What is the Practice Hub?

A searchable question bank of every coding interview problem in the Grokking library, stripped of lessons and coding pattern scaffolding so you can go straight to solving. Each problem has its own URL, a lean editor, and automatic grading.

Searching, filtering, and viewing problem statements is free for everyone. Running code, saving progress, and unlocking your correctness, runtime, and time-to-solve stats require a free Educative account.

How are problems tagged by company?

Tags come from aggregated interview reports and are refreshed monthly. A company tag means the problem, or a close variant, was reported in that company’s loop within the last two years.

What happens when I click Start practice?

The current filtered list becomes a practice session. Problems are served one at a time in the Coding Interview Preparation editor, and your results are written back to this list so you can see what to revisit.

Practice the exact problems top companies ask.

Search 2,800+ real coding interview problems. Filter by company, role, topic, and difficulty, then solve in a lean editor right in your browser.

2,800+Problems

312Companies

49Topics

30Roles

Nov 14Last updated

All problems

The full question bank. Search, filter, then hit Practice. Your progress shows up as you go.

2301The Two Sneaky Numbers of Digitville
Bitwise ManipulationEasy
2302Construct the Minimum Bitwise Array I
Bitwise ManipulationEasy
2303Smallest Number With All Set Bits
Bitwise ManipulationEasy
2304Bitwise OR of Even Numbers in an Array
Bitwise ManipulationEasy
2305Count Monobit Integers
Bitwise ManipulationEasy
2306Decode XORed Permutation
Bitwise ManipulationMedium
2307Maximum XOR for Each Query
Bitwise ManipulationMedium
2308Find Unique Binary String
Bitwise ManipulationMedium
2309Maximum XOR After Operations
Bitwise ManipulationMedium
2310Find The Original Array of Prefix Xor
Bitwise ManipulationMedium
2311Range Product Queries of Powers
Bitwise ManipulationMedium
2312Minimize XOR
Bitwise ManipulationMedium
2313Minimum Impossible OR
Bitwise ManipulationMedium
2314Convert a Number to Hexadecimal
Bitwise ManipulationEasy
2315Integer Replacement
Bitwise ManipulationMedium
2316Number Complement
Bitwise ManipulationEasy
2317IP to CIDR
Bitwise ManipulationMedium
2318Prime Number of Set Bits in Binary Representation
Bitwise ManipulationEasy
2319Chalkboard XOR Game
Bitwise ManipulationHard
2320Encode Number
Bitwise ManipulationMedium
2321Number of Steps to Reduce a Number to Zero
Bitwise ManipulationEasy
2322Concatenation of Consecutive Binary Numbers
Bitwise ManipulationMedium
2323Find XOR Sum of All Pairs Bitwise AND
Bitwise ManipulationHard
2324Minimum Bit Flips to Convert Number
Bitwise ManipulationEasy
2325Maximum XOR of Subsequences
Bitwise ManipulationHard
2326Longest Subsequence With Non-Zero Bitwise XOR
Bitwise ManipulationMedium
2327Minimum Numbers of Function Calls to Make Target Array
Bitwise ManipulationMedium
2328Largest Combination With Bitwise AND Greater Than Zero
Bitwise ManipulationMedium
2329Bitwise XOR of All Pairings
Bitwise ManipulationMedium
2330Apply Bitwise Operations to Make Strings Equal
Bitwise ManipulationMedium
2331Neighboring Bitwise XOR
Bitwise ManipulationMedium
2332Find a Good Subset of the Matrix
Bitwise ManipulationHard
2333Apply Operations on Array to Maximize Sum of Squares
Bitwise ManipulationHard
2334Find the XOR of Numbers Which Appear Twice
Bitwise ManipulationEasy
2335Find Subarray With Bitwise OR Closest to K
Bitwise ManipulationHard
2336Bitwise OR of Adjacent Elements
Bitwise ManipulationEasy
2337Count Triplets with Even XOR Set Bits I
Bitwise ManipulationEasy
2338Number of Bit Changes to Make Two Integers Equal
Bitwise ManipulationEasy
2339Convert Date to Binary
Bitwise ManipulationEasy
2340Construct the Minimum Bitwise Array II
Bitwise ManipulationMedium
2341Number of Unique XOR Triplets I
Bitwise ManipulationMedium
2342Number of Unique XOR Triplets II
Bitwise ManipulationMedium
2343Once Twice
Bitwise ManipulationMedium
2344XOR After Range Multiplication Queries I
Bitwise ManipulationMedium
2345Toggle Light Bulbs
Bitwise ManipulationEasy
2346Minimum Number of Flips to Reverse Binary String
Bitwise ManipulationEasy
2347Sort Integers by Binary Reflection
Bitwise ManipulationEasy
2348Minimum Operations to Make Binary Palindrome
Bitwise ManipulationMedium
2349Maximum Bitwise AND After Increment Operations
Bitwise ManipulationHard
2350Minimum Bitwise OR From Grid
Bitwise ManipulationMedium

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