@rohitalmelkar Yes. It should be computationally infeasible to discover x where f(x) can't be computed, or (x, y) where x != y but f(x) = f(y).
(Or if the construction has *other* defects, eg. z where f_inv(z) can't be computed, those should also be hard to find)
@是的。在f（x）无法计算的地方，或者（x，y）在x！=但f（x）=f（y）。
（或者，如果建筑有*其他*缺陷，例如无法计算f_inv（z）的z，这些缺陷也应该很难找到）