add solution

Author: hanksudo

231-power-of-two.py

@@ -0,0 +1,6 @@
+# https://leetcode.com/problems/power-of-two/
+# https://leetcode.com/problems/power-of-two/discuss/63966/4-different-ways-to-solve-Iterative-Recursive-Bit-operation-Math
+
+class Solution:
+    def isPowerOfTwo(self, n: int) -> bool:
+        return n > 0 and (n & (n - 1)) == 0