//Hi all :)) The code generates a 2D board of the specified size (input x input)(one int 2 - 24) consisting of "H" and "I" chars and counts how many "Hi"s are hiding there. Each "H" can take only one "I" in any direction horizontally or vertically, while every "I" can be taken any number of times. Outputs "Hi" for every "hi" in the table (a little homage to my SL inbox hopelessly buried under empty Hi messages) import java.util.Random; import java.util.Scanner; //The class is abstract to show that one can have an abstract class without having any abstract methods there abstract class Program { //the methods are final for optimizing the performance (supposedly :/ ) final static boolean there (char[][] t, char[] h, int i, int j, int nxt) { boolean is; if (nxt == h.length) return true; if ((i<0 || j<0) || (i==t.length || j==t[i].length)) return false; else if (t[i][j] != h[nxt]) return false; is = there(t,h,i-1,j,nxt+1)||there(t,h,i,j-1,nxt+1) ||there(t,h,i+1,j,nxt+1)||there(t,h,i,j+1,nxt+1); return is; } final static void check (char[][] t, char[] h) { int nxt = 0; int counter = 0; for (int i = 0; i < t.length; i++) { for (int j = 0; j < t[i].length; j++) { if (there(t,h,i,j,nxt)==true) ++counter; } } for (int k = 0; k < counter; k++) { System.out.print("Hi"); } System.out.print(" (" +counter+ ")"); } public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); if (n<2 || n>24) System.out.println("Invalid input. Please, make sure to enter a positive integer between 2 and 24"); else { char[] hi = {'H', 'I'}; char[][] table = new char [n][n]; for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) { Random r = new Random(); char rch = (char)(r.nextInt(2)+72); table [i][j] = rch; } } for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) { System.out.print( (j==n-1)?table[i][j]+"\n":table[i][j]+" "); } } System.out.println(); check(table, hi); } } }

many_"hi"s