#cli #web

app cargo-boj

Cargo-BOJ: test and submit solutions to BOJ problems

6 releases

0.3.3 May 11, 2023
0.3.2 May 11, 2023
0.3.0 Apr 8, 2023
0.2.0 Mar 31, 2023
0.1.0 Mar 23, 2023

#220 in Cargo plugins

Download history 17/week @ 2023-03-17 8/week @ 2023-03-24 24/week @ 2023-03-31 24/week @ 2023-04-07 5/week @ 2023-04-14 1/week @ 2023-04-21 60/week @ 2023-05-05 31/week @ 2023-05-12 8/week @ 2023-05-19

100 downloads per month

MIT license

639 lines


Test and submit solutions to BOJ (Baekjoon Online Judge) problems.

Defaults are geared towards Rust solutions, but non-Rust usage is supported as well.


A stable Rust toolchain.


cargo install cargo-boj

You can use the same command to update to the latest version.


The default usage of test and submit commands assume that cargo boj is being run at the crate root with either src/main.rs or src/bin/main.rs being the solution file. src/main.rs takes precedence if both are present.


Logging in to BOJ with ID and password cannot be automated because it is protected with reCaptcha. So, the users are expected to log in on their own browser first, and then copy relevant cookies into cargo-boj.

$ cargo boj login
First log in to www.acmicpc.net on your browser with auto-login enabled.
Then copy and paste two cookies for www.acmicpc.net from your browser.
Cookies set.


$ cargo boj login --bojautologin=3b1adXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --onlinejudge=n00lXXXXXXXXXXXXXXXXXXXXXX


Tests your code against example test cases for the given problem.

  • Test cases are fetched once and then cached.
  • A colored diff is provided when a test fails with Wrong Answer.
# Test main.rs against example test cases of problem 1000
$ cargo boj test 1000
# Test src/bin/sol_1000.rs
$ cargo boj test 1000 --bin=sol_1000
# Test 1000.py
$ cargo boj test 1000 --cmd='python 1000.py'


Submits your code to BOJ using the credentials provided with cargo boj login.

The default language is Rust 2021 (language ID 113). To submit solutions in other languages, refer to BOJ Help: language info.

# Submit main.rs as Rust 2021 solution to problem 1000. Code open setting follows account preference
$ cargo boj submit 1000
# Submit sol_1000.rs as Rust 2018 solution, with code closed
$ cargo boj submit 1000 --path=src/bin/sol_1000.rs --lang=94 --code-open=n

Using within BOJ contest

When you open a problem in a contest, the address will be like https://www.acmicpc.net/contest/problem/963/1. Then the problem ID for this problem is 963/1. You can use this ID in place of "problem ID" when using cargo boj test and cargo boj submit.


  • 0.3.3
    • Fix cargo boj test trying to run incorrect executable name when the file to run is src/main.rs
  • 0.3.1
    • Fix cargo boj test failing to find the built executable on Windows
  • 0.3.0
    • Add support for BOJ contests


~332K SLoC