与矩阵连乘最小乘法数问题类似，虽然不需要记录加括号的方式，但是需要纪录下从i乘到j的结果中为a、b、c的个数，以便在后续的计算中可以用到之前的数据，避免重复计算。所以就需要用三维数组来存储（当然用struct结构体数据类型也很方便）或者用两个数组。-With a matrix with minimal multiplication problem similar, although need not record bracketed style, but need to record from I to take the j results for a, B, C numbers, in order to follow-up calculation can be used before the data, avoid to repeat computation. So we need to use three-dimensional array to store ( of course with the structure of the struct data type is also very convenient ) or a two array.