1. The document provides code for implementing common data structures including singly linked lists, stacks, and queues. It includes class templates for each with member functions for common operations like insertion, removal, accessing elements, checking sizes, etc.
2. The code is accompanied by requirements to write functions to insert into a linked list while maintaining order, check balanced parentheses with a stack, and allow input/output of multiple queues.
3. The provided code implements core functionality while the requirements call for additional functions to utilize the data structures.