Given the following memo dictionary state during a deep copy operation: memo = {id(obj1): copy_of_obj1, id(obj2): copy_of_obj2} If copy_of_obj2's nested list contains an element referencing copy_of_obj1, which original object does this nested list element correspond to?

hard🔄 Reverse Engineer Q9 of Q15

OOP & Design Patterns - Prototype Pattern - Deep Copy vs Shallow Copy

AA new object unrelated to obj1 or obj2

Bobj2 itself

Cobj1

DThe copy_of_obj2 object

Step-by-Step Solution

Solution:

Step 1: Understand memo dictionary role
Memo maps original object ids to their copies to handle shared references and cycles.
Step 2: Trace nested reference
If copy_of_obj2's nested list contains copy_of_obj1, it corresponds to original obj1, preserving reference identity.
Final Answer:
Option C -> Option C
Quick Check:
Memo ensures nested references map to original objects -> [OK]

Quick Trick: Memo maps original objects to their copies preserving references [OK]

Common Mistakes:

MISTAKES

Confusing copy objects with originals
Assuming nested references are new unrelated objects

Trap Explanation:

PITFALL

Candidates confuse copies with originals when reasoning about nested references.

Interviewer Note:

CONTEXT

Tests deep understanding of memoization in deep copy.

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Given the following memo dictionary state during a deep copy operation: memo = {id(obj1): copy_of_obj1, id(obj2): copy_of_obj2} If copy_of_obj2's nested list contains an element referencing copy_of_obj1, which original object does this nested list element correspond to?

Step 1: Understand memo dictionary role

Step 2: Trace nested reference

Final Answer:

Quick Check:

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