A paper shows that coding style is present in source code and can be used to de-anonymize programmers. We use a dataset consisting of source code samples of 600 programmers which are available on the website of the annual programming competition Google Code Jam (GCJ) This dataset contains information such as how many rounds the contestants were able to advance, inferring their programming skill, while all contestants were implementing algorithmic solutions to the same programming tasks. This finding is of concern for privacy-aware programmers who would like to remain anonymous.”]