Reference sheets

Copy-ready templates and problem patterns, rendered from the study packet's reference sheets.

• Python Standard Library

  collections, itertools, functools, bisect, and heapq — the built-ins to reach for first, with the calls that matter.

• Data Structures

  Operations and Big-O for every Python built-in type, plus trees, graphs, and heaps.

• Algorithm Templates

  Copy-ready templates for binary search, two pointers, sliding window, BFS/DFS, backtracking, and DP.

• Big-O Complexity

  Time complexities ranked, input-size rules of thumb, and amortized analysis.

• Common Patterns

  The recurring shapes of interview problems and the move that solves each one.

• System Design

  Load balancing, caching, message queues, database scaling, and API design.

• Interview Day Guide

  Day-of logistics, a communication framework, timing strategy, and what to keep open.

• Cross-Reference Guide

  Master lookup: problem description to implementation, a decision tree, and a keyword cheat sheet.

• Python 3.14 & Modern Patterns

  PEP 750 t-strings, PEP 649 lazy annotations, PEP 695 type syntax, Hypothesis, and advanced typing.

• Whiteboard Performance & Panic Protocol

  What's actually scored, the CLARP loop, panic first-aid, and collaboration scripts.

• 14-Day Whiteboard Ramp

  A day-by-day schedule: which drills to run and which sheets to keep open.