Pow(x n) LeetCode – Python Solutions

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LeetCode has a Medium coding Problem in Its’ Algorithm Section “Pow(x n) LeetCode”. Today We are going to solve this problem in Python. LeetCode Link of the Problem is HERE

Question

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

Examples

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

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

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

Solution to Pow(x n) LeetCode

class Solution(object):
    def myPow(self, x, n):
        """
        :type x: float
        :type n: int
        :rtype: float
        """
        pow = 1
        if n < 0:
            n = (-n)
            x = 1/x
        while n:

            # if `n` is odd, multiply the result by `x`
            if n & 1:
                pow *= x

            # divide `n` by 2
            n = n >> 1

            # multiply `x` by itself
            x = x * x

        # return result
        return pow

Success

Runtime: 21 ms, faster than 63.45% of Python online submissions for Pow(x, n).

Memory Usage: 13.3 MB, less than 68.21% of Python online submissions for Pow(x, n).

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