LeetCode 0201 - Bitwise AND of Numbers Range

Bitwise AND of Numbers Range

Desicription

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

Solution

class Solution {
public:
    int rangeBitwiseAnd(int m, int n) {
        return n>m?(rangeBitwiseAnd(m>>1, n>>1) << 1):n;
    }
};