Bitwise AND of Numbers Range

Description

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

Code

class Solution {
    public int rangeBitwiseAnd(int m, int n) {
        int step = 0;
        while(m!=n){
            m >>= 1;
            n >>= 1;
            step ++;
        }
        return m<<step;
    }
}