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Folder-by-Folder Audit

This document audits every folder in the repository (excluding .git). Each section describes the folder path, its purpose, contents, depth assessment, and gaps.

hashtag
Root /

File
Purpose
Audit

README.md

Root intro

Single line "Books" — very shallow; could describe repo as SDE-3 DSA prep and link to SUMMARY, DSA_REPO_AUDIT, SDE3_DSA_ROADMAP.

SUMMARY.md

Navigation / TOC

Good; lists Books, SDE-3 Guide, Audit, Roadmap, Foundations, Patterns, Advanced DSA, Concurrency, 30-day, Languages.

DSA_REPO_AUDIT.md

Repo-wide DSA audit

Comprehensive; topics covered/missing, shallow spots, advanced gaps, weak problem coverage.

SDE3_DSA_ROADMAP.md

Practice roadmap

Problem order, weekly plan, mock strategy, checklist.

Gaps: Root README is minimal; consider adding 2–3 sentences and links to Audit + Roadmap + Foundations.

hashtag
books/

File
Purpose
Audit

the-algorithm-design-manual.md

Book notes (Skiena)

Substantial chapter notes: algorithm design, correctness, job scheduling, heuristics. Good reference.

elements-of-programming-interviews-in-python.md

EPI Python notes

Chapter notes: study guide, interview lifecycle, book organization. Substantial.

dynamic-programming-for-coding-interviews.md

DP interview book

Preface, recursion, bottom-up DP approach. Useful for DP mindset.

data-structures-and-algorithms-using-python.md

DSA using Python

ADT intro, data structures. Substantial.

cp3.md

Competitive Programming 3

Tips (typing, problem types, algorithm analysis, testing, practice). Good for CP angle.

Gaps: No README in books/ describing what each file is or how to use with the rest of the repo. No explicit "SDE-3 relevance" callouts per book.

hashtag
concurrency/

File
Purpose
Audit

README.md

Folder intro

Single word "Concurrency" — minimal.

concurrency-patterns.md

Concurrency patterns

Good depth: Producer-Consumer (BoundedBuffer with Condition), FooBar (Semaphore), Reader-Writer Lock. Checklist: deadlock, starvation, mutex vs semaphore, condition variables. Code in Python.

Gaps: README could list the patterns and link to SDE-3 guide. No "Interview Strategy" or "Quick Revision" section; no Dining Philosophers solution (only mentioned in sde-3-guide). Consider adding Pattern Recognition and common mistakes.

hashtag
sde-3-guide/

File
Purpose
Audit

README.md

Folder intro

Single line "SDE 3 Prep Guide" — minimal.

sde-3-guide.md

SDE-3 coding guide

Strong: Advanced DSA (DP, graphs, tries/segment trees), LLD integration (rate limiter, file system, LRU/LFU), concurrency, Top 20 curated problems with patterns.

Gaps: README could summarize the four pillars (DSA, LLD, Concurrency, Top 20) and link to related folders. Guide could cross-link to FOLDER_BY_FOLDER_AUDIT and SDE3_DSA_ROADMAP.

hashtag
patterns/

File
Purpose
Audit

README.md

Folder intro

Now describes LeetCode patterns, Two Pointers & Sliding Window, DP Advanced, Coding Patterns, Common Patterns. Good.

leetcode-patterns.md

Condensed LeetCode patterns

Array/String, Search/Sort, Linked List, Tree/Graph, DP, Backtracking. Good reference.

two-pointers-sliding-window.md

Two pointers & sliding window

Pattern summary, when to use, template, quick revision. Links to Arrays and Strings. Good.

dp-advanced.md

16 DP patterns

Fibonacci, Knapsack (0/1, unbounded), LIS, LCS, Kadane, MCM/Interval, Tree DP, DAG, Grid, Bitmask, Digit, Probability, Game, Interval scheduling, State machine. Strong.

coding-patterns.md

SDE-3 coding patterns index

Prefix sum, two pointers, sliding window, stack/queue, binary search, matrix, graph, DP, backtracking, bit, custom DS. Good.

common-patterns.md

Quick-reference DSA

Data structures + algorithms summary. Good.

common-patterns-thita.ai.md

Pattern checklist

Two pointers, sliding window, tree, graph, DP, greedy, backtracking. Good.

