public List <string> FindWords(char[][] board, string[] words)
{
//构建字典树
WordTrie myTrie = new WordTrie();
TrieNode root = myTrie.root;
foreach (string word in words)
{
myTrie.Insert(word);
}
//使用set防止重复
HashSet <string> result = new HashSet <string>();
int m = board.Length;
int n = board[0].Length;
bool[,] visited = new bool[m, n];
//遍历整个二维数组
for (int i = 0; i < board.Length; i++)
{
for (int j = 0; j < board[0].Length; j++)
{
Find(board, visited, i, j, m, n, result, root);
}
}
return(new List <String>(result));
}
public void TrieLowerTest()
{
var trie = new WordTrie();
trie.Insert("Ab");
Assert.True(trie.Search("ab"));
}
public void SearchTest()
{
var trie = new WordTrie();
trie.Insert("ab");
trie.Insert("abc");
trie.Insert("abd");
trie.Insert("abcd");
Assert.True(trie.Search("ab"));
Assert.True(trie.Search("abc"));
Assert.True(trie.Search("abd"));
Assert.True(trie.Search("abcd"));
Assert.False(trie.Search("z"));
Assert.False(trie.Search("zb"));
Assert.False(trie.Search("bc"));
Assert.False(trie.Search("acb"));
Assert.False(trie.Search("?"));
}
public void ThrowsWhenUsingReservedCharacters()
{
Assert.Throws <System.Exception>(() => {
var trie = new WordTrie();
trie.Insert(trie.StartChar.ToString());
});
Assert.Throws <System.Exception>(() => {
var trie = new WordTrie();
trie.Insert(trie.EndChar.ToString());
});
}
public void TrieDeleteTest()
{
var trie = new WordTrie();
trie.Insert("ab");
trie.Insert("abc");
trie.Insert("abd");
trie.Delete("ab");
Assert.False(trie.Search("ab"));
Assert.True(trie.Search("abc"));
Assert.True(trie.Search("abd"));
trie.Delete("abc");
Assert.False(trie.Search("ab"));
Assert.False(trie.Search("abc"));
Assert.True(trie.Search("abd"));
trie.Delete("abd");
Assert.False(trie.Search("ab"));
Assert.False(trie.Search("abc"));
Assert.False(trie.Search("abd"));
}
public void TrieInsertTest()
{
var trie = new WordTrie();
trie.Insert("ab");
Assert.Equal(trie.StartChar, trie.Root.Character);
var aNode = new Node('a', trie.EndChar);
var bNode = new Node('b', trie.EndChar);
var lastNode = new Node(trie.EndChar, trie.EndChar);
Assert.True(trie.Root.Childs.TryGetValue(aNode, out var a));
Assert.Equal('a', a.Character);
Assert.True(a.Childs.TryGetValue(bNode, out var b));
Assert.Equal('b', b.Character);
Assert.True(b.Childs.TryGetValue(lastNode, out var last));
Assert.Equal('=', last.Character);
}