实现 pow(x, n) ,即计算 x 的 n 次幂函数(即,xn)。
示例 1:
输入:x = 2.00000, n = 10
输出:1024.00000
示例 2:
输入:x = 2.10000, n = 3
输出:9.26100
示例 3:
输入:x = 2.00000, n = -2
输出:0.25000
解释:2-2 = 1/2 2 = 1/4 = 0.25
提示:
- -100.0 < x < 100.0
- -231 <= n <= 231-1
- -104 <= xn <= 104
class Solution {
public:
double quickMul(double x, long long N) {
if (N == 0) {
return 1.0;
}
double y = quickMul(x, N / 2);
return N % 2 == 0 ? y * y : y * y * x;
}
double myPow(double x, int n) {
long long N = n;
return N >= 0 ? quickMul(x, N) : 1.0 / quickMul(x, -N);
}
};