block-decomposition

This project is a Rust port of Cryolite's C++ implementation of the algorithms for decomposing a given hand into blocks (winning form).

Original article (Japanese): 与えられた手牌をブロック（和了形）に分解するアルゴリズムについて（C++ 実装） #麻雀 - Qiita

Overview

This repository provides a standalone application for demonstrating mahjong hand decomposition algorithms.

Build and Run

Requires Rust 1.90+ and Cargo.

block-decomposition$ cargo run

Example Output

number of single color hands: 1723
max number of decomposition patterns: 4

map0 == map1
map0 == map2
map0 == map3

These results confirm that multiple algorithmic approaches produce equivalent decompositions.

License

This Rust port is licensed under the MIT No Attribution license.

The original algorithms and C++ implementation were described by Cryolite in the article linked above.