[BZOJ4260] Codechef REBXOR
传送门http://www.lydsy.com/JudgeOnline/problem.php?id=4260题目大意给定序列,求最大的(xl1 xor xl1+1 xor ...xr1)+(xl2 xor xl2+1 xor ...xr2)(x_{l1}~xor~x_{l1+1}~xor~...x_{r1})+(x_{l2}~xor~x_{l2+1}~xor~...x_{r2})题解xor是支持交