977. Squares of a Sorted Array(Easy)

Problem

Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order.

Example 1

Input : nums = [-4,-1,0,3,10]
Ouput : [0,1,9,16,100]
Explaniation : After squaring, the array becomes [16,1,0,9,100]. After sorting, it becomes [0,1,9,16,100].

Example 2

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

Constraints

• 1<= nums.length <= 10^4
• -10^4 <= nums[i] <= 10^4
• nums is sorted in non-decreasing order.

Follow up : Squaring each element and sorting the new arrya is trivial, could you find an O(n) solution using a different approach?

풀이

numpy 라이브러리를 사용해보자.

1. import numpy as np
2. np.power(arrays, n) : arrays의 각 원소를 n승한다.
3. np.sort(arrays) : arrays를 오름차순으로 정렬

코드

import numpy as np
class Solution(object):
    def sortedSquares(self, nums):
        """
        :type nums: List[int]
        :rtype: List[int]
        """
        return np.sort(np.power(nums,2))
        

개선할 점

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numpy 라이브러리에서 제공해주는 메서드에 대해서 좀 더 공부해보자.

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