Problems
| Problem Name | Code | Points | Users | AC Rate | Date Added |
|---|---|---|---|---|---|
| NOI '97 - Competition Ranking | noi97p1 | 7 | 28 | 28.36% | 2014-04-27 |
| NOI '97 - Optimal Routing | noi97p2 | 12p | 42 | 26.70% | 2014-04-27 |
| NOI '97 - File Matching | noi97p3 | 25p | 0 | 0.00% | 2014-04-27 |
| NOI '97 - Perfect Tour | noi97p4 | 5 | 99 | 31.17% | 2014-04-27 |
| NOI '97 - Building Game | noi97p5 | 15p | 16 | 22.99% | 2014-04-27 |
| NOI '97 - Satellite Coverage | noi97p6 | 17p | 17 | 37.50% | 2014-04-27 |
| NOI '98 - Personal Income Tax | noi98p1 | 7 | 10 | 52.00% | 2014-05-01 |
| NOI '98 - Free Pizza | noi98p2 | 15p | 7 | 13.79% | 2014-05-01 |
| NOI '98 - Software Installation Disk | noi98p3 | 15p | 4 | 56.25% | 2014-05-01 |
| NOI '98 - Scarf Cutting | noi98p4 | 15p | 4 | 26.67% | 2014-05-01 |
| NOI '98 - SERNET Simulation | noi98p5 | 12p | 7 | 7.38% | 2014-05-01 |
| NOI '98 - Parallel Computing | noi98p6 | 25p | 0 | 0.00% | 2014-05-01 |
| NOI '99 - 01 Sequence | noi99p1 | 20p | 7 | 20.51% | 2014-05-04 |
| NOI '99 - Nails and Ball | noi99p2 | 15p | 6 | 13.64% | 2014-05-04 |
| NOI '99 - Birthday Cake | noi99p3 | 20p | 2 | 5.00% | 2014-05-04 |
| NOI '99 - Chessboard Division | noi99p4 | 15p | 5 | 19.23% | 2014-05-04 |
| NOI '99 - Optimally Connected Subset | noi99p5 | 15p | 11 | 84.62% | 2014-05-04 |
| NOI '99 - Memory Allocation | noi99p6 | 20p | 2 | 20.00% | 2014-05-04 |
| NOI '00 - Ceramic Necklace | noi00p1 | 5 | 30 | 27.42% | 2014-05-06 |
| NOI '00 - Program Parser | noi00p2 | 12p | 6 | 16.18% | 2014-05-06 |
| NOI '00 - Mystery of the Lost City | noi00p3 | 17p | 4 | 35.71% | 2014-05-06 |
| NOI '00 - Trie | noi00p4 | 7 | 70 | 51.60% | 2014-05-06 |
| NOI '00 - Frogs Crossing the River | noi00p5 | 10 | 62 | 30.67% | 2014-05-06 |
| NOI '00 - Symbol Deciphering | noi00p6 | 40p | 0 | 0.00% | 2014-05-06 |
| NOI '01 - Food Chain | noi01p1 | 15p | 23 | 19.61% | 2014-05-08 |
| NOI '01 - Artillery Positioning | noi01p2 | 20p | 20 | 20.59% | 2014-05-08 |
| NOI '01 - The Clever Typist | noi01p3 | 15p | 14 | 28.79% | 2014-05-08 |
| NOI '01 - Applications of Arctangent | noi01p4 | 15 | 28 | 19.00% | 2014-05-08 |
| NOI '01 - Equation Solutions | noi01p5 | 15p | 25 | 13.99% | 2014-05-08 |
| NOI '01 - Secret of the Meteorite | noi01p6 | 20p | 10 | 35.48% | 2014-05-08 |
| NOI '02 - Legend of the Galactic Heroes | noi02p1 | 15p | 48 | 22.00% | 2014-05-11 |
| NOI '02 - The Greedy Kuzuryū | noi02p3 | 25p | 33 | 21.51% | 2014-05-11 |
| NOI '02 - Island of Cavemen | noi02p4 | 20p | 11 | 12.70% | 2014-05-11 |
| NOI '02 - New Tetris | noi02p5 | 30p | 2 | 66.67% | 2014-05-11 |
| NOI '02 - Robot No. M | noi02p6 | 25p | 11 | 70.83% | 2014-05-11 |
| NOI '03 - Stick Game | noi03p1 | 15p | 4 | 36.36% | 2014-05-16 |
| NOI '03 - Text Editor | noi03p2 | 30p | 13 | 31.40% | 2014-05-16 |
| NOI '03 - Data Generator | noi03p4 | 20p | 22 | 18.18% | 2014-05-17 |
| NOI '03 - ZPLHZ | noi03p6 | 25p | 1 | 1.85% | 2014-05-18 |
| NOI '04 - The Depressed Cashier | noi04p1 | 20p | 41 | 11.85% | 2014-05-19 |
| NOI '04 - Manhattan | noi04p3 | 25p | 7 | 12.90% | 2014-05-19 |
| NOI '04 - Rainfall | noi04p4 | 25p | 2 | 20.00% | 2014-05-19 |
| NOI '04 - Little H's Little Hut | noi04p5 | 20p | 1 | 25.00% | 2014-05-19 |
| NOI '05 - The Magnificent Waltz | noi05p1 | 20p | 19 | 29.73% | 2014-06-02 |
| NOI '05 - Maintaining a Sequence | noi05p2 | 40p | 33 | 28.26% | 2014-06-02 |
| NOI '05 - Wisdom Beads Game | noi05p3 | 40p | 4 | 18.52% | 2014-06-02 |
| NOI '05 - CongCong and KoKo | noi05p4 | 20p | 26 | 19.38% | 2014-06-02 |
| NOI '05 - Little H's Party | noi05p5 | 30p | 1 | 2.76% | 2014-06-02 |
| NOI '05 - Lemon Tree Under the Moon | noi05p6 | 50p | 2 | 30.00% | 2014-06-02 |
| NOI '06 - Network Charges | noi06p1 | 20p | 14 | 24.39% | 2014-07-23 |
