My Code Jam solutions always shared a lot of code -- all the boilerplate for reading inputs, parsing integers, iterating over test cases, and writing out result

My Code Jam solutions always shared a lot of code -- all the boilerplate for reading inputs, parsing integers, iterating over test cases, and writing out results. Because of that, it seems like Code Jam is an artificially easy test case for this sort of identification -- I'm pretty sure a human could look at my solutions and conclude they were obviously all written by the same person.