Hackerrank , 30 Days of Code Challenges ( Day 28 & 29 Solution)

Day 28: RegEx, Patterns, and Intro to Databases  :

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
        for(int a0 = 0; a0 < N; a0++){
            String firstName = in.next();
            String emailID = in.next();
        }
    }
}

Day 29: Bitwise AND  :

import java.util.Scanner;
public class Solution {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int T = sc.nextInt();
        for (int tc = 0; tc < T; tc++) {
            int N = sc.nextInt();
            int K = sc.nextInt();

            System.out.println(solve(N, K));
        }

        sc.close();
    }

    static int solve(int N, int K) {
        int result = 0;
        for (int A = 1; A <= N; A++) {
            for (int B = A + 1; B <= N; B++) {
                int current = A & B;
                if (current > result && current < K) {
                    result = current;
                }
            }
        }
        return result;
    }
}