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Arrays: Get minimum number of merge operations to make an array palindrome

  • You are given an array, you need to find the minimum number of merge operations to be performed to make the array as a palindrome.
  • The solution involves using two pointers, one pointing to the beginning of the array and the other pointing to the end of the array.
  • Based on the comparison of elements at the two pointers, three cases are defined along with the required steps for each case.
  • The C++ code provided demonstrates the implementation of the solution using a loop and the defined cases.

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PlanetPython

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Fabio Zadrozny: Using (or really misusing) Path.resolve() in Python

  • Python Path.resolve(), which resolves symlinks and substs on Windows could be causing bugs in certain cases.
  • If a user crafted a structure with symlink which isn't the canonical representation, resolve() will not find it.
  • In python docs, it is recommended to use Path.resolve() to walk up an arbitrary filesystem path.
  • However, it leads to incorrect parent resolutions. Instead, using os.path.normalize and os.path.abspath() will suffice.
  • Using os.path.normalize(os.path.abspath(...)) will eliminate instances of ‘..’ from the string and make it absolute.
  • A bug can occur when calls to absolute() or resolve() are made from two programs with different current working directories.
  • Path.resolve() can be useful in maping out an IDE cache where all representation of a file are considered the same.
  • Ideally, it's best to use the inode of the file as reference, since bugs can occur which result in the same file being opened under different names.
  • In case of executing an API call from another program, paths should already be absolute and normalized.
  • It is best practice to call Path(os.path.normalize(os.path.abspath(...))) on program boundaries.

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Prodevelopertutorial

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Arrays: Minimum swaps required to bring all elements less than or equal to k together

  • Given an array and a number K, find the minimum number of swaps needed to bring all the numbers less than K together.
  • The problem can be solved using the sliding window approach.
  • First, count the elements that are less than or equal to K.
  • Then, find the minimum number of elements greater than K in a window of size equal to the count.

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Prodevelopertutorial

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Arrays: Find a triplet that sum to a given value

  • The problem is to find a triplet in an unsorted array that sums up to a given value.
  • Two approaches to solve this problem are using three loops/brute force approach and an optimized approach using hashing.
  • In the brute force approach, three nested for loops are used to check for triplets that sum up to the given value.
  • In the optimized approach, a set is used to check if the remaining part of the triplet exists in the set.

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Dev

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A case study of creating configurable values

  • A case study of creating configurable values
  • The new requirement: Divide product codes into batches
  • Proposed Solution 1: Configurable solution with value passed from Admin UI
  • Proposed Solution 2: Environment variable solution to directly obtain the value

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Medium

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XRP value could increase by 60% as Gary Gensler exits SEC

  • XRP value could increase by 60% as Gary Gensler exits SEC.
  • Ripple's recent court win in the ongoing SEC case has given XRP a boost.
  • Speculation arises regarding a potential rally for XRP with Gensler's departure and Ripple's victory.
  • Technical charts and market trends hint at a possible 60% gain for XRP in the future.

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Prodevelopertutorial

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Arrays: Find whether an array is subset of another array

  • To check if arr2 is a subset of arr1, there are multiple approaches.
  • One approach is to use two loops, where for each element of arr2, check if it exists in arr1.
  • Another approach is to sort arr1 and use binary search to search each element of arr2 in arr1.

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The Flaw in Square Inheriting from Rectangle

  • The Liskov Substitution Principle states that objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.
  • In the case of the `Square` class inheriting from the `Rectangle` class, there are problems with violating the principle.
  • The issue arises when the width and height of a square can be set independently, breaking the invariant that a square must always have equal sides.
  • To address this, a redesign of the hierarchy is proposed, introducing a `Shape` base class and implementing specific behavior in each shape class.

