Counting Employees Meeting Target Hours This problem requires counting employees whose work hours meet or exceed a target value. A simple linear scan suffices. class Solution { public: int numberOfEmployeesWhoMetTarget(vector<int>& hours, int target) { int count = 0; for (int h : hours) {...
In Qt, each interaction between a user and a widget is considered an event, such as clicking a button or closing a window. These events emit signals, like a button-click signal or a window-close signal. Widgets in Qt can receive multiple signals and respond with specific actions, known as slots, whi...
1 Reference Concepts 1.0 Fundamentals References must be initialized to a varible upon declaration. References can only bind to variables, not expressions or constants. 1.1 Variable References int a = 0; int& ref = a; // ref is of type int& ref becomes an alias for a; operations on ref direc...
Understanding C++ Const and Mutable Modifiers In C++, the const keyword is used to declare constants or immutable values. It can be applied to variables, pointers, function parameters, member functions, and more. Using const enhances code safety and readability by preventing accidental modifications...
Understanding Problem Types in Dynamic Programming Dynamic programming problems often involve defining states and transitioning between them. Common types include: Knapsack Problems Linear DP Interval DP State Compression DP Tree DP Counting Problems Digit-based DP State Compression Memorized Search...
This article explores different approaches to finding the longest substring within a given string that contains no repeating characters. We'll examine implementations using C++ and illustrate the underlying logic. Sliding Window with unordered\_set The first approach utilizes a sliding window techni...
This article covers two classic string manipulation problems that demonstrate the power of in-place operations and the three-step reverse technique. We'll also introduce the KMP algorithm for pattern matching. 151. Reverse Words in a String String manipulation in C++ offers a significant advantage o...
Given a list of scheduled time intervals with in a 24-hour period, the goal is to identify and output the time ranges that are not covered by any of the provided intervals. Input Format The first line contains an integer N, rerpesenting the number of schedulde intervals. The following N lines each c...
Value categories in C++ dictate how expressions interact with memory and how the compiler handles assignments and functon calls. Understanding the distinction between lvalues and rvalues is fundamental to mastering modern C++ resource management and template metaprogramming. Lvalues and Rvalues An l...
Encapsulation combines data and the methods that operate on that data into a single unit, representing real-world entities. It also enforces controlled access to these internal components. In C++, this unit is called a class. For example, we can design a Circle class to calculate its circumference....