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Create 08_trie.cpp #153

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Create 08_trie.cpp #153

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36 changes: 36 additions & 0 deletions 10 October LeetCode Challenge 2021/08_trie.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,36 @@
class Trie {
public:
Trie* children[26] = {};
bool isWord = false;

void insert(string word) {
Trie* cur = this;
for (char c : word) {
c -= 'a';
if (cur->children[c] == nullptr)
cur->children[c] = new Trie();
cur = cur->children[c];
}
cur->isWord = true;
}

bool search(string word) {
Trie* cur = this;
for (char c : word) {
c -= 'a';
if (cur->children[c] == nullptr) return false;
cur = cur->children[c];
}
return cur->isWord;
}

bool startsWith(string prefix) {
Trie* cur = this;
for (char c : prefix) {
c -= 'a';
if (cur->children[c] == nullptr) return false;
cur = cur->children[c];
}
return true;
}
};