The Sheets, Mapped

There are half a dozen well-known DSA sheets and they mostly contain the same problems. Nobody publishes how much the same, which leaves readers doing avoidable work: finish one sheet, start the next, and discover forty problems in that you have already done most of it.

Every sheet on this site lives in one database, so that question has an answer.

Read the last figure first. Those 50 problems are what the sheet authors independently agree on, which makes them the highest-value problems on this site — and the ones to do before anything else, whichever sheet you eventually commit to.

How much any two sheets share

Sheet A	Sheet B	Shared	Share of the smaller sheet
NeetCode 150	LeetCode Top Interview 150	77	51%
NeetCode 150	Blind 75	74	99%
Blind 75	LeetCode Top Interview 150	50	67%

The consensus problems

Reading those numbers

The duplication figure is the interesting one. The sheets are not competing curricula — they are the same curriculum with different amounts of padding around it. Which means:

• Finishing two sheets is not twice the work of one. Once you have done the first, the second is mostly a review pass with a handful of genuinely new problems.
• The consensus problems are the signal. When five authors working independently all include a problem, that is about as strong a signal as this domain produces. Those problems come first, always.
• A problem in exactly one sheet is a judgement call, not a requirement. Some are excellent and underrated. Some are that author's personal favourite. Do them after the consensus set, not before.

Why the course is not organised as a sheet

A sheet tells you what to solve. It cannot tell you how to recognise the pattern in a problem you have not seen, and recognition is the entire skill an interview tests. That is why this course is organised by pattern, with the sheets attached to it as practice rather than the reverse.

Concretely: after LC 3, LC 209, LC 424 and LC 76, a sheet has taught you four solutions. The Sliding Window page tries to teach you the cue that fires on the fifth problem too — that "contiguous" plus "longest or shortest satisfying a monotonic condition" means a window, and that a negative number in the array means it does not.

Both matter. Do the sheets. Read the patterns first.

Where each sheet's sections land in this course

Sheet section	Phase here
Arrays & Hashing · Array / String · Hashmap	03 Core Data Structures · 05 Array and String Patterns
Two Pointers · Sliding Window	05 Array and String Patterns
Stack · Monotonic Stack	03 Core Data Structures · 05 Array and String Patterns
Binary Search	04 Sorting and Searching · 06 Search and Selection
Linked List	03 Core Data Structures · 08 Linked List Patterns
Trees · Binary Tree BFS · Binary Search Tree	03 Core Data Structures · 09 Tree Patterns
Tries	03 Core Data Structures · 05 Trie Patterns
Heap / Priority Queue	03 Core Data Structures · 06 Search and Selection
Backtracking	11 Recursion and Backtracking
Graphs · Graph BFS	03 Graph Representations · 10 Graph Patterns
Advanced Graphs	16 Advanced Graph Algorithms
1-D and 2-D Dynamic Programming	12 Dynamic Programming
Greedy · Intervals	07 Intervals and Greedy
Math & Geometry · Bit Manipulation	13 Bit Manipulation and Math
Divide & Conquer	11 Recursion and Backtracking
Matrix	05 Matrix and Grid Manipulation

Striver's sheets are indexed by step rather than by problem, and several of their problems live on GeeksforGeeks rather than LeetCode. Those two are therefore mapped step-to-phase rather than problem-to-problem, and their tracker pages say so rather than pretending otherwise.

Self-check

quizCheck yourself

1. You finish NeetCode 150 and start Blind 75. What should you expect?

   AMostly review, with a handful of genuinely new problemsBEntirely new problemsCThe same problems in a different order with no new onesDTwice the work
   Show answer

   A — Mostly review, with a handful of genuinely new problems — The sheets are the same curriculum with different padding, so a second sheet is largely a review pass.

2. A problem appears in exactly one sheet. How should you treat it?

   AA requirementBA judgement call to do after the consensus setCIgnore foreverDDo it first
   Show answer

   B — A judgement call to do after the consensus set — Some are excellent, some are one author's favourite. Consensus problems, in three or more sheets, come first.

3. Why is the course organised by pattern instead of as a sheet?

   ASheets are paidBSheets are inaccurateCA sheet says what to solve; a pattern teaches the cue that recognises problems you have not seenDPatterns are shorter
   Show answer

   C — A sheet says what to solve; a pattern teaches the cue that recognises problems you have not seen — Recognition is the skill interviews test. Sheets are attached as practice, not the other way round.