[Feature]: Add problem difficulty breakdown (Easy / Medium / Hard) to each leaderboard entry

[divyanshim27]

Summary

The leaderboard currently shows only a total problems-solved count per user. The LeetCode API (used via the leetcode-api service) returns a breakdown by difficulty — Easy, Medium, Hard — but this data is not displayed in the UI. Surfacing the difficulty split would give a much more meaningful picture of each student's skill level and effort.

Problem

• Raw total-solved counts treat an Easy problem the same as a Hard problem, which does not accurately reflect a student's problem-solving depth.
• Two students with the same total count but vastly different difficulty distributions appear identical on the leaderboard — this is misleading.
• The underlying API already returns this data; it is just not being used in the frontend rendering.
• Competitive platforms like LeetCode's own weekly contest leaderboard prominently feature difficulty-based breakdowns because they are the primary signal of relative performance.

Proposed Solution

Data layer (scripts/sync-leaderboard.js):

Ensure easySolved, mediumSolved, and hardSolved are persisted in the leaderboard JSON alongside totalSolved.

Frontend (frontend/):

Add a compact difficulty bar or three-column breakdown under each user's name:

Rank Username Total Easy Medium Hard
1 student123 142 61 52 29
2 coder456 138 70 48 20

Optionally, colour-code the columns (green / yellow / red) to match LeetCode's own convention.

Sorting option:

Add a "Sort by Hard" toggle so users competing at the advanced level have a relevant ranking axis.

I can implement the data layer and frontend changes in a single PR. Could you assign this issue to me?

Labels: enhancement, feature, ui, data, GSSoC 2026

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[Yashaswini-K-P]

This issue already exists and marked as blocked for now

[jagdish-15]

From the screenshot above, you can clearly see that many users with a higher total solved count are ranked below users with a lower total solved count. This is because the leaderboard uses a weighted scoring system, not the raw total solved count. So the initial assumption in this issue is incorrect.

As for the sorting options, that's already covered in #272, as @Yashaswini-K-P pointed out.

If this issue isn't proposing anything beyond what's already covered, feel free to close it.

[aaniya22]

pls assign this to me under gssoc