// Returns if the word is in the trie.
bool search(string word) {
TrieNode * cur = root;
for (int i = 0; i < word.length(); i++)
{
cur = cur->next_node(word[i]);
if (cur == NULL)
return false;
}
return cur->isend;
}
// Returns if there is any word in the trie
// that starts with the given prefix.
bool startsWith(string prefix) {
TrieNode * cur = root;
for (int i = 0; i < prefix.length(); i++)
{
cur = cur->next_node(prefix[i]);
if (cur == NULL)
return false;
}
return true;
}
// Inserts a word into the trie.
void insert(string word) {
TrieNode * cur = root;
for (int i = 0; i < word.length(); i++)
{
TrieNode * post = cur->next_node(word[i]);
if (post != NULL)
cur = post;
else
{
TrieNode* new_node = new TrieNode(word[i]);
cur->child.push_back(new_node);
cur = new_node;
}
}
cur->isend = true;
}