19%(1710/5001) |
| 2427 | Judges's Final Problem | 3.35%(6/179) |
| 2428 | Stars | 34.34%(658/1916) |
| 2429 | Word Game | 28.21%(325/1152) |
| 2430 | Beans | 32.46%(697/2147) |
| 2431 | Counting Problem | 54.05%(340/629) |
| 2432 | Farey Sequence Again | 24.01%(164/683) |
| 2433 | Travel | 33.02%(1560/4725) |
| 2434 | Let's play UNO | 18.33%(46/251) |
| 2435 | There is a war | 32.19%(424/1317) |
| 2436 | Collision Detection | 34.19%(615/1799) |
| 2437 | Jerboas | 27.42%(593/2163) |
| 2438 | Turn the corner | 42.91%(2028/4726) |
| 2439 | The Mussels | 45.67%(274/600) |
| 2440 | Watch out the Animal | 51.44%(286/556) |
| 2441 | ACM(Array Complicated Manipulation) | 26.64%(175/657) |
| 2442 | Bricks | 41.14%(267/649) |
| 2443 | Counter Strike | 30.91%(272/880) |
| 2444 | The Accomodation of Students | 42.39%(6240/14720) |
| 2445 | Little White's Explore | 0.00%(0/80) |
| 2446 | Shell Pyramid | 35.31%(1667/4721) |
| 2447 | K-dimension number | 24.01%(399/1662) |
| 2448 | Mining Station on the Sea | 31.40%(1204/3834) |
| 2449 | Gauss Elimination | 25.80%(420/1628) |
| 2450 | Searching Treasure in Deep Sea | 0.00%(0/100) |
| 2451 | Simple Addition Expression | 40.95%(799/1951) |
| 2452 | Navy maneuvers | 38.64%(422/1092) |
| 2453 | Carrying Out A Task | 25.82%(190/736) |
| 2454 | Degree Sequence of Graph G | 43.84%(2262/5160) |
| 2455 | Dividing Sea Area to Navigation-Triangle | 0.00%(0/110) |
| 2456 | Constellations | 21.74%(253/1164) |
| 2457 | DNA repair | 51.62%(2383/4616) |
| 2458 | Kindergarten | 51.99%(914/1758) |
| 2459 | Maximum repetition substring | 27.46%(508/1850) |
| 2460 | Network | 29.80%(1245/4178) |
| 2461 | Rectangles | 51.85%(1038/2002) |
| 2462 | The Luckiest number | 30.59%(835/2730) |
| 2463 | USTC campus network | 37.28%(353/947) |
| 2464 | A Pair of Graphs | 52.85%(557/1054) |
| 2465 | Binary Integer | 23.83%(46/193) |
| 2466 | Cryptography Reloaded | 33.49%(294/878) |
| 2467 | Déjà vu | 20.46%(258/1261) |
| 2468 | Experiment on a … “Cable” | 28.25%(102/361) |
| 2469 | Fire-Control System | 18.59%(455/2448) |
| 2470 | Get-Together at Stockholm | 43.20%(419/970) |
| 2471 | History of Languages | 31.01%(262/845) |
| 2472 | Image Processing | 3.17%(4/126) |
| 2473 | Junk-Mail Filter | 30.16%(4832/16023) |
| 2474 | Process scheduling | 34.69%(646/1862) |
| 2475 | Box | 30.19%(1452/4810) |
| 2476 | String painter | 48.38%(5818/12026) |
| 2477 | Crop circles | 20.38%(108/530) |
| 2478 | Slides | 35.39%(441/1246) |
| 2479 | Kingdoms | 3.98%(8/201) |
| 2480 | Steal the Treasure | 31.54%(310/983) |
| 2481 | Toy | 51.20%(578/1129) |
| 2482 | Transit search | 36.93%(383/1037) |
| 2483 | Counting square | 53.20%(648/1218) |
| 2484 | Build the Tower | 28.44%(64/225) |
| 2485 | Destroying the bus stations | 34.20%(1392/4070) |
| 2486 | A simple stone game | 55.52%(694/1250) |
| 2487 | Ugly Windows | 40.87%(813/1989) |
| 2488 | Tornado | 19.17%(88/459) |
| 2489 | Minimal Ratio Tree | 32.94%(2014/6115) |
| 2490 | Parade | 44.06%(638/1448) |
| 2491 | Priest John's Busiest Day | 31.34%(672/2144) |
| 2492 | Ping pong | 36.58%(2736/7479) |
| 2493 | Timer | 31.66%(189/597) |
| 2494 | Elevator | 15.84%(89/562) |
| 2495 | MC part deux | 29.81%(31/104) |
| 2496 | Moveable maze | 10.20%(10/98) |
| 2497 | Pick up sticks | 25.75%(120/466) |
| 2498 | Digits | 40.05%(173/432) |
| 2499 | Rotate to root | 34.33%(80/233) |
