The dataset comes from the HackerRank site, 329,937 C# source codes of 22 tasks were collected and all verified by unit tests. During the download process, source codes received only a unique serial number instead of the user name who solved the task and stored inside the 'task_name/origin' folder. After collecting the data, a new database was created, which included cleaned-up versions of the source codes ('task_name/cleaned' folders contains). Finally, a third set of data was extracted from this cleaned-up version, where a delimiter was inserted before and after each elementary expression to support easy processing and analysis processes ('task_name/reduced' folders contains). Inside the 'task_name' folder three csv files, which contain the equality checking result. The compressed folder also contains a vector space (and related files) made from the reduced data set. These four files are directly in the main folder.