| 2018F2 | Speedbreaker Counting (Medium Version) | | | 3000 | 301 |
| 2018F3 | Speedbreaker Counting (Hard Version) | | | 3100 | 339 |
| 2014A | Robin Helps | | | 800 | 46.4k |
| 2014B | Robin Hood and the Major Oak | | | 800 | 33.8k |
| 2014C | Robin Hood in Town | | | 1100 | 28k |
| 2014D | Robert Hood and Mrs Hood | | | 1400 | 16.3k |
| 2014E | Rendez-vous de Marian et Robin | | | 1800 | 9.3k |
| 2014F | Sheriff's Defense | | | 2000 | 5.3k |
| 2014G | Milky Days | | | 2200 | 1.8k |
| 2014H | Robin Hood Archery | | | 1900 | 6k |
| 2013A | Zhan's Blender | | | 800 | 31.5k |
| 2013B | Battle for Survive | | | 900 | 28.7k |
| 2013C | Password Cracking | | | 1400 | 14.9k |
| 2013D | Minimize the Difference | | | 1900 | 7.6k |
| 2013E | Prefix GCD | | | 2200 | 4.4k |
| 2013F1 | Game in Tree (Easy Version) | | | 2700 | 679 |
| 2013F2 | Game in Tree (Hard Version) | | | 3500 | 171 |
| 2011A | Problem Solving | | | unrated | 1.1k |
| 2011B | Shuffle | | | unrated | 679 |
| 2011C | Split the Expression | | | unrated | 382 |
| 2011D | Among Wolves | | | unrated | 285 |
| 2011E | Rock-Paper-Scissors Bot | | | unrated | 185 |
| 2011F | Good Subarray | | | unrated | 132 |
| 2011G | Removal of a Permutation | | | unrated | 51 |
| 2011H | Strange Matrix | | | unrated | 58 |
| 2011I | Stack and Queue | | | unrated | 24 |
| 2010A | Alternating Sum of Numbers | | | 800 | 21.5k |
| 2010B | Three Brothers | | | 800 | 25k |
| 2010C1 | Message Transmission Error (easy version) | | | 1400 | 9.4k |
| 2010C2 | Message Transmission Error (hard version) | | | 1700 | 4.8k |
| 2009A | Minimize! | | | 800 | 75.1k |
| 2009B | osu!mania | | | 800 | 54.2k |
| 2009C | The Legend of Freya the Frog | | | 1100 | 33.7k |
| 2009D | Satyam and Counting | | | 1400 | 19.2k |
| 2009E | Klee's SUPER DUPER LARGE Array!!! | | | 1400 | 18.1k |
| 2009F | Firefly's Queries | | | 1700 | 8.7k |
| 2009G1 | Yunli's Subarray Queries (easy version) | | | 1900 | 5.6k |
| 2009G2 | Yunli's Subarray Queries (hard version) | | | 2200 | 1.8k |
| 2009G3 | Yunli's Subarray Queries (extreme version) | | | 2700 | 554 |
| 2008A | Sakurako's Exam | | | 800 | 42.3k |
| 2008B | Square or Not | | | 800 | 33.3k |
| 2008C | Longest Good Array | | | 800 | 37k |
| 2008D | Sakurako's Hobby | | | 1100 | 23.9k |
| 2008E | Alternating String | | | 1500 | 13.8k |
| 2008F | Sakurako's Box | | | 1400 | 16k |
| 2008G | Sakurako's Task | | | 1800 | 6.8k |
| 2008H | Sakurako's Test | | | 2100 | 3.7k |
| 2007A | Dora's Set | | | 800 | 25.5k |
| 2007B | Index and Maximum Value | | | 900 | 26k |
| 2007C | Dora and C++ | | | 1500 | 16.4k |
| 2006A | Iris and Game on the Tree | | | 1700 | 9.8k |
| 2006B | Iris and the Tree | | | 1800 | 4.4k |
| 2006C | Eri and Expanded Sets | | | 2300 | 2.1k |
| 2006D | Iris and Adjacent Products | | | 2600 | 997 |
| 2006E | Iris's Full Binary Tree | | | 3100 | 328 |
| 2006F | Dora's Paint | | | 3500 | 174 |
| 2005A | Simple Palindrome | | | 900 | 26.7k |
| 2005B1 | The Strict Teacher (Easy Version) | | | 1000 | 25.2k |
| 2005B2 | The Strict Teacher (Hard Version) | | | 1200 | 22.2k |
| 2005C | Lazy Narek | | | 1800 | 8.8k |
| 2005D | Alter the GCD | | | 2400 | 1.3k |
| 2005E1 | Subtangle Game (Easy Version) | | | 2100 | 3.4k |
| 2005E2 | Subtangle Game (Hard Version) | | | 2500 | 1.1k |
| 2004A | Closest Point | | | 800 | 34k |
| 2004B | Game with Doors | | | 1000 | 32.1k |
| 2004C | Splitting Items | | | 1100 | 27.5k |
| 2004D | Colored Portals | | | 1600 | 13.5k |
| 2004E | Not a Nim Problem | | | 2100 | 5.2k |
| 2004F | Make a Palindrome | | | 2600 | 1.4k |
| 2004G | Substring Compression | | | 3200 | 425 |
| 2003A | Turtle and Good Strings | | | 800 | 32.9k |
| 2003B | Turtle and Piggy Are Playing a Game 2 | | | 800 | 27.7k |
| 2003C | Turtle and Good Pairs | | | 1200 | 22k |
| 2003D1 | Turtle and a MEX Problem (Easy Version) | | | 1500 | 13.7k |
| 2003D2 | Turtle and a MEX Problem (Hard Version) | | | 2100 | 4.7k |
| 2003E1 | Turtle and Inversions (Easy Version) | | | 2600 | 902 |
| 2003E2 | Turtle and Inversions (Hard Version) | | | 2700 | 654 |
| 2003F | Turtle and Three Sequences | | | 2800 | 838 |
| 2002A | Distanced Coloring | | | 800 | 21.4k |
| 2002B | Removals Game | | | 1000 | 23.4k |
| 2002C | Black Circles | | | 1200 | 18k |
| 2002D1 | DFS Checker (Easy Version) | | | 1900 | 5.2k |
| 2002D2 | DFS Checker (Hard Version) | | | 2300 | 2.9k |
| 2002E | Cosmic Rays | | | 2300 | 3k |
| 2002F1 | Court Blue (Easy Version) | | | 2600 | 1k |
| 2002F2 | Court Blue (Hard Version) | | | 2800 | 597 |
| 2002G | Lattice Optimizing | | | 3400 | 292 |
| 2002H | Counting 101 | | | 3500 | 104 |
| 2001A | Make All Equal | | | 800 | 33.1k |
| 2001B | Generate Permutation | | | 800 | 26.3k |
| 2001C | Guess The Tree | | | 1500 | 13.1k |
| 2001D | Longest Max Min Subsequence | | | 1900 | 6.6k |
| 2001E1 | Deterministic Heap (Easy Version) | | | 2400 | 1.6k |
| 2001E2 | Deterministic Heap (Hard Version) | | | 2900 | 303 |
| 2000A | Primary Task | | | 800 | 44.7k |
| 2000B | Seating in a Bus | | | 800 | 41.3k |
| 2000C | Numeric String Template | | | 1000 | 32k |
| 2000D | Right Left Wrong | | | 1200 | 29.6k |
| 2000E | Photoshoot for Gorillas | | | 1400 | 16.6k |
| 2000F | Color Rows and Columns | | | 1900 | 7.1k |