mplement pow(x, n), which calculates x raised to the power n (xⁿ).

Example 1:

Input: 2.00000, 10
Output: 1024.00000

Example 2:

Input: 2.10000, 3
Output: 9.26100

Example 3:

Input: 2.00000, -2
Output: 0.25000
Explanation: 2-2 = 1/22 = 1/4 = 0.25

Note:

• -100.0 < x < 100.0
• n is a 32-bit signed integer, within the range [−2³¹, 2³¹ − 1]

class Solution:
    def myPow(self, x: float, n: int) -> float:
        if n == 0:
            return 1
        
        if n < 0:
            return 1 / self.myPow(x, -n)
        
        if n % 2:
            return x * self.myPow(x, n-1)
        
        return self.myPow(x*x, n/2)