Next Greater Element I - Leetcode 496 | Stack + Map JavaScript Solution

Опубликовано: 05 Август 2026
на канале: Web Coder Abhishek

341

In this video, solve LeetCode 496: Next Greater Element I using an efficient monotonic stack + hash map solution in JavaScript.

You are given two arrays nums1 and nums2, where nums1 is a subset of nums2. For each element in nums1, you must find its next greater element to the right in nums2, or return -1 if it doesn’t exist.

What you’ll learn:What “next greater element to the right in nums2” really means.How to traverse nums2 with a decreasing monotonic stack to precompute next greater values in O(n).

How to store results in a map and answer all nums1 queries in O(m).Full JavaScript implementation, brute force vs optimized, and complexity analysis.

📌 Examples:
nums1 = [4,1,2], nums2 = [1,3,4,2] → [-1,3,-1]
nums1 = [2,4], nums2 = [1,2,3,4] → [3,-1]
Perfect for stack patterns, array + map problems, and coding interview prep in JavaScript.

⏯️⏯️ Follow the Web Coder Abhishek channel on WhatsApp: https://whatsapp.com/channel/0029VaJY...

⏯️⏯️Playlist Links Watch It :

⏩⏩ WEB DEVELOPMENT PLAYLIST :    • Master Web Development: From Basics to Adv...

⏩⏩ GITHUB PLAYLIST :    • Master Git & GitHub: From Zero to Hero - C...

⏩⏩ HOSTING PLAYLIST :    • Master Website Hosting & Deployment: From ...

⏩⏩ ADVANCED CSS PLAYLIST :    • Elevate Your CSS Skills: Master Advanced T...

⏩CSS Complete Course Link :    • Master CSS from Scratch to Pro-Level Styling!

⏩Html Complete Course Link :    • Master HTML from Basics to Advanced: Your ...

⏩C Programming Playlist Link :    • C Programs

🔥Source Code :
https://github.com/AbhishekNayak-Prog...

⏩Website Building Playlist :    • Playlist

⏩Technical Interview Question :    • Playlist

⏩Bput Updated News Playlist :    • BPUT

❤️Guys, Please support my channel by SUBSCRIBE to my channel and share my videos in your Social Network TimeLines.❤️

☑️Don't Forget to Follow me on all Social Network, ✅

↔️Website Link: https://abhisheknayak.netlify.app

↔️Instagram Link:   / _t.i.g.e.r_143

↔️LINKEDIN Link:-   / abhishek41

↔️Facebook Link: https://www.facebook.com/profile.php?...

↔️Twitter Link:   / abhishe39969350

Thanks For Watching

Keywords:
leetcode 496
next greater element I
javascript stack solution
monotonic stack js
next greater to right
array and stack problem
hash map js
dsa javascript
coding interview question
next greater element js

Hash tags:- #leetcode #javascript #dsa #coding #programming #reactjs