201. Bitwise AND of Numbers Range

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# 題目敘述

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

# 解題思路

# Solution

class Solution {

    public int rangeBitwiseAnd(int left, int right) {

        int count = 0;

        while (left < right) {

            left >>= 1;

            right >>= 1;

            count++;

        }

        return left << count;

    }

}