Introduction - If you have any usage issues, please Google them yourself
selected from N building blocks in several pieces, and they are divided into M (1 <= M <= N) reactor, known as the first reactor, reactor No. 2, No. 3 reactor, .... Each pile has at least one building block and the first building block K heap any number greater than any of the first building block K+1 heap number (2 <= K <= M)