Once you have taken the plus subscription, make
sure to sync your Unacademy account with CodeChef. As you scroll down the Unacademy home page,
you will get a "Sync my account with CodeChef" option. Click on the "sync" button and continue
with the instructions. Once you have synced, you can access the problems here.
Make sure that you are logged in to your CodeChef account on this problem page.