Update splay.md

diff --git a/docs/ds/splay.md b/docs/ds/splay.md
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--- a/docs/ds/splay.md
+++ b/docs/ds/splay.md
@@ -424,7 +424,7 @@ int main() {
 
 ## 练习题
 
-[luogu P4402 \[Cerc2007\]robotic sort 机械排序](https://www.luogu.org/problemnew/show/P4402)
+[luogu P4402 \[Cerc2007\]robotic sort 机械排序](https://www.luogu.org/problemnew/show/P4402)/[bzoj 1552（权限题）](https://www.lydsy.com/JudgeOnline/problem.php?id=1552)
 
 [luogu P3380【模板】二逼平衡树（树套树）](https://www.luogu.org/problemnew/show/P3380)