Update reordered-power-of-2.py

Author: kamyu104

Python/reordered-power-of-2.py

@@ -1,5 +1,5 @@
-# Time:  O((logn)^2)
-# Space: O(logn)
+# Time:  O((logn)^2) = O(1) due to n is a 32-bit number
+# Space: O(logn) = O(1)
 
 # Starting with a positive integer N,
 # we reorder the digits in any order (including the original order)