diff --git a/data/category-olympiad-in-informatics b/data/category-olympiad-in-informatics
index afd576c6..2f9cc411 100644
--- a/data/category-olympiad-in-informatics
+++ b/data/category-olympiad-in-informatics
@@ -7,6 +7,7 @@ lingkou.cn
 
 51nod.com
 acwing.com
+adacpp.com
 hihocoder.com
 jisuanke.com
 kidsccshow.com