1.暴力法：

class Solution(object):
    def sortedSquares(self, nums):
        """
        :type nums: List[int]
        :rtype: List[int]
        """
        for i in range(len(nums)):
            nums[i]*=nums[i]
        nums.sort()
        return nums

2.双指针

class Solution(object):
    def sortedSquares(self, nums):
        """
        :type nums: List[int]
        :rtype: List[int]
        """
        l=len(nums)
        res=[0]*l
        ini_idx=0
        last_idx=l-1
        for i in range(l-1,-1,-1):
            l_num=nums[last_idx]*nums[last_idx]
            i_num=nums[ini_idx]*nums[ini_idx]
            if l_num>i_num:
                res[i]=l_num
                last_idx-=1
            else:
                res[i]=i_num
                ini_idx+=1
        return res