I suggest adding additional test cases to make the problem stronger.
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Given a 4x4 matrix, swap the two middle columns
construct matrix with identical rows
Replace 0 indices in array with 1's
Matrix Ax=B problem
Find the index of the lowest number in a matrix
Find the sum of the largest two elements in a vector
String Delimination and Outputting
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