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Co-partner in Train
Tim and Bob are off to the wedding of a close relative. This time they have to travel without their guardians. Rahul got very interested in the arrangement of seats inside the train coach.

The entire coach could be viewed as an arrangement of consecutive blocks of size 8.

Berth Number   	Compartment

 1 -  8               1  
 9 - 16               2  
17 - 24               3  
... and so on
Each of these size-8 blocks are further arranged as:

 1LB,  2MB,  3UB,  4LB,  5MB,  6UB,  7SL,  8SU  
 9LB, 10MB, ...
Here LB denotes lower berth, MB middle berth, and UB upper berth.

The following berths are called Train-Partners:

3UB   |  6UB  
2MB   |  5MB  
1LB   |  4LB  
7SL   |  8SU  
and the pattern is repeated for every set of 8 berths.

Tim and bob are playing this game of finding the co-partner train partner of each berth. Can you write a program to do the same?

The input consists of an integer N, which corresponds to the berth number whose neighbor is to be found out.

The output is to display the berth of the neighbor of the corresponding seat.

Sample test cases
Input 1                                                   Output 1
  1                                                         4LB
  5                                                         2MB

What I have tried:

import java.util.Scanner;

public class Main {
	static final int[] PARTNER_BERTH_NUMBER = { 3, 4, 5, 0, 1, 2, 7, 6 };
	static final String[] PARTNER_BERTH_CODE = { "LB", "MB", "UB", "LB", "MB", "UB", "SU", "SL" };

	public static void main(String[] args) {
		Scanner sc = new Scanner(;

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



	static String solve(int N) {
		int compartment = (N - 1) / 8;
		int berthNumber = (N - 1) % 8;

		return String.format("%d%s", compartment * 8 + PARTNER_BERTH_NUMBER[berthNumber] + 1,
Updated 21-Sep-22 0:42am
CHill60 21-Feb-22 7:20am    
What is wrong with the code that you have tried?
OriginalGriff 21-Feb-22 8:31am    
What does it do that you didn't expect, or not do that you did?
What have you tried to do to find out why?
Are there any error messages, and if so, where and when? What did you do to make them happen?

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with.
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