Blind 75 LeetCode Problems: Complete Interview Guide 2025
Master the most efficient curated list of 75 LeetCode problems to crack coding interviews at Google, Amazon, Microsoft, Meta, and other top tech companies. This comprehensive guide covers all problems organized by category with patterns, solutions, and a strategic study plan.
What is the Blind 75?
The Blind 75 is a curated list of 75 essential LeetCode problems created by a Facebook engineer (username "Blind" on the Blind app) to help software engineers prepare efficiently for technical coding interviews. Unlike practicing hundreds of random problems, the Blind 75 focuses on the most important patterns that appear repeatedly in FAANG interviews.
Why the Blind 75 is the Gold Standard
- Created by industry experts with real interview experience at top companies
- 80% of FAANG interview questions are variations of these 75 problems
- Efficient coverage of all major data structures and algorithm patterns
- Battle-tested by thousands of successful candidates at Google, Amazon, Meta
Quick Stats
Why Choose Blind 75 Over Other Lists?
With thousands of problems on LeetCode, it's overwhelming to know where to start. Here's why the Blind 75 stands out from other curated lists like NeetCode 150, Grind 75, or LeetCode Top 100:
1. Optimal Problem-to-Pattern Ratio
Just 75 problems cover 95% of interview patterns. Other lists have 150+ problems with diminishing returns. The Blind 75 maximizes learning efficiency - every problem teaches you a crucial pattern without redundancy.
2. Industry-Validated Selection
These aren't randomly chosen problems. Each one has appeared multiple times in actual interviews at Google, Amazon, Microsoft, Meta, Apple, and Netflix. The creator analyzed thousands of interview experiences shared on Blind.
3. Time-Efficient Preparation
Complete all 75 problems in 8-12 weeks with focused practice. Other comprehensive lists require 4-6 months. Perfect for candidates with limited time before interviews or those switching careers into software engineering.
4. Progressive Difficulty Curve
Problems are carefully ordered to build your skills progressively. You'll start with foundational array and string manipulations, then advance to complex tree, graph, and DP problems. This structured learning path prevents burnout and builds confidence.
ā” Real Success Stories
"I solved all Blind 75 problems in 10 weeks and got offers from Google L4, Amazon SDE II, and Meta E4. The pattern recognition I gained was invaluable - I could solve 80% of my interview problems using variations of Blind 75 patterns." - Anonymous, Blind community
Thousands of candidates credit the Blind 75 for their success. The focused approach helps you develop problem-solving intuition rather than just memorizing solutions.
š All 18 Problem Categories in Blind 75
The Blind 75 problems are organized into 18 categories covering all major data structures and algorithmic patterns. Here's the complete breakdown:
Array & Hashing
9 problemsDifficulty: Easy-Medium
Two Pointers
3 problemsDifficulty: Medium
Sliding Window
4 problemsDifficulty: Medium
Stack
2 problemsDifficulty: Easy-Medium
Binary Search
4 problemsDifficulty: Medium
Linked List
6 problemsDifficulty: Easy-Medium
Trees
11 problemsDifficulty: Easy-Hard
Tries
3 problemsDifficulty: Medium-Hard
Heap / Priority Queue
4 problemsDifficulty: Medium-Hard
Backtracking
5 problemsDifficulty: Medium
Graphs
9 problemsDifficulty: Medium-Hard
1-D Dynamic Programming
10 problemsDifficulty: Easy-Hard
2-D Dynamic Programming
4 problemsDifficulty: Medium-Hard
Greedy
3 problemsDifficulty: Medium
Intervals
4 problemsDifficulty: Medium
Math & Geometry
3 problemsDifficulty: Medium
Bit Manipulation
5 problemsDifficulty: Easy-Medium
Strings
4 problemsDifficulty: Medium
šÆ Category Learning Order
Start with Arrays & Hashing and Two Pointers to build fundamentals. Progress to Trees and Graphs for intermediate patterns. Save Dynamic Programming and Advanced Graph algorithms for later after you've built solid problem-solving intuition.
8-Week Blind 75 Study Plan
Follow this structured 8-week plan to master all 75 problems. Dedicate 1-2 hours daily and you'll be interview-ready in 2 months.
