Darts-clone: An Efficient and Compact C++ Double Array Trie Library

Darts-clone: An Efficient and Compact C++ Double Array Trie Library

Darts-clone is a static double array Trie structure library based on C++. It is a clone of Darts (Double-Array Trie System). By optimizing the data structure, it provides more efficient space utilization and fast string lookup capabilities, suitable for applications that require efficient keyword searching.

Core Features

1. Half-Size Elements
Darts-clone uses 32-bit elements, while Darts uses 64-bit elements. This improvement directly reduces the storage space of the dictionary by half, significantly enhancing space efficiency.

2. Utilization of DAWG Structure
Unlike Darts, which uses a basic Trie tree, Darts-clone adopts the Directed Acyclic Word Graph (DAWG). DAWG is a graphical structure generated by merging common subtrees in the Trie. If the key set contains a large number of duplicate values, Darts-clone requires fewer elements than Darts, further optimizing space usage.

3. Maintains High Performance
Despite the space optimization, the search performance of Darts-clone is not compromised. It can still perform string lookups quickly, including exact matches and prefix matches.

Usage Instructions

To use Darts-clone, you first need to install the library. You can follow these steps for installation:

1. Clone the Repository

   git clone https://github.com/s-yata/darts-clone.git
   cd darts-clone

2. Build and Install
   If your development environment supports CMake, you can build and install using the following commands:

   mkdir build && cd build
   cmake ..
   make
   sudo make install

In your code, you can use Darts-clone by including the header file darts.h. Here is a simple example code:

#include "darts_clone.h"
int main() {
    DartsClone::Dict dict;
    dict.insert("hello", "world");
    dict.insert("foo", "bar");
    std::string value;
    if (dict.find("hello", value)) {
        std::cout << "Found 'hello': " << value << std::endl;
    } else {
        std::cout << "'hello' not found." << std::endl;
    }
    return 0;
}

Application Scenarios

Darts-clone is suitable for applications that require efficient keyword searching, such as:

• Word Frequency Statistics: Quickly searching and counting the frequency of word occurrences.
• Search Engine Vocabulary Index: Rapid retrieval of vocabulary and its related information.
• Pinyin to Chinese Character Conversion Table: Efficiently performing string matching and conversion.

Advantages and Summary

The main advantages of Darts-clone lie in its efficient space utilization and fast lookup performance. By using 32-bit elements and the DAWG structure, it significantly reduces storage space while maintaining high performance. This makes Darts-clone an ideal choice for handling large static data sets.

In summary, Darts-clone is a powerful and efficient C++ library suitable for various applications that require fast string searching. If you are looking for an efficient and compact dictionary structure, Darts-clone is definitely worth a try.