add sparse-table in the content

diff --git a/docs/ds/index.md b/docs/ds/index.md
index 64abcd7..4d62436 100644 (file)
--- a/docs/ds/index.md
+++ b/docs/ds/index.md
@@ -75,6 +75,8 @@ author: HeRaNO, Zhoier
 
 -   [x] 单调队列
 
+-   [x] ST 表
+
 -   [x] 树状数组
 
 -   [x] 线段树