Update REFERENCE.md

Author: kamyu104

REFERENCE.md

@@ -78,7 +78,7 @@
         * [プログラミングコンテストチャレンジブック](https://www.amazon.co.jp/%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0%E3%82%B3%E3%83%B3%E3%83%86%E3%82%B9%E3%83%88%E3%83%81%E3%83%A3%E3%83%AC%E3%83%B3%E3%82%B8%E3%83%96%E3%83%83%E3%82%AF-%E7%AC%AC2%E7%89%88-%EF%BD%9E%E5%95%8F%E9%A1%8C%E8%A7%A3%E6%B1%BA%E3%81%AE%E3%82%A2%E3%83%AB%E3%82%B4%E3%83%AA%E3%82%BA%E3%83%A0%E6%B4%BB%E7%94%A8%E5%8A%9B%E3%81%A8%E3%82%B3%E3%83%BC%E3%83%87%E3%82%A3%E3%83%B3%E3%82%B0%E3%83%86%E3%82%AF%E3%83%8B%E3%83%83%E3%82%AF%E3%82%92%E9%8D%9B%E3%81%88%E3%82%8B%EF%BD%9E-%E7%A7%8B%E8%91%89%E6%8B%93%E5%93%89/dp/4839941068)
         * [Competitive Programming in Python](https://www.amazon.com/Christoph-D%C3%BCrr-ebook/dp/B08K3MS9ML)
         * [Guide to Competitive Programming](https://www.amazon.com/Antti-Laaksonen/dp/3030393569)
-        * [算法竞赛入门经典（第2版）](https://item.jd.com/11469701.html) / [算法竞赛入门经典——训练指南 升级版](https://item.jd.com/13171506.html)
+        * [算法竞赛入门经典 (第2版)](https://item.jd.com/11469701.html) / [算法竞赛入门经典 - 训练指南 升级版](https://item.jd.com/13171506.html)
     * Advanced Reference
         * [The Art of Computer Programming](https://www.amazon.com/dp/0137935102)
 * System Design