// Returns if the word is in the trie.
bool search(string word) {
TrieNode* itr = root;
for (int i = 0; itr != NULL && i < word.length(); ++i) {
itr = itr->locateCh(word[i]);
}
return (itr != NULL && itr->isWordEnd());
}
void searchWords(vector<vector<char>>& board, int i, int j, TrieNode* node, string pre, vector<string>& res) {
if (i < 0 || i >= (int)board.size() || j < 0 || j >= (int)board[0].size())
return;
char c = board[i][j];
TrieNode* cur = node->getTrieNode(c);
if (cur == NULL)
return;
pre += c;
if (cur->isWordEnd()) {
if (find(res.begin(), res.end(), pre) == res.end()) // No dup
res.push_back(pre);
}
board[i][j] = '*'; // mark as visited
searchWords(board, i - 1, j, cur, pre, res);
searchWords(board, i + 1, j, cur, pre, res);
searchWords(board, i, j - 1, cur, pre, res);
searchWords(board, i, j + 1, cur, pre, res);
board[i][j] = c;
}