public void ExistTest()
{
var board = JsonConvert.DeserializeObject <char[][]>("[[\"a\",\"b\"],[\"c\",\"d\"]]");
string word = "abdc";
Assert.IsTrue(leetCode.Exist(board, word));
board = JsonConvert.DeserializeObject <char[][]>("[[\"a\",\"b\"],[\"c\",\"d\"]]");
word = "abdcd";
Assert.IsFalse(leetCode.Exist(board, word));
board = JsonConvert.DeserializeObject <char[][]>("[[\"a\"]]");
word = "a";
Assert.IsTrue(leetCode.Exist(board, word));
board = JsonConvert.DeserializeObject <char[][]>("[[\"C\",\"A\",\"A\"],[\"A\",\"A\",\"A\"],[\"B\",\"C\",\"D\"]]");
word = "AAB";
Assert.IsTrue(leetCode.Exist(board, word));
}
