2020年4月5日
[省赛训练]How many nines
摘要： 题面： If we represent a date in the format YYYY-MM-DD (for example, 2017-04-09), do you know how many 9s will appear in all the dates between Y1-M1-D1 a 阅读全文
posted @ 2020-04-05 21:46 IrIrIrllleaf 阅读(153) 评论(0) 推荐(0)
[省赛训练（DP）]Course Selection System
摘要： 题面： There are n courses in the course selection system of Marjar University. The i-th course is described by two values: happiness Hi and credit Ci. I 阅读全文
posted @ 2020-04-05 21:29 IrIrIrllleaf 阅读(293) 评论(0) 推荐(0)