刷 LeetCode 題庫時，出現如上報錯，代碼沒問題，本地運行也沒問題，可復制到 LeetCode 就報錯。
解決方案：在函數的最后添加一條 return 語句，只要返回的類型對即可！（return 0 也行）。
切記：一定要返回，雖然永遠也用不上。
參考 https://blog.csdn.net/FunnyZilly/article/details/87899960
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