Haha try solve SelectorUnlimited antontrygubo_oyour friend Alice Bob practice fortune tellingFortune tell perform follow there wellknown array n nonnegative integer index 1 n the tellee start nonnegative number d perform operation 1 2 ldot n increase order the possible operation replace current number d d a_i replace current number d d oplus a_i hereinafter oplus denote bitwise XOR operationnotice choose operation different different different telleesone time Alice decide start d x Bob start d x 3 each perform fortune telling get particular number end Notice friend choose operation independently apply different operation iYou learn Alice Bob end number y end do not know give number Alice Bob start y find Alice Bob number y perform operation it guarantee jury test exactly friend actually get numberhacksyou hack problem