Merge Two 2D Arrays by Summing Values | Multiple Approaches | Leetcode 2570 | codestorywithMIK
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Hi Everyone, this is the 71st video of our Playlist "Leetcode Easy".
Now we will be solving an easy practice problem on Array based on 2 Pointers - Merge Two 2D Arrays by Summing Values | Multiple Approaches | Leetcode 2570 | codestorywithMIK
We will solve it using multiple Approaches. First using (HashMap + Sorting), Second using Approach-2 (Ordered Map), and third using 2 Pointer approach.
Problem Name : Merge Two 2D Arrays by Summing Values | Multiple Approaches | Leetcode 2570 | codestorywithMIK
Company Tags : will update later
My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Arrays/Leetcode Easy/Merge Two 2D Arrays by Summing Values.cpp
Leetcode Link : https://leetcode.com/problems/merge-two-2d-arrays-by-summing-values
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Video Summary :
Approach-1 (HashMap + Sorting): We use a map to store the sum of values for each unique key, then extract and sort the entries. This approach leverages fast lookups but requires sorting at the end.
Approach-2 (Ordered Map): A map that maintains sorted keys automatically is used to merge values while ensuring order. This removes the need for explicit sorting but has logarithmic insertion time complexity.
Approach-3 (Two Pointers): Since both arrays are sorted, we merge them efficiently using two pointers, directly producing a sorted result in linear time without extra space.
✨ Timelines ✨
00:00 - Introduction
0:24 - Motivation
0:58 - Problem Explanation
3:31 - Brute Force
4:46 - Approach-1 (Using map and sorting)
7:10 - Approach-2 (Using Ordered Map)
9:00 - Approach-3 (Using 2 Pointer)
15:35 - Coding all approaches
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