| | A | Simple Arithmetics | Central Europe 2000 | 4 | 23 |
| | B | Integer Inquiry | East Central North America 1996 zjo1292 | 18 | 72 |
| | C | Niven Numbers | East Central North America 1999, Practice | 13 | 57 |
| | D | Numerically Speaking | 1997-98 North Central Regionals | 2 | 3 |
| | E | Round and Round We Go | Greater New York 2001 | 9 | 30 |
| | F | Octal Fractions | Southern African Regional 2001 | 7 | 9 |
| | G | Alice and Bob | the 2nd Annual Guangdong Collegiate Programming Contest | 3 | 8 |
| | H | NUMBER BASE CONVERSION | Greater New York 2002 | 4 | 5 |
| | I | The Idiot of the Year Contest! | 4th Iran Internet Programming Contest | 11 | 26 |
| | J | Robot Motion | Mid-Central USA 1999 | 13 | 31 |
| | K | False coin | Northeastern Europe 1998 | 4 | 4 |
| | L | Counterfeit Dollar | East Central North America 1998 | 2 | 2 |
| | M | josephus问题 | yhr | 7 | 16 |
| | N | Cipher | Central Europe 1995 | 0 | 0 |