feat(1019-squares-of-a-sorted-array): add py3 solution

1019_squares-of-a-sorted-array/python3/solution.py

@@ -0,0 +1,17 @@
+class Solution:
+    def sortedSquares(self, nums: List[int]) -> List[int]:
+        left = 0
+        right = i = len(nums) - 1
+        result = [None] * len(nums)
+        
+        while i >= 0:
+            if abs(nums[left]) > abs(nums[right]):
+                result[i] = nums[left] ** 2
+                left += 1
+            else:
+                result[i] = nums[right] ** 2
+                right -= 1
+            
+            i -= 1
+        
+        return result