Grokking the System Design Interview, Volume II
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Code Judging System: System Definition

Step 1: System Definition

You submit a solution on a site like LeetCode. A few seconds later a verdict appears: Accepted, or Wrong Answer on test twelve. In this chapter, we design the backend behind that verdict.

The job is easy to state. A user writes code and submits it. The system runs that code against test cases the user never sees. It does that inside a secure, isolated environment the code cannot escape. Then it returns a verdict, fast.

Before we draw anything, we name the four things the system stores. The diagram shows them and how they connect.

  • **Problem

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