博客介绍了如何使用莫队算法快速回答区间异或和为特定值K的对数查询。通过前缀异或和与公式X^Y=K推导，能在O(1)时间内计算每个查询的答案。
XOR and Favorite Number
time limit per test 4 seconds
memory limit per test 256 megabytes
Bob has a favorite number k and ai of length n. Now he asks you to answer m queries. Each query is given by a pair li and ri and asks you to count the number of pairs of inte
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