Corner to Corner

A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Seniority

L4

Problem

A square matrix from a tabular export arrives flattened: a single row-major list `cells` holding n*n integers, plus its side length `size`. Return the values on the main diagonal, from the top-left corner to the bottom-right. An empty buffer returns an empty list.

Summary

A grid pressed flat still remembers its corners.

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