CALayerThe CALayer class manages image-based content and allows you to perform animations on that content. Layers are often used to provide the backin...
POJ 3624 Charm Bracelet
题目链接:http://poj.org/problem?id=3624
Description
Bessie has gone to the mall's jewelry store and spies a charm bracelet. Of course, she'd like to fill it with the best charms