Coding Interview Questions
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IBM Online Assessment: Make Network Connected - Union Find
Solve IBM's 'Make Network Connected' OA: use Union-Find or DFS to count components, check m<n-1, compute minimal rewirings, and get implementation tips.
Implement k-Fold Cross-Validation From Scratch — Uber
Implement k-fold, stratified, and time-series CV from scratch for ML evaluation. Includes split contracts, reproducibility, and aggregate metric. Read on to prepare.
Integer Overflow Interview Question - Salesforce Prep
Prepare for an Integer Overflow interview question at Salesforce: understand causes, C/C++ vs Java behavior, detection tools, and prevention techniques.
Intuit Coding Question: Sum of Palindrome Modification Costs
Sum minimum single-character changes to make every substring of a DNA string a palindrome. Learn two-pointer and combinatorics approaches for Intuit coding prep.
Intuit CS Foundation: Database Pagination Techniques
Master pagination in MySQL and DynamoDB: LIMIT/OFFSET, ROW_NUMBER, keyset (seek) and LastEvaluatedKey. See performance trade-offs, optimizations, and examples.
LinkedIn ML: Large-Scale Streaming Mean & Variance
Compute population mean and variance in one pass over massive float streams. Includes mergeable, numerically stable summaries for distributed ML systems — try it.
LinkedIn T9 Coding Question: Phone-Keyboard Word Match
T9 phone-keypad matching: return dictionary words matching a digit string per position (case-insensitive). Includes precompute index and query API design.
LRU Cache Implementation - Oracle Coding Interview
Implement an O(1) LRU cache with get/put, fixed-capacity eviction, and Java follow-ups (collections choices, thread-safety, GC, equals/hashCode). Read tips.
Lyft Coding Interview: Persistent Read Wrapper (read4)
Build a persistent read wrapper using read4 that preserves leftover characters across successive read() calls. Practice stateful iterator design—solve it now.
Meta Coding Interview: Max-Unique-Characters Subset (Bitmask)
Solve a Meta coding question: fix word_to_mask and implement max_unique_chars_subset using bitmasks and backtracking to maximize distinct digits/letters. Try it now.
Meta Coding Question: Indent Root-to-Leaf Paths by Column
Print root-to-leaf paths with per-path column shifts and indentation. See DFS approach, implementation tips, and complexity notes — try this Meta coding question now.
Meta Online Coding Assessment: Simplify Unix File Path
Simplify Unix Path (Meta): stack-based parsing to handle '.', '..', and repeated slashes. Steps, complexity, edge-case tips — code it now. Try examples & tests.
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