Code editor validation rules

Restrictive rules that are applied to all question types.

Restriction	Description	Why
Proxy environment variables are not allowed.	Environment variables such as `http_proxy` or `https_proxy` are not allowed.	To prevent user-submitted code from routing network requests through external network paths.

Restrictive rules that are applied to particular question types.

Restriction	Question type	Description	Why
System command execution is not allowed.	Programming, Approximate, Golf	Language features that execute arbitrary system commands are not allowed. Note: In languages like Ruby, commands such as `system()` or `system ()` are filtered out.	To prevent compromising the execution environment or introducing security vulnerabilities.
Use of the `package` keyword is not allowed.	Programming, Approximate, Golf	The `package` keyword is not allowed in the Java submissions. Note: This restriction applies even if the keyword is used inside comments.	To compile and evaluate the candidate submission in a controlled workspace.
Multiple top-level `SELECT` statements are not allowed.	SQL	Only one top-level `SELECT` statement can be used in SQL submission. Note: Only subqueries containing `SELECT` statements are supported within the main query.	To ensure that each SQL submission produces a single result set in our evaluation environment, which is necessary for accurate automated checking.

Restriction

Question type

Description

Why

System command execution is not allowed.

Programming, Approximate, Golf

Language features that execute arbitrary system commands are not allowed.

Note: In languages like Ruby, commands such as system() or system () are filtered out.

To prevent compromising the execution environment or introducing security vulnerabilities.

Use of the package keyword is not allowed.

Programming, Approximate, Golf

The package keyword is not allowed in the Java submissions.

Note: This restriction applies even if the keyword is used inside comments.

To compile and evaluate the candidate submission in a controlled workspace.

Multiple top-level SELECT statements are not allowed.

SQL

Only one top-level SELECT statement can be used in SQL submission.

Note: Only subqueries containing SELECT statements are supported within the main query.

To ensure that each SQL submission produces a single result set in our evaluation environment, which is necessary for accurate automated checking.

HackerEarth has introduced validation rules in the code execution environment.