给定n个矩阵A1，A2，…，An，其中，Ai与Aj+1是可乘的，i=1，2，…，n-l。

你的任务是要确定矩阵连乘的运算次序，使计算这n个矩阵的连乘积A1A2…An时总的元素乘法次数达到最少。

-Given n matrices A1, A2, ..., An, which, Ai and Aj+1 is multiplicative in, i = 1,2, ..., nl. Your task is to determine the matrix multiplication operation with the order to calculate the product of n matrices even when A1A2 ... An element of the total number of multiplications to a minimum.