[Swift Weekly Contest 120]LeetCode977. 有序数组的平方 | 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.

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给定一个按非递减顺序排序的整数数组 A，返回每个数字的平方组成的新数组，要求也按非递减顺序排序。 

示例 1：

输入：[-4,-1,0,3,10]
输出：[0,1,9,16,100]

示例 2：

输入：[-7,-3,2,3,11]
输出：[4,9,9,49,121] 

提示：

1. 1 <= A.length <= 10000
2. -10000 <= A[i] <= 10000
3. A 已按非递减顺序排序。

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400ms

 1 class Solution {
 2     func sortedSquares(_ A: [Int]) -> [Int] {
 3         var A = A
 4         for i in 0..<A.count
 5         {
 6             A[i] = A[i] * A[i]
 7         }
 8         return A.sorted(by:<)
 9     }
10 }