Bitwise AND of Numbers Range

Bitwise AND of Numbers Range

Total Accepted: 24968 Total Submissions: 89204 Difficulty: Medium

 

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 d = 0;
        while(m!=n){
            m >>= 1 ;
            n >>= 1 ;
            d++;
        }
        return m<<d;
    }
};

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