Introduction - If you have any usage issues, please Google them yourself
M length of wood with a number of roots, to process it into a short length of n different wood, given the length of each short-wood, a, number of roots needed b, sawing wood, saw kerf produced by 5 (that is what each saw loss of length 5), the demand for a given n different lengths of wood, and the corresponding length and number of b after a required minimum number of wood raw materials and cutting method