code updated

diff --git a/docs/intro/common-tricks.md b/docs/intro/common-tricks.md
index 44d9bd6..a684f4e 100644 (file)
--- a/docs/intro/common-tricks.md
+++ b/docs/intro/common-tricks.md
@@ -42,6 +42,7 @@
 使用namespace能使程序可读性更好，便于调试。
 
 ```cpp
+//NOI 2018 屠龙勇士 40分部分分代码
 #include <iostream>
 #include <algorithm>
 #include <cmath>