Example 1:
Input: board = [
["A","B","C","D"],
["S","A","A","T"],
["A","C","A","E"]
],
word = "CAT"
Output: true
Example 2:
Input: board = [
["A","B","C","D"],
["S","A","A","T"],
["A","C","A","E"]
],
word = "BAT"
Output: false
Given a 2-D grid of characters board and a string word, return true if the word is present in the grid, otherwise return false.
For the word to be present it must be possible to form it with a path in the board with horizontally or vertically neighboring cells. The same cell may not be used more than once in a word.
1 <= board.length, board[i].length <= 51 <= word.length <= 10board and word consists of only lowercase and uppercase English letters.