Moving Average from Data Stream Using Queue
Calculate the moving average from a data stream using a queue with fixed window size. LeetCode 346 solution with O(1) per operation.
·2 min read · #dsa#queues#beginner
#beginner
20 posts · page 1 of 1
DSA Interview Checklist: 75 Must-Know Problems
The complete DSA interview checklist — 75 essential problems organized by pattern, study schedules for 4, 8, and 12 weeks, a pattern recognition framework, and what interviewers actually look for.
·16 min read · #dsa#interviews#beginner
Queues and Deques: FIFO, Double-Ended, and Circular
Master queue variants — simple queue, deque, circular queue, and priority queue. Implementations in Python with BFS, sliding window, and scheduling examples.
·16 min read · #dsa#queues#beginner
Recursion to Iteration: Converting Recursive Code
Learn to convert recursive algorithms to iterative ones. Covers tail recursion, explicit stacks, iterative tree traversals, Morris traversal, and memoization as a bridge to DP.
·12 min read · #dsa#recursion#beginner
Data Engineering Interview Prep — What to Expect and How to Win
Prepare for data engineering interviews: SQL deep dives, Python coding, system design, data modeling, behavioral questions, and take-home project tips.
·12 min read · #data-engineering#interviews#career
Rust Lifetimes Explained Simply with Examples
Learn Rust lifetimes from scratch with clear visual examples, common patterns, and practical rules that make lifetime annotations easy to understand.
·9 min read · #rust#lifetimes#borrowing
AWS Elastic Beanstalk Tutorial: PaaS on AWS Without the Yak Shaving
Deploy web apps fast with Elastic Beanstalk. Learn environments, platforms, deployment policies, configuration via .ebextensions, and when to graduate to ECS or EKS.
·5 min read · #aws#elastic-beanstalk#paas
C++ CMake Tutorial: Build Your First Project
Learn modern CMake for C++ — targets, properties, and dependencies — and configure a small project that compiles cleanly across platforms.
·4 min read · #cpp#cmake#tooling
C++ Control Flow: if, for, while, switch
Master C++ control flow with if-else, for and range-for loops, while, do-while, switch, and the modern init-statement syntax for conditions.
·5 min read · #cpp#control-flow#beginner
Install C++ and Compile Your First Program
Set up a modern C++ toolchain on macOS, Linux, or Windows, then compile and run your first program with g++ or clang++ from the command line.
·4 min read · #cpp#setup#beginner
C++ Functions, References, and Pass-By-Value
Write C++ functions that pass data correctly: by value, by reference, by const reference, with overloading, default arguments, and clear ownership.
·5 min read · #cpp#functions#beginner
C++ Variables and Fundamental Types
Understand C++ fundamental types, fixed-width integers, floating point, char, bool, const, and how initialization actually works in modern C++.
·5 min read · #cpp#types#beginner
Heap and Priority Queue: The Data Structure Behind Top-K
Learn how heaps power priority queues, why heapq runs push and pop in O(log n), and how to solve classic Top-K and merge problems in Python.
·6 min read · #dsa#heap#beginner
Best Time to Buy and Sell Stock — One-Pass Min Tracker
Walk through Best Time to Buy and Sell Stock. We go from the quadratic brute force to a clean one-pass solution tracking the running minimum.
·5 min read · #dsa#leetcode#arrays
Two Sum — From Brute Force to O(n) Hash Map
A complete walkthrough of the Two Sum problem. We move from the obvious nested loop to a single-pass hash map and dissect why it works.
·6 min read · #dsa#leetcode#hashing
Tries: The Data Structure Behind Autocomplete
A practical introduction to tries: node structure, insert, search, prefix queries, memory tradeoffs, and classic interview problems like word search.
·6 min read · #dsa#trie#beginner
Java Classes and Objects: OOP From Scratch
Design Java classes that hold state and behavior cleanly. Constructors, encapsulation, static vs instance, records, and the equals plus hashCode contract.
·5 min read · #java#oop#beginner
Java Control Flow: if, for, while, switch
Every branching and looping construct in modern Java, including switch expressions and pattern matching, with examples that mirror real code.
·5 min read · #java#control-flow#beginner
Install Java and Write Your First Program
Install a modern JDK, verify the toolchain, and ship your first Java program from the command line without an IDE doing the magic for you.
·4 min read · #java#setup#beginner
Java Variables and Primitive Types
Master Java primitives, reference types, literals, and casting. Know exactly what each type costs and where overflow and precision will bite you.
·5 min read · #java#types#beginner