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Series
This will series will cover the DSA questions and topics with in JavaScript important for the frontend interviews and startups.
In this article lets solve the second largest element question in javascript. Solution 1 - Find the first largest element and then find the second large class Solution { // Function returns the second largest element getSecondLargest(arr) { ...
🧩 Pattern 1: Fixed-Size Sliding Window When to recognize it Window size is given or constant You don’t need to grow or shrink dynamically Keywords “subarray of size k” “exactly k length” “window size is k” Template expand right remove left ...
🧠 Brute Force Approach (Not Optimal) A simple way is: Convert linked list into an array Check if array is palindrome But this uses extra memory: Time: O(n) Space: O(n) ❌ 🧠Optimal Approach 1. Find the Middle of the Linked List We use two poi...
You are given a linked list where: Each node contains a single digit (0–9) Digits are stored in normal order The linked list represents a number Example: Input: 1 → 9 → 9 Number: 199 Output: 2 → 0 → 0 Number: 200 🧠 Step-by-Step Approach Step...
In this article we will understand the approach of the reverse Node with Kth Group. This is a Linkedlist hard question. We will solve it through javascript and see the logic. Code var getKthNode = function(curr, k){ while(curr && k>0){ cu...
Given an array of integers arr, find the sum of min(b), where b ranges over every (contiguous) subarray of arr. Since the answer may be large, return the answer modulo 10<sup>9</sup> + 7. Problem Statement Given an array: arr = [3, 1, 2, 4] We want:...
