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Load a Codeforces Problem

Paste problem URLs or codes (single or comma/space-separated, e.g. 1904A, 1904B, 1904C). Only one problem is active in the solve session at a time.

Add Problems to Practice Queue

Supports single codes/URLs or multiple separated by commas or spaces. All loaded problems appear in your queue on the Problems page.

Problems & Practice Queue

Manage your practice queue. Only the active problem runs the stopwatch timer.

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Your practice queue is empty. Load one or more Codeforces problems to start solving.

Go to Load Problems

Active Solve Session

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Problem index

Practice Queue

#	When	Problem	Rating	Verdict	Time	Action

Post-Solve Reflection

Answer all five questions after you finish solving.

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Load a problem before writing a reflection.

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Post-solve reflection

Key observation

What made me stuck

Pattern

Future recognition

Simplest implementation

Key observation The idea that unlocked the problem.	Markdown supported: bold, italic, `code`, ```cpp, $O(N)$ , `- list`
What made me stuck Where you spent time / what was missing.	Main reason: Markdown supported: bold, italic, `code`, ```cpp, $O(N)$ , `- list`
Pattern Algorithm, technique, or recurring pattern.	Markdown supported: bold, italic, `code`, ```cpp, $O(N)$ , `- list`
Future recognition Clue or trigger you want to recognize next time.	Markdown supported: bold, italic, `code`, ```cpp, $O(N)$ , `- list`
Simplest implementation Clean implementation in your own words.	Markdown supported: bold, italic, `code`, ```cpp, $O(N)$ , `- list`

Edit Reflection

Update your reflection notes and lessons for your solved problem.

Reflection Details

Problem	—
Codeforces Link	—
Time Spent	—
Problem Tags	Problem tags

Key observation The idea that unlocked the problem.	Markdown supported: bold, italic, `code`, ```cpp, $O(N)$ , `- list`
What made me stuck Where you spent time / what was missing.	Main reason: Markdown supported: bold, italic, `code`, ```cpp, $O(N)$ , `- list`
Pattern Algorithm, technique, or recurring pattern.	Markdown supported: bold, italic, `code`, ```cpp, $O(N)$ , `- list`
Future recognition Clue or trigger you want to recognize next time.	Markdown supported: bold, italic, `code`, ```cpp, $O(N)$ , `- list`
Simplest implementation Clean implementation in your own words.	Markdown supported: bold, italic, `code`, ```cpp, $O(N)$ , `- list`

Your Progress

Completed problem reflections and practice history. Click a row to expand reflection notes.

Completed Reflections

Reflection Rule

How to turn one hard solve into durable skill.

After a difficult problem

Don't immediately force another problem of the same difficulty. Slow down and extract the lesson while it is still fresh.

Spend 10–15 minutes writing down:

Observation — the key idea that unlocked the problem.
Mistake — what made you stuck and how you escaped.
Pattern — the algorithm family or technique name.
Future recognition — what you will look for next time.
Implementation — the simplest clean way to code it.

These map directly to the five questions on the Reflect page.

How the app works

Load Problem: Paste any Codeforces URL or code (e.g., 1904A) on the Load page. Metadata, rating, and tags are fetched automatically.
Solve & Track: Open the problem on Codeforces and tackle it while the live stopwatch runs on the Problem page.
Reflect Deeply: Complete five structured reflection prompts on the Reflect page before moving on.
Review & Master: Search, filter, and review your historical insights in your personal Progress.

Stuck Reasons

Why you got stuck, across all your reflections. Click a reason to see those reflections on Progress. Tags by time →

All stuck reasons

Tags by Time

Which topics take you longest, across all your reflections. Click a tag to see those reflections on Progress. Stuck reasons →

All tags

Review

Recall each problem's key idea before revealing your reflection, then grade yourself honestly. What you remember comes back later; what you forget comes back tomorrow.

Review session

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Schedule

Manage Database Problems

Remove problems from everywhere in the database (reflections, practice queue, and active session).

Database Records Overview

Code	Problem Name	Rating	Time	Solved At	Action
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Content

Markdown supported: **bold**, *italic*, # heading, `code`, ```cpp, $O(N)$ , - list, [link](https://…), tables, and collapsible sections: <spoiler summary="Title"> … </spoiler>, each tag on its own line