随着所考虑的城市数量的增加，这个难题的难度将呈指数式增加。

This is a puzzle that increases exponentially in complexity with the number of cities considered.

youdao

你或许认为编码量加倍软件复杂性也相应加倍，但实际上，每增加一些编码，软件的复杂性就随之指数式增长。

You'd think that twice as much code would make your software only twice as complex. But actually, each time you increase the amount of code, your software grows exponentially more complicated.

youdao