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Learn the signal
Know the clues, invariant, and reusable template before touching the problem list.
The open interview system
The playbook for passing software interviews.
Learn the patterns, drill the right problems, and keep a weekly rhythm. A complete curriculum—reframed as one calm, completely open workspace.
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PLAYBOOK / WEEK 03OPEN ACCESS
Pattern focus
Sliding Window
- 01Learn the invariant12 min
- 02Study the template08 min
- 03Solve the core set45 min
- 04Recall without notes10 min
FIELD NOTEExpand right. Repair from left. Track only what the condition needs.
20pattern guides
100core problems
8focused weeks
$0to access everything
The method
Fewer tabs.
Better repetitions.
Interview prep gets noisy fast. The playbook turns it into three passes you can repeat until recognition becomes automatic.
RUN
Practice the pattern
Solve a deliberate progression instead of collecting random green checkmarks.
RECALL
Close the notes
Use quick drills and spaced review to make the idea available under pressure.
Pattern library
Start where you hesitate.
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Arrays & Hashing
Turn repeated lookup work into constant-time decisions.
Sliding Window
Recognize when a moving range replaces nested loops.
Binary Search
Find the boundary, write the invariant, skip the guesswork.
Trees
Choose a traversal by the information you need to carry.
Graphs
Model relationships first, then pick the lightest traversal.
Dynamic Programming
Define the state before you reach for the recurrence.
A route through the material
Eight weeks.
One visible finish line.
Follow the suggested sequence or jump straight to a weak spot. The roadmap is guidance, not another gate.
View the roadmapFoundations
01Arrays, hashing, pointers, windows
Structure
02Linked lists, trees, tries, heaps
Search
03Graphs, backtracking, intervals
Optimization
04Greedy, DP, mixed review
The whole system, in the open
Good preparation shouldn’t begin with a checkout screen.
Every lesson, curated problem, roadmap, quiz, and flashcard lives in one focused experience—with nothing locked between you and the next rep.
Your next rep starts here