## Rubric

**The aim of the Challenges:**

Solve as many problems as you can in 40 minutes.

You are not expected to finish!

**Rules:**

The problems come in three levels of difficulty: A, B and C.

The "A" problems are the easiest. "C" problems the hardest.

You can find a problem's difficulty in the problem overview before you click on it. The difficulty of a problem determines how it will be scored.

The scoring rules are as follows:

Difficulty | Correct | Incorrect | Unanswered |
---|---|---|---|

A | +6 points | 0 points | 0 points |

B | +9 points | -2 points | 0 points |

C | +12 points | -4 points | 0 points |