Decode Ways | Recursion | Memo | Bottom Up | Leetcode 91

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Published on ● Video Link: https://www.youtube.com/watch?v=HW-y3gvQTVQ


Duration: 40:04
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This is the 75th Video of our Playlist "Dynamic Programming : Popular Interview Problems".
In this video we will try to solve a famous and good DP Problem - Decode Ways (Leetcode 91).

I will explain the intuition so easily that you will never forget and start seeing this as cakewalk EASYYY.
We will do live coding after explanation and see if we are able to pass all the test cases.
Also, please note that my Github solution link below contains both C++ as well as JAVA code.

Problem Name : Decode Ways
Company Tags : Google, Meta, Microsoft, Uber
My solutions on Github(C++ & JAVA) : https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/DP/Decode%20Ways.cpp
Leetcode Link : https://leetcode.com/problems/decode-ways/

My DP Concepts Playlist : https://youtu.be/7eLMOE1jnls
My Graph Concepts Playlist : https://youtu.be/5JGiZnr6B5w
My GitHub Repo for interview preparation : https://github.com/MAZHARMIK/Interview_DS_Algo
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Approach-1 Summary (Recursion + Memoization) : The solve function explores decoding possibilities, memoizing results to avoid redundant calculations. The approach considers base cases for index bounds and '0' digits, and recursively calculates decoding possibilities for single and double-digit combinations. The method initializes memoization, sets the string length, and returns the total number of decoding possibilities.

Approach-1 Summary (Bottom Up) : In this approach, we iterate through the string, maintaining a vector t to store the number of ways to decode strings of various lengths. It updates the decoding possibilities based on the current and previous digits, considering valid two-digit combinations. The method initializes the string length n and returns the total number of decoding possibilities.

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✨ Timelines✨
00:00 - Introduction

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