2016年8月2日
uva10167 Birthday Cake
摘要： Lucy and Lily are twins. Today is their birthday. Mother buys a birthday cake for them. Now we put the cake onto a Descartes coordinate. Its center is 阅读全文
posted @ 2016-08-02 17:33 keshuqi 阅读(179) 评论(0) 推荐(0) 编辑