2020年6月29日
C. Count Triangles
摘要： Like any unknown mathematician, Yuri has favourite numbers: AA, BB, CC, and DD, where A≤B≤C≤DA≤B≤C≤D. Yuri also likes triangles and once he thought: h 阅读全文
posted @ 2020-06-29 20:22 DeaL57 阅读(166) 评论(0) 推荐(0) 编辑