Given a matrix, sort it for each column, but cannot change the element of each row. for example input = [1 3; 2 4;1 5;3 6]; the result returned by you is target = [1 3; 1 5;2 4; 3 6];
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The problem statement should say what is and is not allowed for the solution, particularly if you're going to invalidate previously valid solutions.
Agree with Guillaume.