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2019年6月7日
Color UVALive - 7040 (组合数 + 恰好 + 二项式反演）
摘要： Recently, Mr. Big recieved n owers from his fans. He wants to recolor those owers with m colors. The owers are put in a line. It is not allowed to col 阅读全文
posted @ 2019-06-07 21:42 Through_The_Night 阅读(279) 评论(0) 推荐(0)