摘要: 来源:codeforces E. Tetrahedron 来源:codeforces E. Tetrahedron You are given a tetrahedron. Let's mark its vertices with letters A, B, C and D correspondin 阅读全文
posted @ 2018-03-10 18:12 czh~ 阅读(382) 评论(1) 推荐(0) 编辑
摘要: 来源:codeforces D. Timetable Ivan is a student at Berland State University (BSU). There are n days in Berland week, and each of these days Ivan might ha 阅读全文
posted @ 2018-03-10 17:01 czh~ 阅读(174) 评论(0) 推荐(0) 编辑