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Update gray-code.md, add CSP S2 2019 D1T1 as refered problem. (#1853)

Update gray-code.md, add CSP S2 2019 D1T1 as refered problem. 
parents ab4a9bb3 42553f0b
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## 习题

-    [CSP S2 2019 D1T1](https://www.luogu.org/problem/P5657) Difficulty: easy
-    [SGU #249 Matrix](http://codeforces.com/problemsets/acmsguru/problem/99999/249) Difficulty: medium

     **本页面部分内容译自博文 [Код Грея](http://e-maxx.ru/algo/gray_code) 与其英文翻译版 [Gray code](https://cp-algorithms.com/algebra/gray-code.html) 。其中俄文版版权协议为 Public Domain + Leave a Link;英文版版权协议为 CC-BY-SA 4.0。**