摘要：
E1. Doremy's Drying Plan (Easy Version) The only differences between the two versions of this problem are the constraint on $k$, the time limit and th 阅读全文
摘要：
D. XOR Construction You are given $n-1$ integers $a_1, a_2, \dots, a_{n-1}$. Your task is to construct an array $b_1, b_2, \dots, b_n$ such that: ever 阅读全文