feat(dynamic.md): 添加了一些习题

diff --git a/docs/dp/dynamic.md b/docs/dp/dynamic.md
index 1da736c..f708acc 100644 (file)
--- a/docs/dp/dynamic.md
+++ b/docs/dp/dynamic.md
@@ -243,3 +243,10 @@ $$
       return 0;
     }
     ```
+## 习题
+
+[SPOJ GSS3 - Can you answer these queries III](https://www.spoj.com/problems/GSS3/)
+
+[「NOIP2018」保卫王国](https://loj.ac/p/2955)
+
+[「SDOI2017」切树游戏](https://loj.ac/p/2269)
\ No newline at end of file