diff --git a/C01-The-Role-of-Algorithms-in-Computing/problem.md b/C01-The-Role-of-Algorithms-in-Computing/problem.md
index 7e24441e..a399f69b 100644
--- a/C01-The-Role-of-Algorithms-in-Computing/problem.md
+++ b/C01-The-Role-of-Algorithms-in-Computing/problem.md
@@ -15,6 +15,7 @@ Item | 1 second | 1 miniute | 1 hour | 1 day | 1 month | 1 year | 1 century
 ![](http://latex.codecogs.com/gif.latex?\\/{n}!) | 9 | 11 | 12 | 13 | 15 | 16 | 17
 
 
+[code](./exercise_code/problem-1-1.cpp)
 ***
 Follow [@louis1992](https://github.com/gzc) on github to help finish this task.