Solutions are organized by topic folder, then problem ID. Each submission is stored as a separate file:
<topic-folder>/
<problem-id>/
submission-0.<ext> ← first submission
submission-1.<ext> ← second submission
...
Example:
Data Structures & Algorithms/two-integer-sum/submission-0.py
Data Structures & Algorithms/binary-search/submission-0.ts
Python For Beginners/python-hello-world/submission-0.py