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-rw-r--r--pow_xn.cpp20
1 files changed, 20 insertions, 0 deletions
diff --git a/pow_xn.cpp b/pow_xn.cpp
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--- /dev/null
+++ b/pow_xn.cpp
@@ -0,0 +1,20 @@
+#include "leetcode.h"
+
+class Solution {
+public:
+ double myPow(double x, int n) {
+ if (n < 0)
+ x = 1 / x;
+ long num = labs(n);
+ double pow = 1;
+ while (num) {
+ if (num & 1)
+ pow *= x;
+ x *= x;
+ num >>= 1;
+ }
+ return pow;
+ }
+};
+
+int main() {}