摘要：
2.a&b+a^b=a|b; 3.若a^b=c,则a=c^b;b=a^c; 4.有3可推导出a[i]^a[i+1]^...^a[j]=sum[i-1]^sum[j](sum[i]为a[]的前i的数的异或和); 5.a>>1=a/2;a<<1=a*2; 6.啦啦啦啦啦啦,这些都是最简单最基本的,以后碰 阅读全文
摘要：
题目链接： E. XOR and Favorite Number 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 阅读全文