摘要: A. Arpa and a research in Mexican wave A题里面也算简单的了…… B. Arpa and an exam about geometry 三点不共线 && |AB| == |BC| C. Five Dimensional Points 分析三维情况,在答案不为0的 阅读全文
posted @ 2017-09-05 09:43 Invisible_full_moon 阅读(149) 评论(0) 推荐(0) 编辑