Training using past problems

The test data is organized into .in and .out files. However, I am unable to open these files directly on my computer. I know how to read data from the in file and can write data to the out file but how do I verify that the data is correct?

Why not?

Hello,
I figured it out. I was using milkmix.in instead of mixmilk.in
It worked, I just read it wrong. Sorry about the post.