g0001_0100.s0050_powx_n.Solution Maven / Gradle / Ivy

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Java Solution for LeetCode algorithm problems, continually updating

There is a newer version: 1.24

package g0001_0100.s0050_powx_n;

// #Medium #Top_Interview_Questions #Math #Recursion

public class Solution {
    public double myPow(double x, int n) {
        long nn = n;
        double res = 1;
        if (n < 0) {
            nn *= -1;
        }
        while (nn > 0) {
            if (nn % 2 == 1) {
                nn--;
                res *= x;
            } else {
                x *= x;
                nn /= 2;
            }
        }
        if (n < 0) {
            return 1.0 / res;
        }
        return res;
    }
}