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[LeetCode] Pow(x, n) (二分法)

Implement pow(x, n).

刚开始没想到,后来看remlost的博客才写出来,代码很简练:

class Solution {public:    double pow(double x, int n) {        if(n<0)            return 1/power(x,-n);        else            return power(x,n);    }private:    double power(double x, int n){        if(n==0)            return 1;                    double v = power(x,n/2);        if(n%2==0)            return v*v;        else            return v*v*x;            }};