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

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Link for the ProblemDay 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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