Letter Tile Possibilities | 2 Ways | Using Standard Template | Leetcode 1079 | codestorywithMIK

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Published on February 17, 2025 4:22:40 AM ● Video Link: https://www.youtube.com/watch?v=cD0D-QSKG20

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Hi Everyone, this is the 19th video of our Playlist "Backtracking : Popular Interview Problems".
Now we will be solving a good Backtracking practice problem - Letter Tile Possibilities | Khandani Template | 2 Ways | Leetcode 1079 | codestorywithMIK

We will solve it using the same khandani standard template of backtracking.

Problem Name : Letter Tile Possibilities | 2 Ways | Using Standard Template | Leetcode 1079 | codestorywithMIK
Company Tags : will update later
My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Backtracking/Letter Tile Possibilities.cpp
Leetcode Link : https://leetcode.com/problems/letter-tile-possibilities


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Video Summary :
Approach-1 (Boolean Array & Permutation Generation):
This approach uses a boolean array to track which tiles have been used while building sequences.
It applies a standard backtracking template where the current sequence is extended by appending an unused tile.
Each recursive call explores further possibilities until all tile orders are considered.
Backtracking is performed by unmarking the tile and removing it from the sequence to try alternative orders.

Approach-2 (Character Count Method):
This approach leverages a character count array to monitor the availability of each tile.
It recursively builds sequences by choosing only those characters that have a positive count remaining.
The chosen character’s count is decremented during recursion and restored after backtracking.
This method naturally avoids duplicates by limiting the recursion to available characters only.


✨ Timelines✨
00:00 - Introduction
00:12 - Motivation
00:36 - Problem Explanation
03:08 - Approach-1 (Khandani Template) + Tree Diagram
15:35 - Time & Space Complexity
17:11 - Coding Approach-1
20:31 - Approach-2 (character count)
26:07 - Coding Approach-2

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