Recently added problemsSaved problemsWorkbooks

Categories DLC Contests Groups Teams Board

Solved Problem RankingStreak rankingDOJ Power ranking

Call for TasksLogin Register

Problems

DOJ

Community online judge with OI-style subtask scoring, Elo ratings, and Discord-backed certification.

Problems

Problems Categories

Community

Contests Ranking Board Notices Host an external contest Guide

Account

Login Register Judge Status

Policy

Terms of Service DLC Rules Privacy API documentation Language runtimes Contest rank rewards Rating and performance

© 2026 DOJ

All rights reserved

Advanced filters (1)

Difficulty range

0Unrated

-

30I

Sort by

Direction

Recommendation range

Solved users

Unsolved users

Tags

Exclude selected tags

Find similar problems

ID	Problems	Difficulty	Accepted	Solves	Status
107	A+Baplusb	Bronze VB5	—	95	Not tried
120	네가 짝 하면 나도 짝 한번clapclap	Bronze IVB4	—	197	Not tried
299	박스 쌓기

box

Silver IIIS3

—

19

Not tried

별점 테러rate-terror

Silver IVS4

—

25

Not tried

마법소녀mahou-shoujo

Bronze IIB2

—

137

Not tried

마녀재판majo-saiban

Silver VS5

—

128

Not tried

82%

64%

63%

57%

70%

63%