Recently added problemsSaved problems

Categories DLC Contests Groups Teams Board

Solved Problem RankingStreak rankingDOJ Power ranking

Call for TasksLogin Register

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

P

platter

GrandmasterCertified

No organizationSince May 30, 2026

External accounts

Discordyoungukjo

platter's authored problems Submission history

No equipped banner

Current rating

2,557

-48

Peak 2,639 · Top 0.7%

UNRANKED0 Power

Solved problems

Titles

No equipped titles

local_fire_departmentStreak

Current 0 days

SMTWTFS

Rating history

= 1617 (+417), ExpertRank: 1DOJ Beginner Contest 2May 30, 2026, 1:00 PM = 1900 (+283), Candidate MasterRank: 2DOJ Contest 3Jun 14, 2026, 2:00 PM = 2142 (+242), MasterRank: 1DOJ Beginner Contest 3Jun 14, 2026, 7:00 PM = 2317 (+175), International MasterRank: 1DOJ Beginner Contest 4Jul 8, 2026, 9:00 PM = 2283 (-34), International MasterRank: 5SSHS Mini Contest 1Jul 10, 2026, 6:00 PM = 2422 (+139), GrandmasterRank: 1KOI 2nd Round Mock 2 [High]Jul 17, 2026, 9:00 AM = 2478 (+56), GrandmasterRank: 3DOJ Contest 4Jul 19, 2026, 8:00 PM = 2517 (+39), GrandmasterRank: 5EZ Contest Day 1Jul 25, 2026, 9:00 AM = 2545 (+28), GrandmasterRank: 5DOJ Contest 5Aug 1, 2026, 2:00 PM = 2603 (+58), GrandmasterRank: 21st SSAL Olympiad in InformaticsAug 3, 2026, 12:00 PM = 2639 (+36), GrandmasterRank: 1DOJ Beginner Contest 6Aug 30, 2026, 10:00 AM = 2605 (-34), GrandmasterRank: 8DOJ Contest 6Sep 4, 2026, 6:00 PM = 2557 (-48), GrandmasterRank: 7DOJ Grand Contest 1 (Div 1)Sep 24, 2026, 10:00 AM

OctNovDec2026FebMarAprMayJunJulAugSepOct

Longest solve streak: 1 days

1-23-56-910-14Freeze

Solve activity is counted from 06:00 in Korea time.

Participation history

14 total

DOJ Grand Contest 1 (Div 1)Window

Sep 24, 2026, 10:00 AM

Score 236Rank 7

DOJ Contest 6Window

Sep 4, 2026, 6:00 PM

Score 310Rank 8

DOJ Beginner Contest 6Window

Aug 30, 2026, 10:00 AM

Score 830Rank 1

1st SSAL Olympiad in InformaticsWindow

Aug 3, 2026, 12:00 PM

Score 267Rank 2

DOJ Contest 5Window

Aug 1, 2026, 2:00 PM

Score 710Rank 5

EZ Contest Day 1Window

Jul 25, 2026, 9:00 AM

Score 493Rank 5

DOJ Contest 4Window

Jul 19, 2026, 8:00 PM

Score 845Rank 3

KOI 2nd Round Mock 2 [High]Window

Jul 17, 2026, 9:00 AM

Score 400Rank 1

SSHS Mini Contest 1Window

Jul 10, 2026, 6:00 PM

Score 879Rank 5

DOJ Beginner Contest 4Rated

Jul 8, 2026, 9:00 PM

Score 856Rank 1

DOJ Beginner Contest 3Window

Jun 14, 2026, 7:00 PM

Score 850Rank 1

DOJ Contest 3Window

Jun 14, 2026, 2:00 PM

Score 714Rank 2

HighVirtual

Jun 3, 2026, 5:05 PM

DOJ Beginner Contest 2Window

May 30, 2026, 1:00 PM

Score 900Rank 1