In my point of view i don't think that's actually a good idea coz Codeforces has hack system, if u can't see the test data, then u probably have to debug it forever :L
Why the test data is invisible now?
In my point of view i don't think that's actually a good idea coz Codeforces has hack system, if u can't see the test data, then u probably have to debug it forever :L