摘要：
Manthan, Codefest 19 (open for everyone, rated, Div. 1 + Div. 2) F. Bits And Pieces 题意 给定一个$n$个数字组成的数组$a$ 问当索引$i,j,k$满足$i\lt j\lt k$时，$a_i|(a_j&a_k)$的 阅读全文
摘要：
Codeforces Round #559 (Div. 1) D. Winding polygonal line Codeforces Round #559 (Div. 2) F. Winding polygonal line 题意 给定$n$个点及一串长度为$n-2$的字符串，字符串仅为$L$与$ 阅读全文