2018南昌網絡賽K題

題目鏈接：https://nanti.jisuanke.com/t/38230 Description Given a sequence of nn numbers a1,a2,…,anand three functions. Define a function f(l,r)f(l,r) which returns ⊕a[x] (l≤x≤r). The ⊕ represents exclusive

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