Problem 52173. Create a function that gives a matrix like the following
x=3
y= [1 -1 -1
0 1 -1
0 0 1];
--------------------------------
x=5
y=
[ 1 -1 -1 -1 -1
0 1 -1 -1 -1
0 0 1 -1 -1
0 0 0 1 -1
0 0 0 0 1]
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