1 each section is 90mm, but it actually needs 90+1= 91mm.
Each 1 segment is 38mm, and the actual need is 38+1= 39 mm.
In order to minimize the loss, try to cut it into 90 mm pieces.
You don't need to cut the last paragraph, so the loss is less1mm.
On the other hand, if the loss of 1mm is calculated for each segment,
The length of the steel pipe is equivalent to1000+1=1001mm.
100 1÷9 1= 1 1
Therefore, cutting into 38mm long (0) section and 90mm long (1 1) section has the least loss, and the steel pipes used are just right.