摘要：
XorFor given multisets AandB, find minimum non-negative xwhichA⊕x=B.Note that for A={a1,a2,…,an},A⊕x={a1⊕x,a2⊕x,…,an⊕x}.⊕stands for exclusive-or.InputThe first line contains a integer n, which denotes the size of set A(also for B).The second line contains nintegersa1,a2,…,an, which denote the set A. 阅读全文
摘要：
Square freeTest whether nis square free. nis square free if and only if for all p>1,p2is not divisors of n.InputThe first line contains an integer t, the number of test cases.The following nlines, each contains an integer n.(1≤t≤102,1≤n≤1018)OutputPrint "Yes" if nis square free, or &quo 阅读全文