2026 Jan OPPE 1 - Set 1

Section 1 · Question 1

Get Element at Circular Index

Return an element using wrap-around indexing. Covers idx % len(lst) and Python's non-negative modulo behaviour.

Solved

Section 1 · Question 2

Signed Absolute Difference of Middle Digits

Find the middle digit(s) of a number and apply the sign of the input. Covers abs(n), parity-based slicing, and sign restoration.

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Section 1 · Question 3

Check Decreasing 4-Digit Number

Same as 2025 May Set 3 - S1Q1. Covers zip(s, s[1:]), all(), and chained comparisons.

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Section 2 · Question 1

Remove K Consecutive Duplicates

Remove runs of k or more identical consecutive elements. Covers itertools.groupby, the one-time-consumption pitfall, and extend().

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Section 2 · Question 2

Movie List Watch Time and Unique Movies

Parse multi-line movie lists, sum watch times, collect unique movies. Full I/O - covers set.update() and ", ".join(sorted(set)).

Solved

Section 3 · Question 1

Student Score Operations

Four operations on student records - count, average, top student, pass count. Covers early returns, lambda dispatch dicts, and max(key=) tie-breaking.

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Section 3 · Question 2

Numeric Palindrome Hourglass

Print a hourglass of numeric palindrome rows. Full I/O - covers palindrome construction, n-k centering formula, and two-loop hourglass structure.

Solved

📁 All slides for this set (GitHub)