[tylrcc]

For #242 — the files I named in my comment on the issue.

practice105.py through practice112.py in solutions/python/ already had # Problem: and # Source: headers, but no # Note: and no description, so a reader still could not tell what approach each solution takes. This adds exactly one # Note: line to each, written from reading the code:

• practice105 — greedy halve/subtract-or-add loop for reducing n to 1
• practice106 — stack applies s's backspaces, result compared with t as entered
• practice107 — brute force over every pair swap
• practice108 — maximum checked against twice every other element
• practice109 — sorted scan for the first gap between neighbours
• practice110 — set intersection of the two arrays
• practice111 — brute-force product of all other elements, O(n^2)
• practice112 — single pass splitting words at uppercase letters

Comments only: the diff is 8 insertions and 0 deletions, and every added line is a comment. I did not change any code, including where a script's approach differs from the canonical solution for its problem (the notes describe what the code in the file actually does). All eight files still compile (py_compile), and I smoke-ran practice110 and practice111 with sample input to confirm unchanged behaviour.

For context: I scanned the whole solutions/python/ folder — every file there already has Problem and Source headers; about 90 files are in the same no-Note state as these eight, so the issue still has plenty of files for other contributors.

[Huerte]

@tylrcc Hi there! Thank you for the contribution and for the detailed findings.