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LeetCode 2976 | Minimum Cost to Convert String I | Daily LeetCode | Day 29/365 | Graph + Floyd Warshall | C++ Solution

In this video, we solve LeetCode Daily Problem 2976: Minimum Cost to Convert String I, where the task is to convert one string into another with the minimum total cost, given allowed character transformations and their costs.

🧠 Core Idea:
Each character conversion can be treated as a directed weighted graph edge. To find the cheapest way to convert one character to another (possibly via intermediate characters), we use the Floyd–Warshall algorithm to compute all-pairs shortest paths.

📌 What you’ll learn in this video:
• How to model character conversions as a graph
• Why Floyd–Warshall is ideal for small fixed alphabets
• Handling impossible conversions safely
• Step-by-step cost calculation for strings
• Clean and interview-ready C++ implementation
• Time and space complexity analysis

⏱ Time Complexity: O(26³ + n)
💾 Space Complexity: O(26²)

💻 Problem Link:
https://leetcode.com/problems/minimum...

🎯 Why this problem matters:
This problem beautifully combines strings + graphs + shortest path algorithms, a pattern frequently seen in interview and contest problems.

👍 Like the video if graph-based thinking clicked
💬 Comment if you want a dry run or visual graph explanation
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