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Quick Test CLI provides full support for C++ with automatic compilation and execution of your competitive programming solutions.

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File Extension

C++ files must use the .cpp extension: 
main.cpp
correct.cpp
gen.cpp

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Compilation

C++ files are compiled using g++ with the following command: 
g++ -std=c++17 -Wall -DONLINE_JUDGE=1 -o .qt/main main.cpp

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Compilation Flags

  • -std=c++17 - Uses C++17 standard
  • -Wall - Enables all compiler warnings
  • -DONLINE_JUDGE=1 - Defines the ONLINE_JUDGE macro for conditional compilation
  • -o .qt/main - Outputs the compiled binary to .qt/main
The ONLINE_JUDGE macro allows you to write code that behaves differently in local testing vs online judges.

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Execution

After compilation, the binary is executed with: 
./.qt/main

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Example Code

Here’s a typical C++ solution for competitive programming: 
#include <bits/stdc++.h>
using namespace std;

int main() {
    // Maximum Subarray Problem

    int n; cin >> n;
    vector<int> values(n);
    for(int &a: values)
        cin >> a;
    
    int best = 0, sum = 0;
    
    for (int i = 0; i < n; i++) {
        sum = max(values[i], sum + values[i]);
        best = max(best, sum);
    }
    cout << best << "\n";
    
    return 0;
}

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Usage with Quick Test

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Compare Mode (cmp)

Compare your solution against a brute-force correct solution: 
quicktest cmp --target-file=main.cpp --correct-file=correct.cpp --gen-file=gen.cpp

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Stress Testing Mode

Test your solution’s performance: 
quicktest stress --target-file=main.cpp --gen-file=gen.cpp --tout 1000 --tc 1000

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Checker Mode

For problems with multiple valid answers: 
quicktest check --target-file=main.cpp --checker-file=checker.cpp --gen-file=gen.cpp

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Requirements

You must have g++ installed on your system to compile C++ files.
Verify your installation: 
g++ --version

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Common Headers

The #include <bits/stdc++.h> header is a non-standard GCC header that includes most C++ standard library headers. While convenient for competitive programming, it’s not recommended for production code.
For faster compilation during practice, you can modify the compilation command in ~/.quicktest/languages.config.json to include precompiled headers or change optimization flags.

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Platform Support

  • Linux: Full support
  • Windows: Full support
  • macOS: Full support

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