how should i sort the matrix
M = [0,15,14,13,10,7,4,1,2;0,0,9,6,4,12,1,3,1;0,0,0,10,8,5,3,1,2;0,0,0,0,17,2,11,1,4;0,0,0,0,0,1,12,1,7;0,0,0,0,0,0,1,7,5;0,0,0,0,0,0,0,3,9;0,0,0,0,0,0,0,0,8];
to get the sorted index positions as
[4,5], [1,2], [1,3], [1,4], [2,6], [5,7], [4,7], [1,5].....
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