0. You have a write access to a problem, some other users also have write access to the problem 1. You want to add it to the contest, you go to the contest, press "Add problems?", find the problem, choose it 2. Then the access table opens (if some contest developers don't have an access to the problem) 3. You change "Choose for all contest developers:" to "READ" 4. The write access is taken away from those who had the write access before, and the read access is given to them
