📄 High-Density 1-Page References

Printable Coding Interview Cheat Sheets

High-yield, 1-page reference sheets specifically formatted for rapid revision and clean browser printing (Ctrl/Cmd + P). Perfect for desk reference, quick morning-of revision, and offline study.

✓ 100% Free Forever ✓ Print-Ready CSS (No Nav/Ads on Paper) ✓ Updated for 2026 FAANG Loops

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Top 15 Patterns

Algorithms • 1-Page PDF Ready

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The 15 Algorithmic Patterns that Solve 85% of LeetCode Medium & Hard Questions

High-density 1-page reference of the 15 fundamental coding interview patterns with recognition triggers, time/space bounds, and standard templates.

› If input array is sorted: Two Pointers or Binary Search (O(log n) or O(n))

› If asked for contiguous subarray/substring maximum or minimum: Sliding Window (O(n))

› If asked for Top K or Kth largest/smallest element: Heap / Priority Queue (O(n log k))

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Big-O & Data Structures

Reference • 1-Page PDF Ready

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Time & Space Complexity for All Core Data Structures & Sorting Algorithms

Instant 1-page lookup for worst, average, and best-case complexities across Arrays, Linked Lists, Trees, Heaps, and Sorts.

› O(1) < O(log n) < O(n) < O(n log n) < O(n²) < O(2ⁿ) < O(n!)

› 10^7 operations ≈ 1 second of CPU execution in competitive coding / interview sandbox

› For N = 10^5: O(n log n) or O(n) required (O(n²) will Time Out)

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System Design Cheat Sheet

Architecture • 1-Page PDF Ready

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Latency Numbers, Back-of-the-Envelope Math, and 4-Step Architecture Framework

High-density printable architecture guide covering latency hierarchy numbers, storage calculations, and interview templates.

› 1 Million Daily Active Users (DAU) at 10 requests/day = 100 requests/sec average, 200–300 peak QPS

› L1 Cache: 0.5 ns | RAM: 100 ns | SSD Read: 150 µs | Disk Read: 10 ms | Cross-country RTT: 150 ms

› Read-heavy (100:1)? Use Redis/Memcached with Cache-Aside pattern

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Behavioral STAR Matrix

Behavioral • 1-Page PDF Ready

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Master the STAR Framework, Conflict Resolution Scripts, and Impact Formulas

1-page printable guide with fill-in-the-blank STAR storytelling templates and formulas for turning vague past work into quantified impact.

› Allocate words: Situation 15%, Task 10%, Action 60% (What YOU personally did), Result 15% (Metrics)

› Use "I", never "We": Interviewers want to evaluate your contribution, not the team’s

› Always have metrics: Latency drop %, dollar savings, hours saved, bug count reduction

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CS Core Vault

CS Fundamentals • 1-Page PDF Ready

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High-Yield Formulae, Key Trade-offs, and Canonical Questions across OS, DBMS, CN, and OOP

High-density 1-page printable reference sheet summarizing the four core Computer Science subjects tested in technical interviews and written screening rounds.

› Deadlock 4 Conditions: Mutual exclusion, Hold and wait, No preemption, Circular wait (Break any 1 to prevent)

› ACID: Atomicity (all/none), Consistency (state rules), Isolation (concurrency levels), Durability (disk write)

› TCP 3-Way Handshake: SYN -> SYN-ACK -> ACK. Termination is 4-way because both directions close independently

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