Need a test case with a 0 on the chosen diagonal.
Agree with Jon's comment that the matrix should contain 0 elements
so simple that it never occurred to me
Test for balanced parentheses
Sum of first n terms of a harmonic progression
Rotate input square matrix 90 degrees CCW without rot90
Chess ELO rating system
Numbers spiral diagonals (Part 1)
Find files with extension ext in the current directory
Longest Collatz Sequence
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