LeetCode Ebbinghaus Tracker

### 1. Product Overview **LeetCode Ebbinghaus Tracker** is a productivity-first Google Chrome Extension (Manifest V3) engineered for software engineers, technical interview candidates, and competitive programmers. By integrating the **Ebbinghaus Forgetting Curve** and the **SM-2 Spaced Repetition Algorithm** natively into the LeetCode workflow, it empowers developers to master algorithms systematically and eliminate the frustrating cycle of solving hundreds of problems only to forget their solutions weeks later. --- ### 2. Core Purpose: What Problem Does It Solve? The hidden pitfall in algorithm preparation is never the initial difficulty—it is **rapid cognitive decay and the lack of structured review**: 1. **High Forgetting Curve**: Solving a challenging problem feels rewarding in the moment. However, according to the Ebbinghaus model, over 60% of unreviewed technical knowledge fades within 3 days, and near 100% dissolves within two weeks, rendering initial effort wasted. 2. **High Bookkeeping Overhead**: Managing review schedules in spreadsheets, Notion, or text files requires constant context-switching to copy URLs, record problem IDs, and calculate review dates. This high-friction routine is rarely sustainable for more than a week. 3. **Absence of Quantitative Review Signals**: Developers often stare at LeetCode wondering what to practice today, unaware of which problems are due for review, which ones are nearing critical memory decay, or which tricky patterns need immediate reinforcement. **What This Extension Accomplishes**: * **Frictionless Auto-Ingestion**: Automatically tracks problems when your submission receives an Accepted (AC) verdict—zero copy-pasting, zero manual spreadsheets. * **Intelligent Spaced Repetition**: Dynamically adapts review intervals (e.g., 1d → 2d → 4d → 7d → 15d → 30d...) for each problem based on your recall rating (Again / Hard / Good / Easy) using the SM-2 algorithm. * **Closed-Loop Daily Mastery**: Displays pending review counts directly on your browser toolbar badge. One click takes you directly to due problems for a timed second attempt, closing the loop with immediate feedback grading. --- ### 3. Why You Should Install It #### ① Zero Friction: Code & Auto-Track Stay in your flow state on LeetCode. The moment your code passes with "Accepted", the extension extracts the problem number, title, difficulty, and algorithm tags, instantly scheduling your first spaced review. Keep 100% of your focus on algorithmic thinking while bookkeeping happens invisibly. #### ② Scientifically Proven: 3x+ Memory Retention (SM-2 Engine) Ditch naive, brute-force re-solving. Each problem possesses its own memory decay factor and progress ladder: * **Speedrun AC (Easy)**: Jumps two stages ahead to save valuable prep time. * **Solved Naturally (Good)**: Progresses smoothly to the next scheduled interval. * **Struggled (Hard)**: Retains the current stage to solidify fundamentals. * **Blackout / Stuck (Again)**: Resets to Stage 1 for mandatory next-day reinforcement. Achieve peak recall rates with the minimum necessary time investment. #### ③ Complete Review Visibility: Prominent Due Dates & Mastery Trajectories * **High-Contrast Schedule Banners**: Every problem card features an unambiguous review bar (e.g., `📅 Next Review: 2026-09-15`) paired with distinct status badges (`Due Today`, `Overdue by Nd`, `Tomorrow`, `in Nd`). * **Latest Feedback Highlight & Historical Progression**: Instantly see your latest rating (e.g., `🟢 Good · Solved AC`) alongside your full stage progression (`[🔴 Again] → [🟡 Hard] → [🟢 Good ★]`) to spot weaknesses at a glance. #### ④ Solution Notes Card: Retain Key Insights, Not Boilerplate True algorithm mastery is about internalizing heuristics and pattern triggers, not memorizing code syntax. Each problem card includes an inline expandable notes editor to jot down key insights, corner-case pitfalls, and algorithm patterns. #### ⑤ 100% Local-First: Absolute Data Privacy & Portability All problem data, review history, and notes live strictly inside your local browser (`chrome.storage.local`): * Zero external servers, no mandatory account sign-up, zero telemetries, and no tracking. * Full JSON export and import capabilities for effortless backups and multi-machine migration. --- ### 4. Feature Highlights | Module | Capability | | :--- | :--- | | **Due Queue** | Aggregates all due and overdue problems with one-click rating and real-time badge updates | | **Completed List** | Logs today’s completed reviews with stage advancement confirmations | | **Problem Library** | Global problem catalog with instant search, next-review countdowns, and notes cards | | **7-Day Calendar Forecast** | Bar charts predicting upcoming daily review loads and overall memory retention health | | **Floating In-Page Capsule** | Minimalist widget on LeetCode for on-page rating, auto AC tracking, and note-taking | | **Bilingual Internationalization (i18n)** | Native support for 🇨🇳 简体中文 and 🇺🇸 English with zero hardcoded strings | --- ### 5. v1.0.1 Release Notes * **Prominent Next Review Date**: High-visibility schedule banners inside problem cards with relative countdown badges (Due Today / Overdue / Tomorrow / in Nd). * **Mastery Trajectory & Current Grade Highlight**: Prominently features the latest rating alongside the historical review progression chain. * **Inline Solution Notes**: Instant in-card notes editing across both popup and in-page capsule widgets. * **Resilient AC Detection**: Re-engineered submission detection and SPA route watcher with GraphQL metadata fallback, completely eliminating missed AC tracking for untracked problems. * **Bilingual Parity & Test Suite Reliability**: Zero hardcoded strings across all components; 58 unit tests passing with 100% reliability. --- ### 6. Installation Guide (Chrome / Chromium) 1. Download the release package: [`leetcode-ebbinghaus-tracker-v1.0.1.zip`](./leetcode-ebbinghaus-tracker-v1.0.1.zip). 2. Open Chrome and nav…