november 2

• More bus stop placement: this time, interactive. Also - on a circular road...
• Robot in a labyrinth - interactive.
• Choosing socks and walking in Urbana - same thing?
• What floats, and how...

Homework

1. If the drawer contains 2 red, 2 blue, 2 green, 2 yellow and 3 pink socks, how many one needs to take (not looking), to have at least 3 different colors? 4 different colors?

2. How many colors one needs to color
this map of an island, so that no two countries of the same color had a common segment of boundary?
















3. Black robot understands all the commands: UP, DOWN, LEFT, RIGHT correctly, but the white one does the opposite (you say RIGHT, it goes LEFT etc). They listen to your commands and move simultaneously. Can you make them meet,

if they start from these positions?

or from these?