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.
class Solution {
public:
int rangeBitwiseAnd(int m, int n)
{
int temp = m ^ n;
int i = 0;
while(temp >> i) {
i++;
}
return ((m>>i)<<i);
}
};