whatisgithub

What is checker?

lss233/checker — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2021-01-14

C++Audience · developerComplexity · 2/5DormantSetup · moderate

In one sentence

A C++ testing tool for competitive programmers that auto-generates random test cases and compares your solution's output against a reference answer.

Mindmap

mindmap
  root((repo))
    What it does
      Generates random test cases
      Runs your code vs reference
      Compares outputs automatically
    Tech stack
      C++
      testlib.h
    Use cases
      Stress test contest solutions
      Verify floating point answers
      Use custom special judges
    Audience
      Competitive programmers
      Contest participants
    Platforms
      Linux
      Windows

Code map

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filefunction / class

What do people build with it?

USE CASE 1

Stress test a competitive programming solution against a known-correct reference solution automatically.

USE CASE 2

Verify answers that involve floating-point numbers or multiple valid outputs using a special judge.

USE CASE 3

Catch edge-case bugs in a contest solution before submitting it to Codeforces or an ACM competition.

What is it built with?

C++testlib.h

How does it compare?

lss233/checkerachanana/mavsdkalange/llama.cpp
Stars——0
LanguageC++C++C++
Last pushed2021-01-142024-05-20—
MaintenanceDormantDormant—
Setup difficultymoderatemoderatemoderate
Complexity2/54/54/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Configuration is done via a C++ header file, so changing settings requires recompiling the project.

No license information was found in the explanation.

Copy-paste prompts

Prompt 1
Show me how to set up Main.cpp, Std.cpp, and Dmk.cpp so I can stress test my solution with Checker.
Prompt 2
Help me write a custom special judge function for Checker to handle floating-point answers.
Prompt 3
Explain how Checker's random test case generation and comparison loop works.
Prompt 4
Walk me through compiling and running Checker on Windows for a competitive programming contest.

Frequently asked questions

What is checker?

A C++ testing tool for competitive programmers that auto-generates random test cases and compares your solution's output against a reference answer.

What language is checker written in?

Mainly C++. The stack also includes C++, testlib.h.

Is checker actively maintained?

Dormant — no commits in 2+ years (last push 2021-01-14).

What license does checker use?

No license information was found in the explanation.

How hard is checker to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is checker for?

Mainly developer.

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