style: format markdown files with remark-lint

diff --git a/docs/graph/tree-hash.md b/docs/graph/tree-hash.md
index 3815e2c..3b3e089 100644 (file)
--- a/docs/graph/tree-hash.md
+++ b/docs/graph/tree-hash.md
@@ -413,6 +413,7 @@ $$
     using MyIO::gi;
     using sieve::prime;
     int ping[maxn], pingv[maxn];
+    ```
 
     int n, ans, siz[maxn];
     vector<int> edge[maxn];