The problem is here: https://leetcode.com/problems/bitwise-and-of-numbers-range/ .
I simply wrote a silly version and failed as expected,
it just did exactly as this problem described.
class Solution(object):
def rangeBitwiseAnd(self, m, n):
"""
Attention! This is a bad version!
:type m: int
:type n: int
:rtype: int
"""
return ...
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