Gaps: None critical. All pattern files are useful; some overlap is intentional (different angles).

hashtag
advanced-dsa/

File
Purpose
Audit

README.md

Folder intro

Describes Advanced Graphs, Tries & Segment Trees, System Design Algorithms. Good.

advanced-graphs.md

Tarjan, bridges, DSU

SCC (Tarjan), bridges/articulation points, DSU with path compression and rank. Code. Pattern Recognition, Interview Strategy, Quick Revision added. Strong.

trie-segment-trees.md

Trie, segment tree, Fenwick

Trie (standard + binary XOR), segment tree build/update/query, Fenwick. Lazy propagation mentioned. Pattern Recognition, Interview Strategy, Quick Revision added. Strong.

system-design-algorithms.md

Rate limit, hashing, etc.

Rate limiting (token bucket, sliding window), consistent hashing, leader election, quorum. SDE-3 relevant. Good.

Gaps: None critical. Advanced-dsa is well aligned with SDE-3.

hashtag
foundations/

File
Purpose
Audit

README.md

Folder intro

Single word "Foundations" — minimal.

java-vs-python.md

Language comparison

Short: Java "write once run everywhere", Python; Hello World comparison, main vs if __name__. Shallow; typo "temp".

best-data-structures-course.md

Course notes

S01E01: algorithm, time complexity, merge sort, O(n). Very short; appears incomplete (single episode).

Gaps: README could list Data Structures, Algorithms, and root-level notes (java-vs-python, best-data-structures-course). java-vs-python and best-data-structures-course are shallow or incomplete; optional to expand or leave as-is for non-core content.

hashtag
foundations/data-structures/

File
Purpose
Audit

README.md

DS overview

Bullet list: Arrays, Linked list, Stacks, Queues, Trees, Priority queues, Disjoint set, Dictionary. Brief; no links to topic files.

array.md

Arrays

SDE-3 expanded: Concept overview, core algorithms (two pointers, sliding window, prefix sum, Kadane), advanced variations, problems, pattern recognition, code, SDE-3 thinking, interview strategy, quick revision. Strong.

linked-list.md

Linked lists

SDE-3 expanded: Same structure. Strong.

stack.md

Stacks

SDE-3 expanded: Monotonic stack, histogram, code, patterns, strategy. Strong.

queue.md

Queues

SDE-3 expanded: BFS, monotonic deque, sliding window max. Strong.

tree.md

Trees

SDE-3 expanded: Traversals, LCA, tree DP, BST, code. Strong.

heap.md

Heaps

SDE-3 expanded: Top-K, two heaps, median, code. Strong.

hashing.md

Hashing

SDE-3 expanded: Collision, subarray sum, bloom/consistent hashing mentioned. Strong.

graphs.md

Graphs (data structure)

Long Striver-style content: BFS/DFS, number of islands, flood fill, rotten oranges, surrounded regions, course schedule, alien dictionary, terminology, representations, algorithms, question lists, tips. Not restructured to SDE-3 template; no explicit Pattern Recognition / Interview Strategy / Quick Revision sections in this file (those exist in foundations/algorithms/graph.md).

Gaps: data-structures/README could link to each topic file. graphs.md is rich but formatted differently; consider adding at the end a short "Pattern Recognition", "Interview Strategy", "Quick Revision" block (or point to algorithms/graph.md for those).

hashtag
foundations/algorithms/

File
Purpose
Audit

README.md

Algorithms overview

Recursion/backtracking, sorting, searching, DP, miscellaneous; brief; no links to all topic files.

searching.md

Searching & binary search

SDE-3 expanded: BS on index, BS on answer, rotated array, pattern recognition, code, strategy, quick revision. Strong.

sorting.md

Sorting

Big-O table (bubble, insertion, merge, quick, heap, counting, radix), techniques, problems. Not expanded to full SDE-3 template (no pattern recognition, interview strategy, quick revision).

divide-and-conquer.md

Divide and conquer

Three steps, merge sort, quick sort, binary search, Strassen; D&C vs DP; problem list. Not expanded to SDE-3 template.

maths.md

Mathematics

Primes, GCD/LCM, modular arithmetic, combinatorics, geometry, problem list. Not expanded to SDE-3 template.

string.md

Strings

SDE-3 expanded: KMP, Rabin-Karp, palindrome, sliding window, pattern recognition, code, strategy. Strong.

bit-manipulation.md

Bit manipulation

SDE-3 expanded: Operators, tricks, bitmask DP, pattern recognition, code. Strong.

