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// https://leetcode.com/problems/powx-n

// T: O(log(n))

// S: O(1)

public class Powxn {

public double myPow(double x, int n) {

if (n >= 0) return power(x, n);

return 1 / power(x, -n);

}

private double power(double x, int n) {

if (n == 0) return 1;

if (n == 1) return x;

double half = power(x, n / 2);

return half * half * (n % 2 == 0 ? 1 : x);

}

}