I think plagiarism checker should be enabled into the practice area also.
If people not able to solve the problem they just go to all submission and just copy the AC solution and make their own submission.
if you go through the submission of Problem DOWNLOAD you may easily realize that almost all solutions are same. People don't even change a single line. They did just copy paste.
@vijju123, @horsbug98, @admin have a look into this issue and please develop the plagiarism checker for the practice area.
Hope for positive response.