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Articles by AmitDiwan
Page 279 of 840
JavaScript Program to Find element at given index after a number of rotations
When working with arrays in JavaScript, we often need to find elements after rotating the array. A rotation shifts all elements in a specific direction. This program demonstrates how to efficiently find an element at a given index after performing a number of right rotations without actually rotating the array. Understanding Array Rotations A right rotation shifts all elements one position to the right, with the last element moving to the first position. For example, rotating [1, 2, 3, 4, 5] right by 2 positions gives [4, 5, 1, 2, 3]. ...
Read MoreJavaScript program to find if there is a subarray with 0 sum
A subarray with a sum of 0 is a sequence of contiguous elements within an array where the sum of all elements in that sequence equals zero. Identifying such subarrays is a common problem in data analysis and coding challenges. The prefix sum technique efficiently solves this problem. In this article we will find if there is a subarray with 0 sum using JavaScript. The key insight is to use prefix sums (cumulative sums) along with a data structure to track previously seen sums: Continuously calculate the prefix sum while traversing the array ...
Read MoreJavaScript Program to Find k maximum elements of array in original order
We will be using the JavaScript array sort method and slicing technique to find the k maximum elements of an array in their original order. Firstly, we sort the array in descending order, and then slice it from the beginning to the kth index to obtain the k maximum elements. By preserving the original order of the elements, the significance and context of the data remains intact, making it easier for us to analyze and interpret the results. Approach The approach to find k maximum elements of an array in original order can be described as follows − ...
Read MoreJavaScript program to find maximum element of each row in a matrix
In JavaScript, the 2D matrix manipulation involves working with arrays of arrays, often to perform operations on rows or columns. In this example, we focus on finding the maximum value in each row of a matrix. Two methods are demonstrated: using nested loops for step-by-step iteration, and using map() with Math.max() for a more concise, functional approach. Both methods return an array of the maximum values from each row, but the map() approach is more efficient and modern. Different Approaches Following are the different approaches to finding maximum element of each row in a matrix − ...
Read MoreJavaScript Program to Find Maximum number of 0s placed consecutively at the start and end in any rotation of a Binary String
We will be writing a JavaScript program to find the maximum number of zeros placed consecutively at the start and end of any rotation of a binary string. Our program will take a binary string as input and return the maximum number of zeros that can appear consecutively when considering all possible rotations. The key insight is that we need to check all rotations of the binary string and count consecutive zeros at both the beginning and end of each rotation, then find the maximum total count. Approach To find the maximum number of zeros placed consecutively ...
Read MoreJavaScript Program to Find maximum value of Sum( i*arr[i]) with only rotations on given array allowed
In JavaScript, we need to find the maximum value of Sum(i*arr[i]) by rotating an array. This problem can be solved efficiently using a mathematical approach that avoids checking all possible rotations. Problem Understanding Given an array, we can rotate it left or right. For each rotation, we calculate the sum of (index × element). Our goal is to find the maximum possible sum across all rotations. For example, with array [1, 20, 2, 10]: Original: (0×1) + (1×20) + (2×2) + (3×10) = 54 Rotate 1: (0×20) + (1×2) + (2×10) + (3×1) = 25 Rotate ...
Read MoreJavaScript Program to Find median in row wise sorted matrix
We will be describing the process of finding the median in a row-wise sorted matrix using JavaScript. First, we will traverse the matrix to gather all the elements into a single array. Then, we will sort the array to find the middle value, which will be our median. In case of an even number of elements, the median will be the average of the two middle values. Approach 1: Simple Array Concatenation Method Given a row-wise sorted matrix, the median can be found by the following approach − Combine all rows into a ...
Read MoreJavaScript Program to Find Mth element after K Right Rotations of an Array
We are writing a JavaScript program to find the mth element after k right rotations of an array. Instead of actually rotating the array, we can calculate the final position mathematically for optimal performance. Understanding Right Rotations In a right rotation, elements move to the right, and the last element wraps around to the first position. For example, rotating [1, 2, 3, 4, 5] right by 2 positions gives [4, 5, 1, 2, 3]. Mathematical Approach The key insight is that we don't need to perform actual rotations. We can calculate where the mth element will ...
Read MoreJavaScript Program to Find Simple Interest
To find simple interest in JavaScript, we calculate the product of principal amount, rate of interest (%), and time period. Simple interest is a quick and easy method to find the interest charge or extra amount paid by a borrower to a lender on a certain amount of principal within a time period. In this article, we are given data for principal, rate, and time. Our task is to write a JavaScript program to find simple interest. Users should be familiar with the formula to calculate simple interest, arithmetic operators in JavaScript, and JavaScript functions. Formula ...
Read MoreJavaScript Program to Find the Longest Bitonic Subsequence | DP-15
We will be finding the longest bitonic subsequence in an array using dynamic programming. A bitonic subsequence is a sequence which is first increasing, then decreasing. To find the longest bitonic subsequence, we will use a two-step approach: first find the longest increasing subsequence ending at each position, then find the longest decreasing subsequence starting from each position. What is a Bitonic Subsequence? A bitonic subsequence has two parts: Increasing part: Elements are in ascending order Decreasing part: Elements are in descending order For example, in [1, ...
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