Word Subsets | Simple Thought Process | C++ | Java | Leetcode 916 | codestorywithMIK

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Published on January 10, 2025 4:29:36 AM ● Video Link: https://www.youtube.com/watch?v=EjXPzWYbviw

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Hi Everyone, this is the 56th video of our Playlist "Strings : Popular Interview Problems".
Now we will be solving a good practice problem based on map and string - Word Subsets | Simple Thought Process | C++ | Java | Leetcode 916 | codestorywithMIK
Since this is a fairly small problem, hence I will also code it in Java in the video itself. Hope that helps.

Problem Name : Word Subsets | Simple Thought Process | C++ | Java | Leetcode 916 | codestorywithMIK
Company Tags : Amazon, Google
My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/strings/Word Subsets.cpp
Leetcode Link : https://leetcode.com/problems/word-subsets


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Video Summary :
This approach determines the universal strings in words1 by comparing character frequencies. Here's a breakdown:

Calculate Maximum Character Frequencies for words2:

Iterate through each string in words2.
Use a temporary frequency array (temp) to count the occurrences of each character in the current string.
Update a global frequency array (freq2) to store the maximum frequency of each character across all strings in words2.
Check Each String in words1:

For each string in words1, calculate its character frequency using a temporary array (temp).
Compare the frequencies in temp with freq2 using the isSubset helper function.
If temp satisfies the subset condition, add the string to the result.
Helper Function (isSubset):

Compares two frequency arrays and ensures that for each character, the frequency in temp is at least as much as in freq2.
Key Insight:

By precomputing the maximum frequency requirements for words2, the algorithm efficiently checks each string in words1 for universality without redundant computations.


✨ Timelines✨
00:00 - Introduction
00:17 - Motivation
01:35 - Problem Explanation
05:25 - Thought Process with examples
11:36 - Small Dry Run
16:11 - Coding in C++
23:27 - Coding in JAVA


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