Greedy Interval Scheduling When selecting the maximum number of non-overlapping events from a given set, a greedy strategy based on finish times yields an optimal solution. Sorting intervals by their end points ensures that each selected event leaves the maximum possible remaining time for subsequen...
Quicksort Quicksort uses a divide-and-conquer approach by selecting a pivot element. let dataset = [1, 2, 5, 6, 3, 1, 4]; function quickSort(data) { if (data.length < 2) { return data; } let pivotIdx = Math.floor(data.length / 2); let pivotValue = data.splice(pivotIdx, 1)[0]; let smaller = []; le...
In standard 0/1 knapsack problems, the objective is often to determine the number of ways to fill a specific capacity by adding items. However, challlenges arise when we need to compute the number of valid combinations after excluding a specific item from an already calculated set. Let $F[j]$ repres...
Sorting Algorithms Bubble Sort A simple comparison-based algorithm that repeatedly steps through the list, compares adjacent elements, and swaps them if they are in the wrong order. function bubbleSort(sequence) { const length = sequence.length; for (let pass = 0; pass < length - 1; pass++) { for...
Efficient computation of $a^b \bmod m$ utilizes the binary representation of the exponent $b$. By expressing $b$ as $\sum_{i=0}^{k} c_i \cdot 2^i$ where $c_i \in {0,1}$, the power decomposes into a product of squared terms: $a^b = \prod_{i=0}^{k} (a^{2^i})^{c_i}$. The algorithm iterates through each...
Introduction to Data Structures A data structure fundamentally consists of two components: data and structure. Data encompasses all information processed by computers—numeric values, user records (names, ages, profiles), or multimedia content (text, images, videos). Structure defines how this data i...
ZigZag Conversion Transforming a string into a zigzag layout across a specified number of rows can be efficiently simulated. By iteraitng through each character and distributing it across a collection of buffers, we track the current row index. The traversal direction reverses automatically whenever...
Handling Massive Datasets Identifying Missing Integers in a 4-Billion-Element File with 1GB Memory The range of a 32-bit unsigned integer spans 0 to 4,294,967,295. A file containing 4 billion such integers guarantees some numbers are missing. To find all missing values using 1GB of RAM, construct a...
232. Implementing Queue Using Stacks Implement a queue using stacks with the following operations: push(x) -- Insert an element at the back of the queue. pop() -- Remove and return the element from the front of the queue. peek() -- Return the element at the front of the queue without removing it. em...
Merging Overlapping Intervals Given an array intervals where each element is a pair [start, end], merge all overlapping entervals and return a list of non-overlapping intervals that cover all input intervals. Example 1: Input: [[1,3],[2,6],[8,10],[15,18]] Output: [[1,6],[8,10],[15,18]] Explanation:...