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📌 Transform Strings to Uppercase using transform and toupper in C++ | STL Explained

In this video, you’ll learn how to convert all strings in a vector to uppercase using the power of std::transform() and std::toupper() in C++.
This is a very useful STL trick when dealing with string manipulation, formatting, and text-based DSA problems.

✅ transform() helps apply a function to each element, and toupper() handles the character conversion — all done cleanly using lambda functions.

🎯 What you’ll learn:

How to apply transform on each string

Convert characters to uppercase using toupper

Use of lambda for clean and readable logic

Full C++ code with explanation

Real DSA and text-processing use cases

📚 Language Used: C++
📂 Topic: STL – transform(), string manipulation
📌 Difficulty: Beginner Friendly

🚀 Time Complexity: O(n * m)
🧠 Useful in: Text formatting, Case-insensitive comparison, DSA string questions

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