Improve code with precomputing

### Link to the coursework

https://github.com/CodeYourFuture/Module-Complexity/tree/main/Sprint-2/improve_with_precomputing

### Why are we doing this?

Getting practical experience improving existing code to make it more efficient.

### Maximum time in hours

5

### How to submit

Fork the repo to your own GitHub account
Make regular small commits with clear messages
When you are ready, open a Pull Request to the CYF repo
Make sure you fill in the PR template provided

先開啟 Sprint-2/improve_with_precomputing/ 中連結的課程目錄，並閱讀練習說明與現有程式碼。如果有提供練習檢查，請執行它們；完成表示該目錄中的程式碼已透過預先計算獲得改進，並使用儲存庫所述的 pull-request 流程提交。

由索引模型根據 Issue 內容生成。