摘要：
D. Sum of XOR Functions You are given an array $a$ of length $n$ consisting of non-negative integers. You have to calculate the value of $\sum_{l=1}^{ 阅读全文
摘要：
D. Effects of Anti Pimples Chaneka has an array $[a_1,a_2,\ldots,a_n]$. Initially, all elements are white. Chaneka will choose one or more different i 阅读全文