LeetCode 169 – Majority Element | LeetCode Top Interview 150 | JavaScript | JDCodebase

Publicado el: 22 diciembre 2025
en el canal de: JDCodebase

Welcome to the LeetCode Top Interview 150 series on JDCodebase!
In this playlist, we solve every problem from the LeetCode study plan using clear PPT-based explanations, intuition, JavaScript code, test cases, and dry-run tables.

Series Link:
https://leetcode.com/studyplan/top-in...

📌 This Video Covers
Problem:
LeetCode 169 – Majority Element
This is a must-know interview problem that helps you understand:
How to identify a majority element using frequency logic
Why the majority element is guaranteed to exist
Different ways to approach the same problem
Trade-offs between time complexity and space complexity
How interviewers evaluate brute force vs optimal solutions

🧠 Problem Summary
You are given an integer array nums
The majority element appears more than ⌊n / 2⌋ times
The majority element always exists
You need to return the majority element value

🛠️ How We Solve It (Intuition + Approach)
In this video, we explain the problem using three approaches for complete understanding:

🔹 Approach 1 – Brute Force
Count occurrences of every element
Return the element whose count exceeds n / 2
Easy to understand but very slow
Not suitable for interviews

🔹 Approach 2 – Hash Map (Better Solution)
Store frequency of each element using a map
Return the element as soon as its count exceeds n / 2
Faster than brute force
Uses extra memory

🔹 Approach 3 – Sorting
Sort the array
The majority element will always be at index ⌊n / 2⌋
Simple logic
Slower than hash map due to sorting

🔧 Techniques Used
Frequency Counting
Hash Map
Sorting
Basic Array Traversal

📊 Complexity Analysis
Brute Force
Time Complexity: O(n²)
Space Complexity: O(1)

Hash Map
Time Complexity: O(n)
Space Complexity: O(n)

Sorting
Time Complexity: O(n log n)
Space Complexity: O(1) / O(log n)

🔗 Important Links
Problem Link:
👉 https://leetcode.com/problems/majorit...

PPT Download (OneDrive):
👉 https://1drv.ms/p/c/d9a1d5f2dacf7aea/...

Complete Playlist (JDCodebase – LeetCode Top Interview 150):
👉 • LeetCode Top Interview 150 – Full Explanat...

GitHub Source Code:
👉 https://github.com/jdcodebase/LeetCod...

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#leetcode #leetcodesolutions #topinterviewquestions #javascript #arrays #hashmap #sorting #majorityelement #jdcodebase #leetcode169

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