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:
class Solution:
def rangeBitwiseAnd(self, left: int, right: int) -> int:
if left == 0 or right == 0:
return 0
a = "{:b}".format(left)
b = "{:b}".format(right)
if len(a) != len(b):
return 0
res = 1 << len(a) - 1
return res + self.rangeBitwiseAnd(left - res, right - res)
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