Algorithms

Bit manipulation problems appear at Google, Meta, and Amazon interviews. They test low-level reasoning and often offer O(1) space solutions […]

C# is the dominant language at Microsoft, enterprise .NET shops, Unity game studios, and fintech companies running on Windows infrastructure.

A trie (prefix tree) is a tree where each node represents a character and the path from root to a

Graph problems appear in every serious technical interview. They cover a wide range of difficulty — from simple BFS/DFS traversal

Backtracking is systematic trial and error — explore a decision tree, and when you reach a dead end, undo the

Two Pointers Fundamentals Two pointers use two indices traversing an array or string to solve problems in O(n) that would

Stack and Queue Fundamentals A stack is LIFO (last-in, first-out): push adds to the top, pop removes from the top.

The Sliding Window Technique The sliding window technique optimizes brute-force O(n^2) or O(n^3) problems to O(n) by maintaining a window

Heap Fundamentals A heap is a complete binary tree satisfying the heap property: in a min-heap, every parent is smaller

Why Linked Lists Are Tested Linked lists appear in roughly 10% of coding interviews, mostly testing pointer manipulation, two-pointer techniques,

Why Binary Search Is Tested So Frequently Binary search appears in roughly 10-15% of FAANG coding interviews, both as a

What Is Dynamic Programming? Dynamic programming (DP) solves problems by breaking them into overlapping subproblems, solving each subproblem once, and

Site Reliability Engineering (SRE) and DevOps interviews mix system design, operations knowledge, and cultural questions. Google, Netflix, Uber, and most

API design questions appear in backend, platform engineering, and staff-level interviews. A poorly designed API is a permanent liability —

Object-oriented design (OOD) questions test whether you can translate real-world requirements into clean class hierarchies. Amazon, Uber, and Microsoft frequently