📦 C++ Standard Template Library (STL)

The STL is a powerful collection of classes and functions for handling common data structures and algorithms — making C++ feel modern as hell.

📚 Example: Using a Vector and a Map

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💡 Pro Tip: STL saves you from writing your own linked lists, hash maps, and sorting algorithms. It’s battle-tested and highly optimized.

🔧 Core STL Containers

vector — Dynamic array (fast random access, slow inserts/removals in middle)
list — Doubly linked list
map — Key/value pairs (ordered by key)
unordered_map — Faster, no order
set — Sorted unique values
queue, stack, priority_queue — Specialized container adapters

⚡ Algorithms You Can Use

sort()
find()
count()
reverse()
accumulate() (from <numeric>)