I'll create a Next.js application with Google authentication, Codeforces contest listing, and scheduling functionality. Let's start by building this step by step.

This application provides a complete Codeforces contest scheduler with Google authentication. Here's what I've implemented:

1. Authentication:

   • Google OAuth integration with access to Google Calendar API
   • Login page with Google Sign-In only
   • Protected routes that redirect to login if not authenticated

2. Home Page (Contest List):

   • Lists Codeforces contests with pagination (infinite scroll)
   • Filter contests by division (1, 2, 3, 4, or other)
   • Schedule button for each contest

3. Profile Page:

   • Displays user information from Google OAuth (name, email, profile picture)

4. Upcoming Events Page:

   • Shows all scheduled Codeforces contests
   • Option to remove contests from calendar

5. Scheduling Functionality:

   • Dialog to confirm scheduling a contest
   • Integration with Google Calendar API to create events
   • Stores scheduled contests for the user

To use this application, you'll need to:

1. Set up Google OAuth credentials and add them as environment variables:

   • GOOGLE_CLIENT_ID
   • GOOGLE_CLIENT_SECRET
2. Make sure to request the necessary scopes for Google Calendar access during authentication.

The application uses Next.js App Router with server components for the page structure and client components for interactive elements. The UI is built with shadcn/ui components and styled with Tailwind CSS.

Please make sure to add the following environment variables to your project:

I see you're trying to add shadcn components from a v0.dev URL, but you're encountering an error because the block at that URL is no longer available or accessible. The screenshot shows a "Block Not Found" error page.

Instead of trying to add components from a URL that doesn't exist, let's set up shadcn/ui properly in your project. Here's how to do it:

1. First, initialize shadcn/ui in your project:

2. Follow the prompts to configure your preferences (you selected Neutral as your base color).
3. Then add the components you need individually:

This will properly install all the components needed for the Codeforces scheduler application we created. The components will be added to your project's components/ui directory, and you can import them as shown in the code.

If you're starting from scratch, you can also add the components as you need them while building the application.