Compress Characters in Python | In-Place String Compression Explained
In this video, we dive deep into solving a classic array problem: Compressing a character array in-place with constant space and efficient logic!
🧩 Problem Statement:
Given an array of characters, compress it using the following rules:
Replace consecutive repeating characters with the character followed by the count.
Store the compressed result in-place within the same array.
Return the new length of the compressed array.
📌 Example Cases Explained:
Input: ["a","a","b","b","c","c","c"] → Output: ["a","2","b","2","c","3"]
Input: ["a"] → Output: ["a"]
Input: ["a","b","b","b","b","b","b","b","b","b","b","b","b"] → Output: ["a","b","1","2"]
💡 What You'll Learn:
Efficient in-place array manipulation
Two-pointer technique
How to handle string-to-char conversions for digits
Keeping constant space usage while modifying an array
🔥 This problem is perfect for preparing for coding interviews at top tech companies.
👨💻 Code Language: Python
🧠 Concepts Covered: Arrays, Two Pointers, In-place Operations, Time & Space Complexity
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