Problems
| Problem | Category | Points | AC % | Users |
|---|---|---|---|---|
| WC '99 Suicidal P6 - Wedding Juicer | Woburn Challenge | 25 | 15.9% | 29 |
| Wesley++ | Seasonal | 15p | 9.4% | 3 |
| ACM-ICPC World Finals 2007 Problem J - Tunnels | ACM-ICPC | 40 | 21.3% | 9 |
| When GCD meets XOR | Uncategorized | 17 | 23.3% | 13 |
| Willie's Fan Club | Uncategorized | 7 | 46.1% | 28 |
| Word Wrap Cypher | Uncategorized | 7 | 32.3% | 24 |
| A Very Coordinated Christmas | Uncategorized | 7p | 34.1% | 79 |
| XOR | Fun Math | 7 | 40.0% | 260 |
| XOR Minimum | Uncategorized | 17p | 31.5% | 74 |
| XOR Sum | Fun Math | 10 | 42.2% | 144 |
| James' XOR Update | Uncategorized | 12p | 33.6% | 17 |
| Crosswords | Uncategorized | 15p | 20.0% | 4 |
| Invitation Devastation | Seasonal | 3 | 43.4% | 251 |
| Food Selection | Seasonal | 5p | 38.1% | 80 |
| Gift Wrap | Seasonal | 5 | 63.0% | 133 |
| Leftover Eggnog | Seasonal | 15p | 29.8% | 109 |
| Message to Mars | Seasonal | 20p | 12.9% | 44 |
| Tiles | Seasonal | 20p | 20.8% | 19 |
| Late Christmas Shopping | Seasonal | 3p | 31.0% | 152 |
| The 365 Days of Christmas | Seasonal | 5p | 24.6% | 131 |
| Arithmetic Snowman | Seasonal | 7p | 20.5% | 202 |
| DIY Christmas Tree | Seasonal | 10p | 34.5% | 63 |
| Eggnog Dilemma | Seasonal | 12p | 5.1% | 22 |
| Cake Balancing | Seasonal | 15p | 33.9% | 94 |
| Old Christmas Lights | Seasonal | 17p | 17.2% | 80 |
| S-NO-wall | Seasonal | 20p | 12.5% | 49 |
| Mr. N and Presents | Seasonal | 7p | 26.5% | 208 |
| Peter's Escape | Seasonal | 10p | 16.9% | 49 |
| Fibonacci Presents | Seasonal | 10 | 12.8% | 75 |
| Christmas Cozonac | Seasonal | 12p | 16.9% | 31 |
| The Christmas Swap | Seasonal | 15 | 21.2% | 45 |
| Christmas Cards | Seasonal | 15p | 23.2% | 118 |
| Santa's Deliveries | Seasonal | 25p | 19.9% | 18 |
| Boxen in Boxen | Seasonal | 25 | 6.6% | 11 |
| Happy New Year! | Seasonal | 3p | 24.6% | 192 |
| Mimi and Christmas Cake | Seasonal | 5p | 34.1% | 301 |
| World Domination Fun | Seasonal | 10p | 12.5% | 114 |
| The Polar Express | Seasonal | 7p | 22.8% | 132 |
| Hanoi Heuristics | Seasonal | 15p | 5.5% | 9 |
| Old Christmas Lights II | Seasonal | 25p | 11.9% | 54 |
| Tree of Life | Seasonal | 20p | 14.9% | 29 |
| Snowy Streets | Seasonal | 25p | 11.2% | 19 |
| Snowball Fight | Seasonal | 3 | 46.8% | 235 |
| Ball Sculpture | Seasonal | 7 | 16.4% | 99 |
| Santa's Journey | Seasonal | 7 | 6.8% | 52 |
| A Button Challenge | Seasonal | 15p | 5.5% | 7 |
| Best Hat in Town | Seasonal | 15 | 20.8% | 14 |
| Buffer Zone | Seasonal | 20 | 18.8% | 3 |
| The Order of the Fox | Seasonal | 20 | 17.0% | 25 |
| Best Hat in Town II | Seasonal | 25 | 20.3% | 27 |