Day 29: Bitwise AND In Java | 30 Days Of Code | Hackerrank Programming Solutions

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30 Days Of Code Hackerrank

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In this post, you will find the solution for Day 29: Bitwise AND in Java-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.

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Link for the Problem – Day 29: Bitwise AND – Hacker Rank Solution 

Day 29: Bitwise AND – Hacker Rank Solution

Problem:

Objective
Welcome to the last day! Today, we’re discussing bitwise operations. Check out the Tutorial tab for learning materials and an instructional video!

Task
Given set . Find two integers,  and  (where ), from set  such that the value of  is the maximum possible and also less than a given integer, . In this case,  represents the bitwise AND operator.

Function Description
Complete the bitwiseAnd function in the editor below.

bitwiseAnd has the following paramter(s):
– int N: the maximum integer to consider
– int K: the limit of the result, inclusive

Returns
– int: the maximum value of  within the limit.

Input Format

The first line contains an integer, , the number of test cases.
Each of the  subsequent lines defines a test case as  space-separated integers,  and , respectively.

Constraints

Sample Input

STDIN   Function
-----   --------
3       T = 3
5 2     N = 5, K = 2
8 5     N = 8, K = 5
2 2     N = 8, K = 5

Sample Output

1
4
0

Explanation

All possible values of  and  are:

The maximum possible value of  that is also  is , so we print  on a new line.

Day 29: Bitwise AND – Hacker Rank Solution
import java.util.Scanner;

/**
 * @author Techno-RJ
 *
 */
public class Day29BitwiseAND {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int t = in.nextInt();
		for (int a0 = 0; a0 < t; a0++) {
			int n = in.nextInt();
			int k = in.nextInt();
			in.close();
			if (((k - 1) | k) <= n) {
				System.out.println(k - 1);
			} else {
				System.out.println(k - 2);
			}

		}
	}
}

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