I think that there is a mistake at the beginning of the main function in the third comment.
I think that window size is a correct terminology for this problem.I have checked these slides and it contains the same terminology.Best wishes,
I am the contest organizer
window size is actually not a good term here.usually you try to find approximative matches, so you select a small window for perfect matches and a large threshold for the minimum matching length.
here it's a perfect match we are trying to find.so the minimum size and window can be the same.