GlassStacking.java

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

/**
 * github: albaad
 **/
class GlassStacking {

	static Integer[] nbrglasses = { 1, 3, 6, 10, 15, 21, 28 };

	public static String[] singleGlass(int offset) {
		String[] glass = new String[4];
		for (int i = 0; i < 4; i++) {
			glass[i] = glassLine(i, offset);
		}
		return glass;
	}

	public static String glassLine(int i, int offset) {
		String line = offset(offset);
		switch (i) {
		case 0:
			line += " *** ";
			break;
		case 1:
		case 2:
			line += " * * ";
			break;
		case 3:
			line += "*****";
			break;
		default:
			break;
		}
		return line;
	}

	// n glasses with offset on this level
	public static String[] multiGlass(int offset, int n) {
		String[] glasses = new String[4];
		for (int i = 0; i < 4; i++) {
			glasses[i] = glassLine(i, offset);
			for (int j = 1; j < n; j++) {
				glasses[i] += " " + glassLine(i, 0);
			}
			glasses[i] += offset(offset);
		}
		return glasses;
	}

	public static String offset(int n) {
		String off = "";
		for (int i = 1; i <= n; i++) {
			off += " ";
		}
		return off;
	}

	public static int determineGlasses(int N) {
		if (N <= 0 || N >= 30) {
			return -1;
		}
		while (Arrays.asList(nbrglasses).indexOf(N) == -1) {
			N = N - 1;
		}
		return N;
	}

	// level starts from the ground = 0
	public static int determineOffset(int level, int nbrlevels) {
		int offset = 3 * level;
		return offset;
	}

	public static int determineLevels(int N) {
		return Arrays.asList(nbrglasses).indexOf(N) + 1;
	}

	public static void printGlass(String[] glass) {
		for (int i = 0; i < glass.length; i++) {
			System.out.println(glass[i]);
		}
	}

	public static void glassStacking(int N) {
		// Determine number of glasses of the pyramid
		N = determineGlasses(N);
		// Determine number of levels
		int levels = determineLevels(N);
		// Loop the levels and create each row
		for (int i = 0; i < levels; i++) {
			String[] glass = multiGlass(determineOffset(levels - i - 1, levels), i + 1);
			printGlass(glass);
		}
	}

	public static void main(String args[]) {
		Scanner in = new Scanner(System.in);
		int N = in.nextInt();
		glassStacking(N);
	}
}