There's also Project Rosalind: http://rosalind.info/problems/locations/ http://rosalind.info/problems/locations/ The problems are mostly bioinformatics related

There's also Project Rosalind: http://rosalind.info/problems/locations/ http://rosalind.info/problems/locations/ The problems are mostly bioinformatics related, which often boils down to string manipulation/comparison, graph theory