2019南昌邀请赛-F

F - Sequence Oldjang has a sequence A of length n , the i t h number in which is A i . He defined a function f ( l , r ) = a l ⊕ a l + 1 ⊕ ⋯ ⊕ a r . It is simple for the cleverest boy oldjang to calcu

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