Freaks City

Selection Sort Core Concept During each iteration, the element with the smallest (or largest) key is identified from the unsorted portion and appended to the sorted sub-sequence. Implementation void selectionSort(int data[], int size) { for (int current = 0; current < size - 1; ++current) { int smallestIdx = current; for ...

Algorithm Efficiency Algorithm efficiency is measured in two dimensions: time efficiency and space efficiency. Big O Notation Big O notation mathematically describes the asymptotic behavior of a function. It provides an estimation of an algorithm's growth rate. The rules for deriving Big O are: Replace all additive constants in the runtime fun ...

Binary search operates with O(log n) time complexity on a sorted array of n elements. The algorithm repeatedly divides the search interval in half, achieving logarithmic performance. Algorithm Fundamentals Binary search, also known as half-interval search, is an efficient algorithm for locating a target value within a sorted sequence. It compar ...

Basic Syntax First Program The class name must match the filename for a public class. public class GreetingApp { public static void main(String[] args) { System.out.println("Hello world"); } } Compile via terminal: javac GreetingApp.java Execute: java GreetingApp Comments Single-line: // comment Multi-line: /* comment ...

What is Redis Redis is a high‑performance, in‑memory key‑value database that also supports optional data persistence. It is open‑source and written in C, widely used both as a cache and as a primary datastore for specialised scenarios. Why Redis Is So Fast In‑memory storage – data is served directly from RAM, avoiding disk I/O for most operati ...

Fundamentals of Stack and Queue Data StructuresStack Data StructureConceptA stack is a specialized linear data structure that permits insertion and deletion operations only at one fixed end, known as the top. The opposite end is called the bottom. Elements in a stack follow the Last-In-First-Out (LIFO) principle. The insertion operation is call ...

A stack is a linear collection that restricts element access to a single endpoint, commonly referred to as the top. This constraint enforces a Last-In-First-Out (LIFO) ordering, meaning the most recently added item is always the first to be removed. The two fundamental operations are push (insertion at the top) and pop (removal from the top). A ...

Python sets utilize a hash table implementation to store unique elements. The deduplication mechanism operates through a two-step verification process involving the __hash__ and __eq__ methods of the stored objects. Initially, the set evaluates the hash value of the incoming object. If this hash does not exist in the current hash table, the obj ...

Node Class Definition The following ListNode class serves as the foundation for all examples in this article: import java.util.Arrays; public class ListNode { int data; ListNode next = null; public ListNode(int data) { this.data = data; } public String toString(ListNode node) { int[] values = new int[calcu ...

HashMap vs Hashtable Key Differences Thread Safety: Hashtable is synchronized, while HashMap is not Null Values: HashMap allows one null key and multiple null values; Hashtable prohibits null keys and values Performance: HashMap generally performs better in single-threaded environments due to lack of synchronization overhead HashMap ...