The resulting value must be a nonnegative integer less than the sequence's length, and the sequence is asked to assign the assigned object to its item with that index. 最后的值必须是一个小于该序列长度的非负整数，然后该序列就被请求将被赋对象赋值给它带那个指标的项。
Given a cube of positive and negative integers, find the sub-cube with the largest sum.The sum of a cube is the sum of all the elements in that cube. 给出一个正整数和负整数组成的立方体，找出其中具有最大和的子立方体。
