Create Power-of-Four.cpp

Author: aelric1

LeetCode/Power-of-Four.cpp

@@ -0,0 +1,10 @@
+class Solution {
+public:
+    bool isPowerOfFour(int n) {
+        if (n <= 0) return false;
+        while (n % 4 == 0) {
+            n /= 4;
+        }
+        return n == 1;
+    }
+};