How do I sort and stable_sort elements with std::queue?

In C++, the `std::queue` container does not provide direct support for sorting operations, as it is designed specifically for queue operations (FIFO - First In First Out). However, to sort the elements of a queue, you can first transfer the elements to a different container like `std::vector`, sort it there, and then transfer it back to the queue.

This approach allows you to sort the elements using `std::sort` or `std::stable_sort`. The regular `std::sort` is not stable, meaning that it may not preserve the relative order of equivalent elements, whereas `std::stable_sort` guarantees that order is preserved.

Here is an example of how to use `std::queue`, `std::vector`, and the `std::sort` function.


        #include 
        #include 
        #include 
        #include 

        int main() {
            std::queue q;
            q.push(4);
            q.push(1);
            q.push(3);
            q.push(2);

            // Step 1: Transfer elements to a vector
            std::vector vec;
            while (!q.empty()) {
                vec.push_back(q.front());
                q.pop();
            }

            // Step 2: Sort the vector
            std::sort(vec.begin(), vec.end()); // For stable sort, use std::stable_sort

            // Step 3: Transfer sorted elements back to the queue
            for (const auto& val : vec) {
                q.push(val);
            }

            // Display sorted queue
            while (!q.empty()) {
                std::cout << q.front() << " ";
                q.pop();
            }
            return 0;
        }

std::queue sorting std::sort stable_sort C++ sorting C++ STL queue example C++ vectors

How do I sort and stable_sort elements with std::queue?

Popular Topics

Recent Languages

How do I sort and stable_sort elements with std::queue?

Related Questions

Popular Topics

Recent Languages