0050. Pow(solutions/x, n)

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

Description

Implement pow(x, n), which calculates x raised to the power n (i.e., xn).

Example 1:

**Input:** x = 2.00000, n = 10
**Output:** 1024.00000

Example 2:

**Input:** x = 2.10000, n = 3
**Output:** 9.26100

Example 3:

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

Constraints:

• -100.0 < x < 100.0

• -231 <= n <= 231-1

• -104 <= xn <= 104

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