tcframe is a C++ framework for generating test cases of competitive programming problems. This framework helps problem writers prepare test cases in a structured manner and ensures that the generated test cases are valid according to the specified constraints.

Example high-level usage:

  1. Specify input/output variables.

    int A, B;
    int sum;
  2. Specify input/output formats, using a rich set of format macros.

    void InputFormat() {
        LINE(A, B); // A line containing space-separated A and B
    void OutputFormat() {
  3. Specify the grading configuration.

    void GradingConfig() {
  4. Specify the constraints. Subtasks are supported.

    void Constraints() {
        CONS(1 <= A && A <= 1000);
        CONS(1 <= B && B <= 1000);
  5. Specify the sample test cases.

    void SampleTestCase1() {
            "2 8"
    void SampleTestCase2() {
            "42 100"
  6. Specify the official test cases. Simple random number generator is available.

    void TestCases() {
        CASE(A = 1, B = 1);
        CASE(A = 77, B = 99);
        CASE(A = rnd.nextInt(1, 1000), B = rnd.nextInt(1, 1000));
  7. Write and compile the official solution to this problem, using any programming language you wish. Of course, it is the infamous A+B problem.

    #include <iostream>
    using namespace std;
    int main() {
        int A, B;
        cin >> A >> B;
        cout << (A + B) << endl;
  8. Run the generator. Actual test cases (.in and .out files) will be generated. Profit!

  9. If you ever specified an invalid test case, such as CASE(A = 0, B = 1), you will get a nice error message:

    sum_4: FAILED
      Description: A = 0, B = 1
      * Does not satisfy constraints, on:
        - 1 <= A && A <= 1000


tcframe supports:

  • Batch and interactive problems.
  • ICPC-style problems and IOI-style problems with subtasks and points.
  • Multiple test cases per file.
  • Local grading against the generated test cases, with time and memory limits.
  • Simple random number generation helper.


tcframe requires:

  • Linux/OS X. Windows is not supported.
  • GCC ≥ 4.8. tcframe relies heavily on C++11 features.


Why do we need test case generators?

  • Writing test cases manually is error-prone and time-consuming.
  • To enable distributing the test cases as a single, small generator file. No need to send 20 MB of over email anymore.
  • During problem development, constraints often change. Using a generator, we can easily amend the constraints and rerun the generator when needed.

Why do we need a framework for that?

  • Not everyone knows how to write a good test cases generator.
  • To avoid writing repetitive and boring tasks. For example: creating test case files with correct suffixes (, foo_1.out), running the official solution against the test case input files, etc.
  • To have a consistent format for generators, so that problem writers in a contest can better collaborate in writing test case generators.


tcframe is based on a paper submitted to IOI conference in 2015: Introducing tcframe: A Simple and Robust Test Cases Generation Framework, written by Ashar Fuadi.

tcframe was mainly inspired from testlib, written by Mike Mirzayanov et al.


tcframe is released under MIT license.

Source code can be found on GitHub.