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Solution for dictionary:
#include<iostream>
#include <unordered_map>
#include <string>
using namespace std;
class TrieNode {
public:
std::unordered_map<char, TrieNode*> children;
bool is_end_of_word;
TrieNode() : is_end_of_word(false) {}
};
class WordDictionary {
private:
TrieNode* root;
bool searchInNode(const std::string& word, int index, TrieNode* node) {
if (index == word.length()) {
return node->is_end_of_word;
}
char char_at_index = word[index];
if (char_at_index == '.') {
for (auto& child : node->children) {
if (searchInNode(word, index + 1, child.second)) {
return true;
}
}
return false;
} else {
if (node->children.find(char_at_index) != node->children.end()) {
return searchInNode(word, index + 1, node->children[char_at_index]);
} else {
return false;
}
}
}
public:
WordDictionary() {
root = new TrieNode();
}
void addWord(const std::string& word) {
TrieNode* node = root;
for (char c : word) {
if (node->children.find(c) == node->children.end()) {
node->children[c] = new TrieNode();
}
node = node->children[c];
}
node->is_end_of_word = true;
}
bool search(const std::string& word) {
return searchInNode(word, 0, root);
}
~WordDictionary() {
// A function to delete the trie nodes recursively could be added here
// to avoid memory leaks. This is not implemented here for simplicity.
}
};
int main() {
WordDictionary wordDictionary;
wordDictionary.addWord("bad");
wordDictionary.addWord("dad");
wordDictionary.addWord("mad");
cout<< wordDictionary.search("pad")<<endl; // Output: 0 (false)
cout<< wordDictionary.search("bad")<<endl; // Output: 1 (true)
cout<< wordDictionary.search(".ad")<<endl; // Output: 1 (true)
cout<< wordDictionary.search("b..")<<endl; // Output: 1 (true)
return 0;
}
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