Blog entries - Codeforces

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Hello everyone!

I built CF UpsolveX, an automated upsolving companion for Codeforces.

It consists of a full-stack web application along with a Chrome extension that helps you track, prioritize, and consistently upsolve the problems you missed in contests.

Problem:

While participating in Codeforces contests, I often found myself saying:

"I'll upsolve the remaining problems tomorrow."

But after a few contests, dozens of unsolved problems start piling up and it becomes difficult to decide:

Which problems should be upsolved first?
Which contests still have pending problems?
How much progress has been made overall?
Whether I am actually being consistent with upsolving?

Since upsolving is one of the most important aspects of improvement in competitive programming, I felt there should be a better system for tracking and prioritizing missed problems.

Solution:

So I built CF UpsolveX.

It automatically tracks your missed problems across Codeforces contests, prioritizes them intelligently, and helps you stay consistent with upsolving.

The project consists of:

A full-stack web application.
A Chrome extension integrated directly into Codeforces.

Both work individually and remain perfectly synchronized.

Core Feature — Smart Priority Queue:

Instead of showing hundreds of unsolved problems in a flat list, CF UpsolveX ranks every problem using a custom priority algorithm:

Priority = w₁ × Recency + w₂ × Difficulty + w₃ × Attempts

The algorithm considers:

Recency — Recent contest problems rank higher (exponential decay).
Difficulty — Gaussian bell curve around YOUR rating.
Attempts — More failed attempts during the contest = higher priority.

Features:

Web Application:

Analytics Dashboard: Upsolve Velocity, Completion Rate, Current Streak & Rating Progression charts.
Contest History: Solved vs Upsolved vs Unsolved statistics & Progress tracking for every contest.
Prioritized Upsolve Queue across all contests.
User customization options: Maximum problem index filtering, Virtual contest toggle & Personalized preferences.
Automated Email reminders after each contests.