The k-th Lexicographical String of All Happy Strings of Length n | Backtracking

🧩 *PROBLEM DESCRIPTION*

A **happy string** is a string that:

- consists only of letters of the set `['a', 'b', 'c']`.
- `s[i] != s[i + 1]` for all values of `i` from `1` to `s.length - 1` (string is 1-indexed).

For example, strings **"abc", "ac", "b"** and **"abcbabcbcb"** are all happy strings and strings **"aa", "baa"** and **"ababbc"** are not happy strings.

Given two integers `n` and `k`, consider a list of all happy strings of length `n` sorted in lexicographical order.

Return _the kth string_ of this list or return an **empty string** if there are less than `k` happy strings of length `n`.]()

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🔗 *LINKS*

⭐Problem: https://leetcode.com/problems/the-k-th-lexicographical-string-of-all-happy-strings-of-length-n/
💻Code: https://k5kc.com/cs/problems/the-k-th-lexicographical-string-of-all-happy-strings-of-length-n/

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📂 *RELATED PLAYLISTS To Explore*

🔄 Backtracking: https://www.youtube.com/playlist?list=PLB53ggSrd6qnfia6qY8FNx-xYmqU8j_Rf
🔤 String Datastructure: https://www.youtube.com/playlist?list=PLB53ggSrd6qkQWiNs58TAPorNIvYQlfy_
🟡 Medium Coding Problem: https://www.youtube.com/playlist?list=PLB53ggSrd6qmhoEi071-M4RTJiwz9uZEs

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