Besonderhede van voorbeeld: 8129265550467242662

English

One key to the solution is, it does not have to be built in ascending (or descending) order; it can be built piecewise, with pieces starting from different givens.

Chinese

解决方案的一个关键是:没有必要以升序(或降序)构建;可以分片构建,各分片从不同的已知条件来开始。