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

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File Extension

Java files must use the .java extension: 
Main.java
Correct.java
Gen.java
The class name must match the filename. For example, Main.java must contain public class Main.

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Compilation

Java files are compiled using javac with the following command: 
javac -d .qt/ Main.java

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Compilation Options

  • -d .qt/ - Specifies the output directory for compiled .class files
All compiled classes are placed in the .qt/ directory to keep your workspace clean.

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Execution

After compilation, the bytecode is executed with: 
java -cp .qt/ Main

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Execution Options

  • -cp .qt/ - Sets the classpath to the .qt/ directory where compiled classes are located
  • Main - The name of the class containing the main method

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Example Code

Here’s a typical Java solution for competitive programming: 
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] values = new int[n];
        for(int i = 0; i < n; ++i) {
            values[i] = sc.nextInt();
        }
        int best = 0;
        for (int i = 0; i < n; i++) {
            int sum = 0;
            for (int j = i; j < n; j++) {
                sum += values[j];
                best = Math.max(best, sum);
            }
        }
        System.out.println(best);
    }
}

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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.java --correct-file=Correct.java --gen-file=Gen.java

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Stress Testing Mode

Test your solution’s performance: 
quicktest stress --target-file=Main.java --gen-file=Gen.java --tout 2000 --tc 1000

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Checker Mode

For problems with multiple valid answers: 
quicktest check --target-file=Main.java --checker-file=Checker.java --gen-file=Gen.java

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Requirements

You must have the Java Development Kit (JDK) installed on your system to compile and run Java files.
Verify your installation: 
javac -version
java -version

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Naming Conventions

For Quick Test CLI, the main solution file is typically named Main.java with the class public class Main.
Other files follow similar conventions:
  • Correct solution: Correct.java with public class Correct
  • Generator: Gen.java with public class Gen
  • Checker: Checker.java with public class Checker

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Common Imports

For competitive programming in Java, you typically need: 
import java.util.*;
import java.io.*;
For faster I/O in competitive programming, consider using BufferedReader instead of Scanner for large inputs.

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Platform Support

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

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