What is the STL in C++?

The STL has three main parts:

• Containers: vector, list, map, set, unordered_map, stack, queue.
• Iterators: objects which point to the items of a container.
• Algorithms: sort, find, count, transform, accumulate and many more.

#include <algorithm>
#include <iostream>
#include <vector>

int main() {
    std::vector<int> v = {4, 1, 3};
    std::sort(v.begin(), v.end());
    for (int x : v) std::cout << x << ' ';
    std::cout << '\n';
}

See STL Containers and Algorithms.

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