Leetcode 201. Bitwise AND of Numbers Range

bitwise operation

Medium

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Given two integers left and right that represent the range [left, right], return the bitwise AND of all numbers in this range, inclusive.

Example 1:

Input: left = 5, right = 7
Output: 4

Example 2:

Input: left = 0, right = 0
Output: 0

Example 3:

Input: left = 1, right = 2147483647
Output: 0

solution:

class Solution {
public:
    int rangeBitwiseAnd(int left, int right) {
        while (right > left) {
            right = right & (right - 1);
        }
        return left & right;
    }
};