Squares of a Sorted Array

Given an array of integers A sorted in non-decreasing order, return an array of the squares of each number, also in sorted non-decreasing order.

Example 1:

Input: [-4,-1,0,3,10]
Output: [0,1,9,16,100]

Example 2:

Input: [-7,-3,2,3,11]
Output: [4,9,9,49,121]

Note:

1. 1 <= A.length <= 10000

2. -10000 <= A[i] <= 10000

3. A is sorted in non-decreasing order.

分析

排序平方值

可以直接sort，或者双指针，本题是sort数组，注意这里负数，两边都可能是最大的，所以要倒序塞入，appendleft