Question

201. Bitwise AND of Numbers Range

中文文档

Description

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

 

Constraints:

• 0 <= left <= right <= 231 - 1

Solutions

Solution 1

class Solution:
  def rangeBitwiseAnd(self, left: int, right: int) -> int:
    while left < right:
      right &= right - 1
    return right

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

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

func rangeBitwiseAnd(left int, right int) int {
  for left < right {
    right &= (right - 1)
  }
  return right
}

/**
 * @param {number} left
 * @param {number} right
 * @return {number}
 */
var rangeBitwiseAnd = function (left, right) {
  while (left < right) {
    right &= right - 1;
  }
  return right;
};

public class Solution {
  public int RangeBitwiseAnd(int left, int right) {
    while (left < right) {
      right &= (right - 1);
    }
    return right;
  }
}