Minimize the operations

You are given an array nums (0-indexed) with N integers. In one operation, you can choose an element of the array and increment it by 1. you can perform operations any number of times. An array nums is strictly decreasing if nums[i] > nums[i+1] for all 0 <= i < nums.length - 1. Return the minimum number of operations needed to make nums strictly decreasing. For example input- nums = [1,1,1]