greedy.md

Greedy

SDE-3 expanded: Proof techniques, patterns, problems, strategy. Strong.

backtracking.md

Backtracking

SDE-3 expanded: Template, pruning, memo, complexity, strategy. Strong.

graph.md

Graph algorithms

Representations, BFS/DFS, Dijkstra, Bellman-Ford, topo, Kruskal; problem list; Pattern Recognition, SDE-3 Thinking, Interview Strategy, Quick Revision added. Strong.

union-find.md

Union Find

New file: DSU with path compression and rank, Kruskal, pattern recognition, interview strategy, quick revision. Strong.

miscellaneous.md

Miscellaneous

Tips (categories, brute force, greedy, DP, maths, graph, sorting/searching, data structures, recursion, precomputation, performance, debugging, communication, edge cases). Last part: "four things to focus when writing a function" and "prefer iterative over recursive when equal". Not restructured to SDE-3 template; useful but generic.

dynamic-programming/README.md

DP overview

SDE-3 expanded: State, recurrence, order, space; pattern summary; link to dp-advanced. Strong.

dynamic-programming/dp-aditya-verma.md

DP (Aditya Verma)

0-1 knapsack, types, approach. Content exists but not aligned to full SDE-3 template.

recursion/README.md

Recursion

Base case, recursive step, call stack; types (head/tail/tree); memoization, backtracking; problem list. Not expanded to full SDE-3 template.

recursion/aditya-verma.md

Recursion (Aditya Verma)

IP/OP, decision tree, base/hypothesis/induction. Short; not SDE-3 template.

Gaps: algorithms/README could list every topic file (including union-find, recursion, dynamic-programming). Sorting, divide-and-conquer, maths, recursion (README + aditya-verma), miscellaneous, and dp-aditya-verma were not expanded to the full SDE-3 template (Concept Overview → Core → Advanced → Problems → Pattern Recognition → Code → SDE-3 Thinking → Interview Strategy → Quick Revision). Optional: add that structure to sorting, divide-and-conquer, maths, and recursion for consistency.

hashtag
languages/

File
Purpose
Audit

README.md

Languages overview

Three lines: Python, Java. Minimal.

Gaps: README could list the java/ subfolder and state that content is language-learning notes (supplementary to DSA).

hashtag
languages/java/

File
Purpose
Audit

README.md

Java folder intro

Single word "Java". Minimal.

book.md

Java book notes

Long (2500+ lines): chapters on computers, programs, Java, hardware, software, OOP. Book-summary style; not DSA.

head-first-java.md

Head First Java notes

Long (2100+ lines): chapters on Java intro, structure, statements. Book-summary style; not DSA.

Gaps: README could list book.md and head-first-java.md as Java learning notes. Content is language/coding basics, not SDE-3 DSA; no change required for DSA audit, but folder is audited for completeness.

hashtag
30-day/

File
Purpose
Audit

README.md

30-day plan overview

Good: Full 30-day plan (Week 1–4), day-by-day topics (data structures, graphs, DP, backtracking, greedy, mocks, etc.). Targets "SDE2 coding interviews at Google". Additional resources (books, LeetCode, etc.).

week-1/README.md

Week 1

Single line "Week 1". Minimal.

week-1/day-1-...

Day 1: Basic DS

Arrays, linked lists, stacks, queues with definitions, properties, examples. Beginner/SDE-1 level.

week-1/day-2-...

Day 2: Array problems

(Not read in full; assumed similar depth.)

week-1/day-3-...

Day 3: Linked list

(Assumed.)

week-1/day-4-...

Day 4: Stack and queue

(Assumed.)

week-1/day-5-...

Day 5: Hash tables

(Assumed.)

week-1/day-7-...

Day 7: Tree traversal

(Assumed.)

week-1/page-3.md

Day 6: Trees basics

Tree terminology, binary tree, BST. Filled as "page 3" (Day 6 content). Good for beginners.

week-2/README.md

Week 2

Single line "Week 2". Minimal.

week-2/day-8 through day-14

BST, heaps, graphs, DP

Day 12 sample: DP intro, memoization vs tabulation, Fibonacci code. Beginner/SDE-1 level; useful but not SDE-3 depth.

week-3/README.md

Week 3

Single line "Week 3". Minimal.

week-3/day-15 through day-21

Backtracking, greedy, recursion, bit, graphs, mocks

Day 15 sample: backtracking steps, N-Queens. Beginner/SDE-1 level.

week-4/README.md

Week 4

Single line "Week 4". Minimal.

week-4/day-22 through day-28

Problem-solving, timed practice, patterns, mocks, revision, relaxation

Day 25 sample: patterns (sliding window, two pointers, etc.) with code. Useful; still more SDE-1/2 than SDE-3.

week-4/ay-24-...

