Importing an exercise from the exercise repository is pretty easy. First, go to the repository search page, https://cloudcoder.org/repo/search. Enter some search tags. Each exercise is automatically tagged with the source language ("c" for C/C++, "java" for Java, etc.) You can try additional search tags (such as "loop" for loop exercises.)

When you find an exercise you want to import, copy its hash code to the clipboard. In CloudCoder, select a course and click the Problems button in the upper left. Click the Import button. Enter the hash code in the "Exercise hash" box. Then, click the Import exercise! button. Note that you will need to change the visibility of the exercise to true before students will be able to see it.