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C++ Lambdas: Captures, Closures and Sort Comparators
5+ hour, 18+ min ago (853+ words) Learn to read C++ lambdas, trace copied and referenced state, write a valid sort comparator, and prevent dangling-reference bugs in stored callbacks. Exam prep & CS education For a first pass through syntax, value-versus-reference capture, and broad STL use, start with…...
Heuristic Search: A* Worked Example and Exam Traps
3+ day, 7+ hour ago (541+ words) Exam prep & CS education A search problem has a state space, a start state, a goal test, and successors reached through edges or actions. Each edge can have a step cost. The accumulated cost from the start to node n…...
DFA Basics and Definitions
5+ day, 20+ hour ago (957+ words) Understand what makes a finite automaton deterministic and complete. Build one DFA for strings ending in 01, trace inputs, test acceptance, and repair a missing transition. Exam prep & CS education Use CS Fundamentals for Exams & Placements as the broader subject hub…...
SQL Query Optimization Basics: EXPLAIN and Indexes
5+ day, 20+ hour ago (1039+ words) Learn to read row flow, choose composite index order, rewrite date predicates, and compare before and after plans on a deterministic PostgreSQL fixture. Exam prep & CS education A SQL query can return exactly the right rows and still do far…...
C++ const vs constexpr vs consteval: One Worked Program
1+ week, 20+ hour ago (665+ words) See exactly what each C++ keyword guarantees. One C++20 program separates immutability, optional constant evaluation and mandatory constant evaluation. Exam prep & CS education Start with an ordinary function and a const object: Do not turn that into the rule "const…...
Functions in Python: Traced Calls, Return Values and Scope
1+ week, 4+ day ago (790+ words) Build, call and debug Python functions through traced examples. Learn how arguments, local scope and return values work, then test yourself with short exercises. Exam prep & CS education You can run short Python statements, but copying a calculation for each…...
Python String MCQs: 12 Solved Questions with Answers
1+ week, 4+ day ago (557+ words) Solve 12 published Python string questions step by step. Trace indices, slices, return types and method contracts before checking each answer. Exam prep & CS education Keep this rule sheet beside you while solving: Excludes stop; an omitted bound follows the direction…...
DSA in Python: heapq, collections and bisect for tests
1+ week, 4+ day ago (1051+ words) Learn which Python built-in fits heaps, frequency maps, queues and sorted searches, with traced outputs and the complexity details hidden tests expose. Exam prep & CS education Use heapq when you repeatedly need the smallest remaining value without sorting the full…...
JavaScript Prototypes and Inheritance: Runnable Examples
1+ week, 5+ day ago (571+ words) Understand how JavaScript finds inherited properties, shares methods, and implements constructor and class inheritance. Trace the chains, fix common mistakes, and test yourself. Exam prep & CS education JavaScript makes three ideas look more mysterious than they are: an object's hidden…...
Operator Overloading in C++: Syntax, Rules, Examples
1+ week, 5+ day ago (494+ words) Learn what C++ calls for an overloaded operator, then test addition, stream output, increment, and fraction comparison with exact values. Exam prep & CS education An overloaded operator is a function with a special name such as operator+. The compiler selects…...