0050-powx-n.java

class Solution {
    public double myPow(double x, int n) {
        if(n==0) return 1;
        if(n==1 || x==1 || x==0) return x;
        if(n<0) return (1/x) * myPow(1/x,-(n+1));
        
        return n%2==0 ? myPow(x*x, n/2) : x * myPow(x*x, n/2);
    }
}