We will explain in the following order:

[Important] Why you must follow these instructions
How to install libraries
1. C
2. C++
3. C#
4. Java
5. NodeJS, TypeScript
6. PHP
7. Python
8. Scala
9. Perl
10. Ruby
11. Go
12. Swift
13. Kotlin
14. Rust
FAQ

[Important] Why you must follow these instructions

The execution environment connected from the Web Editor is different from the actual scoring environment.

If you install the library with instructions other than as described below, the library will be installed only in the execution environment to which the Web Editor browser session is connected, and not in the actual scoring environment.

Therefore, the library will not be installed at the time of scoring. In order to install the library in the scoring environment, please be sure to follow the instructions below.

How to install libraries

C

Additional libraries are not supported.

C++

Additional libraries are not supported.

C##

If you want to use external libraries, do the following:

Add dependencies in MainApp.csproj.
You can also update MainApp.csproj file by dotnet add package command.

Example

<ItemGroup>
  <PackageReference Include="RestSharp" Version="106.13.0" />
</ItemGroup>

Java

If you want to use external libraries, do the following:

Add dependencies in pom.xml.

Example

<dependencies>
  <dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.5</version>
  </dependency>
  <dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpcore</artifactId>
    <version>4.4.9</version>
  </dependency>
</dependencies>

NodeJS, TypeScript

If you want to use external libraries, do the following:

Add dependencies in package.json.

Example

"dependencies": {
  "lodash": "4.17.15",
  "underscore.string": "3.3.5"
}

PHP

If you want to use external libraries, do the following:

Add dependencies in composer.json.

Example

"require": {
  "guzzlehttp/guzzle": "6.5.0",
  "nesbot/carbon": "2.35.0"
}

Python

If you want to use external libraries, do the following:

Add dependencies in requirements.txt.

Example

numpy
requests

You can explicitly specify a library version as follows. If an error occurs when installing a library please try changing or not specifying a library version.

numpy==1.21.5
requests==2.12.4

Perl

If you want to use external libraries, do the following:

Add dependencies in cpanfile. Dependencies will be installed by using Carton.

Example

requires 'Plack', '1.0'; # 1.0 or newer
requires 'JSON', '>= 2.00, < 2.80';
 
recommends 'JSON::XS', '2.0';
conflicts 'JSON', '< 1.0';
 
on 'test' => sub {
    requires 'Test::More', '>= 0.96, < 2.0';
    recommends 'Test::TCP', '1.12';
};
 
on 'develop' => sub {
    recommends 'Devel::NYTProf';
};
 
feature 'sqlite', 'SQLite support' => sub {
    recommends 'DBD::SQLite';
};

Ruby

If you want to use external libraries, do the following:

Add dependencies in Gemfile.
You can also use the bundle add command to install libraries.

Example

source 'https://rubygems.org'

# Write the library name and version to the following
gem 'diff-lcs', '1.4'
gem 'rspec', '3.9.0'

⚠️ [Caution]

Don't use the gem install command to install libraries. That command doesn't update Gemfile.

Go

If you want to use external libraries, do the following:

Add dependencies in go.mod.
- If you want to use the latest version of a library, you don't have to edit go.mod by yourself. Just adding an import statement to main.go is enough.

Example

require (
	github.com/huandu/xstrings v1.3.2
	github.com/shopspring/decimal v1.2.0
)

Swift

If you want to use external libraries, do the following:

Add dependencies in build.gradle.

Example

dependencies: [
  .package(url: "https://github.com/apple/swift-nio.git", from: "2.0.0"),
]

Rust

If you want to use external libraries, do the following:

Add dependencies in Cargo.toml.

Example

serde = "1.0.113"
rand = "0.7.3"

[Caution] Using HTTP client libraries

You cannot compile libraries that depend on openssl because OpenSSL is not installed in the Rust runtime environment. Some libraries can be compiled with features by using rustls instead of openssl. Here are examples shown below:

reqwest

reqwest = { version = "0.10", default-features = false, features = ["rustls-tls"] }

attohttp

attohttpc = { version = "0.13", default-features = false, features = ["tls-rustls"] }

FAQ

Library does not work.
- It may not work due to an older version, etc. If external libraries are not added correctly, please make sure if the version is correct then change the version and retry it.