The k-th Lexicographical String of All Happy Strings of Length n | Leetcode 1415 | codestorywithMIK
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Hi Everyone, this is the 20th video of our Playlist "Backtracking : Popular Interview Problems".
Now we will be solving a good Backtracking practice problem - The k-th Lexicographical String of All Happy Strings of Length n | 2 Ways | Using Standard Template | Leetcode 1415 | codestorywithMIK
We will solve it using the same khandani standard template of backtracking.
Problem Name : The k-th Lexicographical String of All Happy Strings of Length n | 2 Ways | Using Standard Template | Leetcode 1415 | codestorywithMIK
Company Tags : will update later
My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Backtracking/The k-th Lexicographical String of All Happy Strings of Length n.cpp
Leetcode Link : https://leetcode.com/problems/the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
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Video Summary :
Approach-1 (Storing All Happy Strings)
The idea is to generate all valid happy strings using backtracking and store them in a list. Once all possibilities are explored, we simply return the k-th string from the list. This approach ensures correctness but uses extra space since we store all possible strings.
Approach-2 (Without Storing All Strings)
Instead of storing all happy strings, we keep a counter to track how many valid strings we have generated. As soon as we reach the k-th string, we store and return it immediately, avoiding unnecessary space usage. This optimizes space complexity while maintaining correctness.
✨ Timelines✨
00:00 - Introduction
00:23 - Motivation
01:19 - Problem Explanation
04:41 - Approach-1 (Thought Process Khandani Template)
11:26 - Tree Diagram
17:16 - Story To Code
22:30 - Time Complexity
26:00 - Coding Approach-1
28:56 - Approach-2 (Optimised)
31:46 - Time Complexity
33:20 - Coding Approach-2
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