Week 1-2: Arrays & Foundations
~25 problemsFocus Areas: Array & Hashing, Two Pointers, Sliding Window
Goal: Build pattern recognition for O(n) optimizations, master hash maps and two-pointer technique
š” Pro Tip: Focus on understanding WHY solutions work, not just memorizing code
Week 3: Data Structures
~12 problemsFocus Areas: Stack, Binary Search, Linked List
Goal: Master pointer manipulation, stack-based problems, and binary search variations
š” Pro Tip: Draw diagrams for linked list problems, practice implementing stack from scratch
Week 4-5: Trees & Graphs
~23 problemsFocus Areas: Binary Trees, BST, Tries, Graph Traversal
Goal: Master DFS, BFS, recursive thinking, and graph algorithms
š” Pro Tip: Understand recursion deeply - most tree problems are variations of DFS/BFS
Week 6: Dynamic Programming
~14 problemsFocus Areas: 1-D DP, 2-D DP patterns
Goal: Recognize overlapping subproblems, build DP state transition logic
š” Pro Tip: Start with recursive solution + memoization, then convert to bottom-up DP
Week 7: Advanced Topics
~16 problemsFocus Areas: Heap/Priority Queue, Backtracking, Greedy, Intervals
Goal: Complete remaining patterns, understand when to use each approach
š” Pro Tip: Backtracking is DFS with state restoration - recognize the pattern
Week 8: Review & Mock Interviews
Revisit all 75 problemsFocus Areas: Revision, timed practice, mock interviews
Goal: Solve problems in 25-30 minutes, explain solutions clearly
š” Pro Tip: Practice on whiteboard/paper, do mock interviews with peers or Pramp
ā Daily Practice Routine
- 15 min: Review previous day's problems
- 40 min: Solve 1-2 new problems (attempt before looking at solutions)
- 20 min: Read and understand optimal solutions
- 15 min: Implement the pattern from scratch
- 10 min: Document key learnings and patterns
šÆ 10 Expert Tips to Master Blind 75
Understand Patterns, Don't Memorize Solutions
Focus on WHY a solution works. Recognize that 'Two Sum' teaches you hash map lookups, not just how to solve that one problem. This pattern applies to hundreds of variants.
Solve Without Looking at Solutions First
Spend 30-45 minutes attempting each problem before checking solutions. Struggling builds problem-solving muscles. It's okay to not solve it perfectly - the learning happens in the attempt.
Master Time & Space Complexity Analysis
For every solution, identify the Big O complexity. In interviews, you'll need to explain why your solution is O(n) or O(log n). Practice analyzing complexity until it becomes second nature.
Revisit Problems Multiple Times
Use spaced repetition: solve each problem 3 times with gaps (Day 1, Day 3, Day 7). This reinforces patterns and improves retention better than solving once.
Code Without IDE Help Initially
Practice on paper or basic text editors without autocomplete. Most technical interviews use platforms like CoderPad with minimal IDE features. Build muscle memory for syntax.
Explain Your Thinking Out Loud
Practice explaining your approach as you code, even when alone. Interviewers want to understand your thought process. Saying 'I'll use a hash map to store...' shows structured thinking.
Start with Brute Force, Then Optimize
Always state the brute force O(nĀ²) solution first, then optimize to O(n) or O(n log n). Interviewers appreciate seeing your optimization process.
Test With Edge Cases
Always test with: empty input, single element, duplicates, negative numbers, maximum constraints. Finding bugs yourself is better than the interviewer pointing them out.
Join Study Groups or Find Accountability Partners
Discuss solutions with peers. Teaching others solidifies your understanding. Use platforms like Discord, Reddit's r/leetcode, or form study groups with friends preparing for interviews.
Track Your Progress and Patterns
Maintain a spreadsheet with: problem name, difficulty, date solved, patterns used, mistakes made. Review this weekly to identify weak areas and track improvement.
š Sample Problems from Blind 75
Here are a few example problems from different categories to give you a taste of what to expect:
Two Sum
Given an array, find two indices that sum to a target. Classic hash map pattern.
Longest Substring Without Repeating Characters
Find the longest substring without duplicate characters. Essential sliding window problem.
Invert Binary Tree
Swap left and right children recursively. Fundamental tree manipulation.
Climbing Stairs
Count ways to reach the top. Classic DP introduction problem.
Course Schedule
Detect cycles in directed graph. Important for dependency resolution problems.
Access All 75 Problems
Get the complete Blind 75 list organized by category with progress tracking, difficulty filters, and LeetCode links. Track your preparation journey and never lose your place.
View Complete Blind 75 ListReady to Conquer the Blind 75? š
Start your interview preparation journey with our interactive Blind 75 tracker. Monitor your progress, access organized problem lists, and get step-by-step guidance for each category.
ā Frequently Asked Questions
1.Is Blind 75 enough to crack FAANG interviews?
Yes, for most SDE I-II roles. The Blind 75 covers 80-90% of patterns you'll encounter. However, for senior roles or specific companies (e.g., Google L5+), you may need additional system design and advanced algorithm knowledge.
2.How long does it take to complete Blind 75?
Most people complete it in 8-12 weeks with 1-2 hours daily practice. Faster completion (4-6 weeks) is possible if you have strong foundations and dedicate 3-4 hours daily. Quality over speed - understanding patterns is more important than rushing through.
3.Should I do Blind 75 or NeetCode 150?
Start with Blind 75 if you have limited time (< 3 months). It's more focused and efficient. NeetCode 150 is better if you have 4+ months and want comprehensive coverage. Many candidates do Blind 75 first, then add NeetCode problems for additional practice.
4.Can beginners start with Blind 75?
Yes, but learn basic data structures first (arrays, strings, hash maps, basic recursion). If you're completely new to coding, spend 2-3 weeks on fundamentals before jumping into Blind 75. The problems range from Easy to Hard, so you can start with easier ones.
5.Do I need LeetCode Premium for Blind 75?
No! All Blind 75 problems are free on LeetCode. A few problems (like 'Encode and Decode Strings') are premium, but you can find them on LintCode or practice alternatives. Premium is helpful for company-specific questions but not required for Blind 75.