摘要：
Description Oleg's favorite subjects are History and Math, and his favorite branch of mathematics is division. To improve his division skills, Oleg ca 阅读全文
摘要：
Divide and Sum 题目大意 给定一个长度为$2n$的数组，将数组分成两个长度为n的数组p,q，将p从小到大排序，将q从大到小排序，对于每种分法，\(ans=\displaystyle\sum_{i=1}^{n}|p_i-q_i|\)，现在求总的答案 Solution 考虑将a先从小到大排 阅读全文