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-rw-r--r--other/power_of_four.cpp24
1 files changed, 24 insertions, 0 deletions
diff --git a/other/power_of_four.cpp b/other/power_of_four.cpp
new file mode 100644
index 0000000..ecf6de0
--- /dev/null
+++ b/other/power_of_four.cpp
@@ -0,0 +1,24 @@
+#include "leetcode.h"
+
+class Solution {
+public:
+ bool isPowerOfFour(int num) {
+ if (num < 0)
+ return false;
+ int ans = 0, pos = 1, ones = 0;
+ while (num) {
+ if (num & 1)
+ ans += 1, ones = pos;
+ num >>= 1, pos += 1;
+ }
+ return ans == 1 && ones & 1;
+ }
+};
+
+int main() {
+ Solution obj;
+ if (obj.isPowerOfFour(16))
+ cout << "true";
+ else
+ cout << "false";
+}