30-day review index
Review the first family in a compact cheatsheet. Remaining family previews are clearly marked Pro only.
Pattern-first interview review
PrepStack
Algorithm Patterns
把算法题压缩成可迁移、可复习的模板系统。Free members can study the first pattern family and solution routes for LC 1–100; the complete library is available with Pro.
1 familyfully open in both languages / 双语开放
LC 1–100candidate solution routes included / 候选解法路线
69total patterns; remaining library is Pro / 完整模板库
Knowledge base
Open the first pattern family, every related problem route, and LC 1–100. Locked material stays visible as a Pro preview.
Learning graphs
Explore the first family map and see which additional graph views unlock with Pro.
Template collection
Search every pattern by title, family, or keyword; free entries open fully and locked entries show the Pro boundary.