给你一个整数数组 target 和一个数组 initial ，initial 数组与 target  数组有同样的维度，且一开始全部为 0 。 请你返回从 initial 得到  target 的最少操作次数，每次操作需遵循以下规则：

You are given an integer array target. You have an integer array initial of the same size as target with all elements initially zeros. In one operation you can choose any subarray from initial and increment each value by one. Return the minimum number of…