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Master the Exact Sheets Companies Hire From
Choose your targeted track with progressive Socratic AI support baked into every single problem.
Blind 75 Master Sheet
The gold standard 75 problems that cover 90% of interview patterns in Arrays, Graphs, DP & Trees.
Learn Computer Science & DSA from First Principles
Step-by-step interactive lessons with live code execution, animated pointer diagrams, predict-the-output checkpoints, and automated progressive hints.
Core DSA MasterclassFAANG Ready
Master algorithmic intuition from scratch with step-by-step memory pointer playback and Socratic questioning.
Arrays & Memory Architecture
Contiguous RAMconst prefixSum = (arr) => arr.map((sum => v => sum += v)(0));Two Pointers & In-Place Traversal
O(1) Spacelet left = 0, right = arr.length - 1; while (left < right) ...Sliding Window & Substring Bounds
Subarraysfor (let r = 0; r < n; r++) { count.set(s[r], ...); while (invalid) ... }Binary Search on Value Spaces
O(log N)let mid = left + Math.floor((right - left) / 2);What is the time complexity of bisect_left() / lower_bound() on a sorted array of N elements?
Test your algorithmic intuition in real-time. Click an answer below to inspect the Socratic reasoning.
One Platform. Every Tool You Need.
From your first Two Sum to a Google mock interview — GuruCode has you covered at every stage.
Socratic AI Mentor
4-tier progressive hints that guide your thinking without spoiling the answer. Like having a FAANG staff engineer next to you.
1v1 Code Battle Arena
Race against live coders in real-time 15-minute duels. Win ELO, climb the leaderboard, and prove your speed.
Live Hands-Free Mock Interviewer
Two-way voice AI that talks back like a real FAANG interviewer. Listen, speak hands-free, and receive a comprehensive rubric scorecard.
AI Video Explainer
Paste code → get a narrated lecture video with animated pointer movements, line highlights, and memory diagrams in multiple languages.
ATS Resume Scanner
AI scans your resume against Amazon, Google & TCS interview matrices and tells you exactly what DSA problems you are missing.
College Classroom Hub
Professors create private batches with invite codes. Assign problem sets, track class mastery, and evaluate submissions with AI.
Code & Pointer Visualizer
PythonTutor-style step-by-step playback. Watch two-pointers move, variables update in stack frames, and array elements swap live.
Smart Spaced-Repetition Hub
Anki for algorithms. Review Sliding Window, Monotonic Stack & DP patterns at scientifically-backed 1, 3, 7, and 14-day intervals.
Big-O Runtime & Space Analyzer
One-click asymptotic spectrum gauge. Detects nested quadratic bottlenecks and prescribes FAANG optimization strategies.
XP Perks & Streak Freeze Shop
Spend earned coding XP on Streak Shields, Glowing Avatar Auras, and verified coder titles like "10x Engineer" and "FAANG Bound".
The Socratic Difference
See how Guru guides you step-by-step on #1 Two Sum — without giving away the answer.
Hint #1: Gentle Nudge
Think about what information you need to remember while iterating through `nums` so you don't need a nested O(n²) loop.
Popular Coding Challenges
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