for j = n − 1 to 1 step − 1 do
does this means for all j in [1 .. n-1] or [2 .. n-1] ?
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for j = n − 1 to 1 step − 1 dois a countdown.It will start at j and count down to 1 (inclusive).
So if j is 6, then it will go down 5, 4, 3, 2, 1.
twist: Now if your j is a negative value, then you should consider that it will go upto the min negative first, then rollover to the max positive and then count down to 1.