Learnitweb

Author: Editorial Team

  • Bloom Filter

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    Introduction to Bloom Filter A Bloom Filter is a probabilistic data structure used to test whether an element is possibly in a set or definitely not in a set. Unlike traditional data structures such as arrays, lists, or hash sets, Bloom Filters do not store the actual elements. Instead, they use a bit array and…

  • CSS Box Model

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    In CSS, every HTML element is considered as a rectangular box. The CSS Box Model is a fundamental concept that defines how these boxes are structured, how they occupy space, and how their dimensions are calculated. Understanding the box model is essential for layout, spacing, alignment, and designing responsive web pages. Components of the CSS…

  • LinkedHashMap

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    Introduction to LinkedHashMap LinkedHashMap is a class in Java’s Collections Framework that combines the power of a HashMap with a linked list to maintain the insertion order or access order of entries. It belongs to the package: and was introduced in Java 1.4. A LinkedHashMap is very useful when you want to store key-value pairs…

  • Key web performance metrics

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    Introduction When users visit a website, their experience is determined by how quickly the page becomes visible, usable, and stable. Traditional metrics like total page load time or server response time only measure technical performance, but they don’t reflect what the user sees and feels during loading. To address this, Google and other web performance…

  • Query Execution Plan in Oracle

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    1. What Is a Query Execution Plan? A Query Execution Plan (often called EXPLAIN PLAN) in Oracle shows the sequence of operations that the Oracle optimizer chooses to execute a SQL statement.It describes how Oracle will access the data — which indexes will be used, which tables will be joined, and in what order. Think…

  • First Bad Version

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    Problem Statement You are the product manager, and your team is developing a new product.Unfortunately, one of the versions released is bad, and all the versions after it are also bad. You have a function isBadVersion(version) that returns: Your task is to find the first bad version among n versions, using the minimum number of…

  • Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree

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    Problem Statement You are given the root of a binary tree and an integer array arr.You need to determine whether the array arr represents a valid path from the root of the tree to any leaf node. A valid path means: If such a path exists, return true; otherwise, return false. Example Input: Output: Explanation:There…

  • Binary Tree Maximum Path Sum

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    Problem Statement You are given the root of a binary tree.A path in a tree is a sequence of nodes where each pair of adjacent nodes in the sequence has a parent-child relationship. A path does not necessarily need to pass through the root, and it can start and end at any node.The path sum…

  • First Unique Number

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    Problem StatementYou are given a queue of numbers, and you need to find the first unique number in the queue at any given time.You must also support two operations: The goal is to design an efficient data structure to handle both operations quickly. ExampleInput: Output: Understanding the Problem We need to track numbers in the…

  • Maximal Square

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    Problem StatementYou are given a 2D binary matrix filled with ‘0’s and ‘1’s.Your task is to find the largest square containing only ‘1’s and return its area. ExampleInput: Output:4Explanation: The largest square containing only ‘1’s has a side length of 2, so its area = 2 × 2 = 4. Understanding the Problem We have…