Recently added problemsSaved problems

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
286	4949	Bronze IVB4	—	88	Not tried
287	tourist vs rainboytouristvsrainboy	Bronze IB1	—	79	Not tried
288

Treasure Hunttreasurehunt

Gold IIIG3

—

52

Not tried

Tile Coveringtilecover

Platinum VP5

—

30

Not tried

92%

86%

58%

37%