package main

func myPow(x float64, n int) float64 {
	if n < 0 {
		n = -n
		x = 1 / x
	}
	res := 1.0
	for base := x; n > 0; base, n = base*base, n>>1 {
		if n&1 == 1 {
			res *= base
		}
	}
	return res
}

/* func main() {
	fmt.Println(myPow(2.0, -10))
} */