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
So many choices
Calculate the area of a triangle between three points
Generate a random matrix A of (1,-1)
Mirror Image matrix across anti-diagonal
Negation and new variables
Pandigital number n°2 (Inspired by Project Euler 32)
Mysterious digits operation (easy)
Longest Collatz Sequence
Find Missing Number
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