Two lists sharing a pool

What this C++ language-knowledge question tests

This is a medium-difficulty question that probes your understanding of how C++ manages object ownership, memory semantics, and container behavior. It requires careful reasoning about what happens when multiple containers share underlying data, and how standard library types handle copying and lifetime.

To answer questions like this, you need to trace through the code mentally: understand how each data structure is initialized, what operations trigger copies versus moves, and what the final state of each object is after a sequence of assignments and mutations. The question rewards precision in knowing C++ semantics rather than guessing at runtime behavior.

• Container copy and move semantics
• Shallow vs. deep copying
• Object lifetime and memory ownership
• Standard library container internals