DOJ Guide

A short overview of judging, ratings, difficulty, and public ranking rules.

Judging environment

Each problem may have different time limits, memory limits, and judging rules. OI-style problems can award partial scores by subtask, and some problems use special judges or graders.

Submission detail pages show scores, per-subtask results, per-testcase verdicts, and resource usage.

Rating system

After rated contests end, Elo updates are applied to registered participants. Only certified accounts appear on the public ladder, while uncertified accounts may remain internal-only.

Difficulty system

Problem difficulty is grouped into Bronze, Silver, Gold, Platinum, Diamond, and Ruby tiers, each split into I-V divisions. Some problems may still appear as Unrated.