Originally posted by: xspeng

I would like to define the index and sets,

J :number of jobs
M: number of machines
O_j: number of operations of job j
j :index of job; 1 <=  j <= J
m: index of machine; 1 <=  m <= M
o: index of operation; 1 <=  o <=O_j
B(j,o): set of machines that can perform operation o of job j

I have define:

int J = ...;
range jobs = 1..J; 
int M = ...;
range machines = 1..M;

How do I define Oj and B(j,o) ?