Word Search

Solution.java

public class Solution {

    public static void main(String args[]){
        System.out.println("Hello world");
        new java.util.Scanner(System.in).nextLine();
    }

    public boolean exist(char[][] board, String word) {
        // Start typing your Java solution below
        // DO NOT write main() function
        for(int i = 0; i < board.length; i++) {
            for(int j = 0; j < board[i].length; j++) {
                if(board[i][j]==word.charAt(0)) {
                    return find(board, i, j, word.substring(1));
                }
            }
        }

    }

    public boolean find(char[][] board, int i, int j, String word) {
        boolean flag = word.length == 1 ? true : false;
        if( i-1 >= 0 && board[i-1][j] == word.charAt(0) ) {
            return flag || find(board, i-1, j, word.substring(1));
        }
        if( i+1 < board.length && board[i+1][j] == word.charAt(0) ) {
            return flag || find(board, i+1, j, word.substring(1));
        }
        if( j+1 < board[i].length && board[i][j+1] == word.charAt(0) ) {
            return flag || find(board, i, j+1, word.substring(1));
        }
        if( j-1 >= 0 && board[i][j-1] == word.charAt(0) ) {
            return flag || find(board, i, j-1, word.substring(1));
        }
        return false;
    }


}