Bitwise AND of Number Range

Given two integers left and right that represent the range [left, right], return the bitwise AND of all numbers in this range, inclusive.

Example 1:

Input: left = 5, right = 7
Output: 4

Example 2:

Input: left = 0, right = 0
Output: 0

Example 3:

Input: left = 1, right = 2147483647
Output: 0

Solution

class Solution:
    def rangeBitwiseAnd(self, left: int, right: int) -> int:
        n = right - left
        x = 0
        for b in range(31, -1, -1):
            if (1 << b) < n:
                break
            if (1 << b) & left & right:
                x += 1 << b
        return x