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201. Bitwise AND of Numbers Range

Difficulty Topics

Description

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

 

Constraints:

  • 0 <= left <= right <= 231 - 1

Solution

bitwise-and-of-numbers-range.py
class Solution:
    def rangeBitwiseAnd(self, left: int, right: int) -> int:
        i = 0

        while left != right:
            left >>= 1
            right >>= 1
            i += 1

        return left << i