Problem 798. Rotate input square matrix 90 degrees CCW without rot90

Solution 1973395

Submitted on 13 Oct 2019 by Elandil WANG

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Test	Status	Code Input and Output
1	Pass	assert(isempty(regexp(evalc('type rot_hardway'),'(eval\|fliplr\|flipud\|flipdim\|rot90\|)')))
2	Pass	x = [1 2 3;4 5 6;7 8 9]; y_correct = [3 6 9;2 5 8;1 4 7]; assert(isequal(rot_hardway(x),y_correct))
3	Pass	x = [sqrt(-1) 2 3;4 5 6;7 8 9]; y_correct = [3 6 9;2 5 8;sqrt(-1) 4 7]; assert(isequal(rot_hardway(x),y_correct))
4	Pass	x = magic(9); y_correct = rot90(magic(9)); assert(isequal(rot_hardway(x),y_correct))