201. Bitwise AND of Numbers Range

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

For example, given the range [5, 7], you should return 4.

 

public class Solution {  public int rangeBitwiseAnd(int m, int n) {    if (m == 0)      return 0;    int powerOf2 = 1;    while (m != n) { //if m!=n, current bit result is 0.      m >>= 1;      n >>= 1;      powerOf2 <<= 1;    }    return m * powerOf2;  }}