201. Bitwise AND of Numbers Range

Posted 2020-11-16 wentiliangkaihua

Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive.

Example 1:

Input: [5,7]
Output: 4

Example 2:

Input: [0,1]
Output: 0

class Solution {
    public int rangeBitwiseAnd(int m, int n) {
        while (n > m) {
            n &= n - 1;
        }
        return m & n;
    }
}