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Dev

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The basic components of a unit test in Angular

  • Unit testing in Angular is worth it and simpler than it might seem.
  • Unit tests verify that code works correctly by testing small components in isolation.
  • Unit testing saves time and money by identifying bugs during development.
  • The file that contains unit tests in Angular is called a spec file, which is generated alongside each Angular component.
  • Jasmine is a JavaScript testing framework used to write Aungular unit tests.
  • The it global function is used to define specs (tests) and describe function is used to group related specs (suites).
  • The expect function compares actual and expected values with the help of matcher functions.
  • Setup and Teardown functions prepare and clean up the environment for test execution, helping to ensure that specs are isolated and free from interference from leftover state from other specs.
  • Jasmine provides functions to help developers with setup and teardown: beforeEach, afterEach, beforeAll, and after All.
  • Unit testing improves code quality by encouraging readable, maintainable, and reusable code, and gives developers confidence that new code additions are not breaking existing code.

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Dev

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Preserving Scroll State on Tab Change in Angular

  • Preserving scroll state on tab change is crucial for enhancing user experience in a multi-tabbed Angular application.
  • By using window.scrollY to save and retrieve scroll positions, users can pick up where they left off when navigating between tabs.
  • The solution involves saving the current scroll position before switching tabs and restoring it when the user returns to the tab.
  • Optional enhancements like debouncing and horizontal scroll preservation can be implemented for more refined scroll management.

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Dev

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Understanding Tuple Unpacking and Iteration in Python: A Beginner's Guide

  • Tuple unpacking in Python allows you to assign multiple variables from a tuple in a single line.
  • Tuple unpacking is commonly used for swapping values without a temporary variable.
  • Tuples are immutable in Python, meaning their contents cannot be changed once created.
  • Iterating over tuples allows you to access and process each element one at a time.

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Prodevelopertutorial

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Arrays: Find common element in 3 sorted arrays.

  • Given 3 sorted arrays, you need to find all the common elements in all the 3 elements.
  • The problem can be solved by finding the intersection of all the arrays.
  • Another optimized approach is to use a single loop to find the common elements.
  • The time complexity for both approaches is O(n1 + n2 + n3), where n1, n2, n3 are the sizes of the 3 arrays.

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Medium

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Transforming Word Documents to PDF in Golang: A Comprehensive Guide

  • UniDoc's UniOffice library simplifies the challenges of Word-to-PDF conversion.
  • UniOffice is a Golang library for working with Microsoft Office formats.
  • It allows developers to create, edit, and convert documents within their Go applications.
  • UniDoc, including UniOffice, provides comprehensive support for document processing in Golang.

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Medium

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New CSS Features You Should Know

  • This article covers modern CSS properties and at-rules that help solve common challenges in web development
  • The @scope rule defines a boundary within which certain styles apply. This boundary is determined by a selector
  • The @supports rule checks if a given CSS property or feature is supported by the browser. If the condition evaluates to true, the enclosed styles are applied
  • The content-visibility property tells the browser to skip the rendering of the element's contents if they're not currently visible in the viewport
  • The aspect-ratio property ensures the element maintains its proportions even if the container size changes
  • The @keyframes rule defines a series of style changes that should occur at specified points during an animation
  • The @starting-style rule helps create smooth and predictable CSS transitions. It defines the initial styles that should be applied to an element before a transition begins.
  • The offset-position property, used with offset-path, allows for complex, precise animations that go beyond simple linear movements
  • The text-wrap property adjusts line breaks for improved readability
  • The white-space-collapse property offers precise control over how whitespace is handled in text, allowing for collapsing, preserving, or other custom behaviors

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Dev

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The Latest Trends, Frameworks, and Libraries in Java (2024-2025)

  • Java 24, set to launch in March 2025, introduces performance improvements, enhanced garbage collection, and tightened security measures.
  • Cloud-native development and microservices using frameworks like Spring Boot and Quarkus offer scalability, resilience, and cost efficiency.
  • Java is increasingly used in AI and machine learning applications with libraries like Deeplearning4j and Apache Spark.
  • Reactive programming frameworks, combined with Java's virtual threads, improve real-time processing and resource efficiency.
  • Enhanced security measures, including updates to cryptography modules and secure coding practices, prioritize security and compliance.
  • The rise of low-code and no-code platforms enables rapid application development, with Java's compatibility ensuring wider participation.

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