Update 0023._Merge_K_Sorted_Lists.md

0xkookoo · web-flow · commit 69a2c768fdb1 · 2019-03-20T17:25:05.000+08:00
diff --git a/docs/Leetcode_Solutions/Java/0023._Merge_K_Sorted_Lists.md b/docs/Leetcode_Solutions/Java/0023._Merge_K_Sorted_Lists.md
@@ -1,6 +1,6 @@
 # 23. Merge K Sorted Lists
 
-*<font color=red>难度： Hard</font>*
+**<font color=red>难度： Hard</font>**
 
 ## 刷题内容
 
