91. Decode Ways | Leetcode Unlocked - Python
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Master LeetCode 91: Decode Ways with this detailed explanation! This video breaks down a classic dynamic programming problem that's a favorite in coding interviews.
We'll start by understanding the core problem: mapping a string of digits to letters ('1' maps to 'A', '26' to 'Z') and finding out how many unique ways the message can be decoded. We'll cover the crucial edge case of the digit '0' that trips up many developers.
Follow along as we:
Explore an initial recursive approach and see why it's inefficient.
Build a robust bottom-up Dynamic Programming (DP) solution from scratch.
Optimize the DP solution from O(N) space complexity down to O(1) constant space!
This tutorial provides a step-by-step walkthrough of the logic and includes the final optimized code in Python, Java, C++, and JavaScript. Whether you're new to DP or looking to refresh your skills, this guide will make the solution crystal clear.
Perfect for coding interview preparation and improving problem-solving skills.
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Solution Link:
https://leetcode.com/problems/decode-...
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