OJ Board

It isn't easy to draw the examples because the notation used is underspecified. You need to know not only if you have an undercrossing or overcrossing but also the orientation of the crossing.
As for the numbering of the crossings, the problem statement says that you must number the crossings ...

how can i draw these examples?
i think the first knot must be 1, since we start "walking" from a extreme... dont?

hello, i had the same ideas about BRIDGES, and LOOPS.
I didnt have the TRIANGLES one, but had the "FREE EXTREMES"... well, if both extreme knot are positives or negatives they are unecessary (or not, hehe)
but im making some mistakes too...
lets trying again