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Problem MongoDB Collection

Purpose: The massive, central collection storing all algorithm problem descriptions, boilerplates, and judging configurations. Stored in MongoDB because of the heavily nested schema constraints and varying code snippet configurations.

Fields

  • title (String): Display name.
  • problem_id (String, Unique): Canonical internal ID.
  • problem_slug (String, Unique): URL-friendly string used in the frontend router.
  • difficulty (String): 'Easy', 'Medium', or 'Hard'.
  • topics (Array of String): List of string tags.
  • description (String): Markdown or HTML content describing the problem.
  • examples (Array): Sub-documents containing example_text and images.
  • constraints / follow_ups / hints (Array of String).
  • code_snippets (Object): A dictionary mapping languages (e.g., 'python', 'cpp') to the starter boilerplate code the user sees.
  • problem_type (String): The mode of the problem ('function', 'class', or 'interactive').
  • function_signature / class_signature: Heavily nested schemas defining the strict input parameters and return types expected. Used by the Judge subsystem to automatically generate wrapper code.
  • judging_policy (Object): Instructions for the Judge (e.g., comparator_mode, output_order).
  • solutions (String): Serialized JSON array of AI-generated educational solutions.
  • is_premium (Boolean): Paywall flag.

Note: Includes a text index problem_text_index across title, problem_slug, and topics to power the platform's global search bar.