[题目地址](https://leetcode.cn/problems/replace-elements-with-greatest-element-on-right-side/description) + 使用`slices.Backward`反转切片直接简化操作 ```golang func replaceElements(arr []int) []int { var maxNum int = -1 for i, item := range slices.Backward(arr){ arr[i] = maxNum maxNum = max(maxNum,item) } return arr } ```