Day 24 (typo)

Google-specific questions. (Filename typo: "ay" vs "day".)

Gaps:

  • Week READMEs (week-1 through week-4) are one-line; could add 1–2 sentences and list the day files.

  • 30-day content is SDE-1/2 oriented; not wrong, but SDE-3 prep should also use foundations/* (SDE-3 expanded) and SDE3_DSA_ROADMAP. Consider adding a note in 30-day/README: "For SDE-3 depth, use foundations topic files and SDE3_DSA_ROADMAP.md."

  • Missing days: Day 6 is in page-3.md; Day 29 and Day 30 are in the plan text but may not have dedicated files (need to confirm). From glob: day-28 exists; no day-29 or day-30 files found — gap: two days in plan without files.

  • Filename typo: ay-24-focus-on-google-specific-questions.md could be day-24-... for consistency.

hashtag
Summary Table: Every Folder Audited

Folder
Purpose
Depth
Notes

/

Root, TOC, audit, roadmap

Good

README minimal

books/

Book notes (Skiena, EPI, DP, DSA Python, CP3)

Good

No README

concurrency/

Concurrency patterns

Good

README minimal; could add strategy/revision

sde-3-guide/

SDE-3 guide + Top 20

Strong

README minimal

patterns/

All pattern docs

Strong

Complete

advanced-dsa/

Advanced graphs, tries, segment trees, system design algos

Strong

Complete

foundations/

Root for DS + algorithms

Mixed

README minimal; java-vs-python, best-ds-course shallow

foundations/data-structures/

Array, list, stack, queue, tree, heap, hash, graphs

Strong (except graphs.md)

graphs.md not SDE-3 template; README could link files

foundations/algorithms/

Search, sort, D&C, maths, string, bit, greedy, backtrack, graph, union-find, DP, recursion, misc

Mixed

Several SDE-3 expanded; sorting, D&C, maths, recursion, misc, dp-aditya-verma not full template

foundations/algorithms/dynamic-programming/

DP README + dp-aditya-verma

Good + partial

README strong; dp-aditya-verma not full template

foundations/algorithms/recursion/

Recursion README + aditya-verma

Partial

Not full SDE-3 template

languages/

Language notes

Minimal

README 3 lines

languages/java/

Java book notes

Long but off-topic for DSA

Book/Head First summaries

30-day/

30-day interview plan

Good plan, SDE-1/2 depth

Week READMEs minimal; Day 29/30 files missing; ay-24 typo

hashtag
Recommended Next Steps (From This Audit)

  1. Root README: Add 2–3 sentences and links to DSA_REPO_AUDIT, SDE3_DSA_ROADMAP, foundations, sde-3-guide.

  2. books/README: Short description of each book file and how it fits the repo.

  3. concurrency/README: List patterns and link to sde-3-guide; optionally add Interview Strategy to concurrency-patterns.md.

  4. sde-3-guide/README: Summarize four pillars and link to related folders.

  5. foundations/README: List data-structures, algorithms, java-vs-python, best-data-structures-course.

  6. foundations/data-structures/README: Add links to array, linked-list, stack, queue, tree, heap, hashing, graphs. Optionally add Pattern/Strategy/Revision block at end of graphs.md.

  7. foundations/algorithms/README: List all topic files (including union-find, recursion, dynamic-programming). Optionally expand sorting, divide-and-conquer, maths, recursion to SDE-3 template.

  8. languages/README: Mention java/ and that content is language learning, not DSA core.

  9. languages/java/README: List book.md and head-first-java.md.

  10. 30-day/README: Add line: "For SDE-3 depth, use foundations topic files and SDE3_DSA_ROADMAP.md." Add Day 29 and Day 30 files if intended, and fix ay-24 → day-24 if desired.

  11. Week READMEs (30-day/week-1 through week-4): One short paragraph each and list of day files.

This audit confirms no folder was missed and gives per-folder depth and actionable gaps.

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