摘要: P4462 [CQOI2018]异或序列 Problem: https://www.luogu.com.cn/problem/P4462 Solution: 求出异或前缀和sum[],对于 a[ l ] ^ a[ l + 1] ^ .... ^ a[ r ] 就变成了sum[ r ] ^ sum[ 阅读全文
posted @ 2021-01-28 12:06 Choose_and_be_chosen 阅读(172) 评论(0) 推荐(0) 编辑