structureless

One cannot achieve an exponential speedup by treating the problems as structureless “black boxes,” consisting of an exponential number of solutions to be tested in parallel.

是把问题看成没有结构的「黑箱」，里头有指数多个在等待平行测试的可能解，然后去出可达到指数加速的演算法，这点目前还做不到。