摘要：
Problem D: The NecklaceMy little sister had a beautiful necklace made of colorful beads. Two successive beads in the necklace shared a common color at their meeting point. The figure below shows a segment of the necklace:But, alas! One day, the necklace was torn and the beads were all scattered ove. 阅读全文
摘要：
Problem A: The MonocycleA monocycle is a cycle that runs on one wheel and the one we will be considering is a bit more special. It has a solid wheel colored with five different colors as shown in the figure:The colored segments make equal angles (72o) at the center. A monocyclist rides this cycle o. 阅读全文