CISRA Puzzle Competition 2008 - Hints

This is the archive of the 2008 Puzzle Competition. Please visit the current competition site for information about the latest Puzzle Competition.

B.3 Flowchart

• Note that one of the circles has no incoming arrows, one circle has one incoming arrow, and the others all have two incoming arrows.
• The circle with no incoming arrows is a good starting point. Put a 1 there. What numbers would go elsewhere?
• The number in each circle is the number of unique paths for getting to that circle.