LeetCode 977. Squares of a Sorted Array

Description

https://leetcode.com/problems/squares-of-a-sorted-array/

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]
Output: [0,1,9,16,100]
Explanation: 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 <= 104
  • -104 <= nums[i] <= 104
  • nums is sorted in non-decreasing order.

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

Explanation

Find squares of nums and then sorted the squared nums.

Python Solution

class Solution:
    def sortedSquares(self, nums: List[int]) -> List[int]:
        
        squared_nums = [num**2 for num in nums]
        
        
        return list(sorted(squared_nums))
  • Time Complexity: O(Nlog(N))
  • Space Complexity: O(N)

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