Create check-if-number-is-a-sum-of-powers-of-three.py

Author: kamyu104

Python/check-if-number-is-a-sum-of-powers-of-three.py

@@ -0,0 +1,14 @@
+# Time:  O(logn)
+# Space: O(1)
+
+class Solution(object):
+    def checkPowersOfThree(self, n):
+        """
+        :type n: int
+        :rtype: bool
+        """
+        while n > 0:
+            if n%3 == 2:
+                return False
+            n //= 3
+        return True