2020年5月23日
状压汇总
摘要： SGU 222: 很明显答案是$C_n^k A_n^k$ Code cpp define B cout include include include include include include define LL long long const int inf = 1e9 + 9; const 阅读全文
posted @ 2020-05-23 22:56 优秀的渣渣禹 阅读(182) 评论(0) 推荐(0) 编辑