All Questions
Tagged with c++ constraint-programming
9 questions
4
votes
1
answer
2k
views
How exactly does OptionalIntervalVar work in OR-Tools?
I created OptionalIntervals for a number of tasks:
...
6
votes
1
answer
2k
views
assigning values to IntVar if and only if BoolVar, else zero [or-tools]
If I have an IntVar s[j] stored in a vector s, is it possible to iterate for (a period of ...
6
votes
0
answers
234
views
OptionalIntervalVar enforced but not working OR-TOOLS
I'm using OptionalIntervalVar and then maximizing the starts. The optimal solution is not affecting the other variables that creates the ...
6
votes
0
answers
167
views
Modelling issue with precedence constraint in OR-Tools
I'm trying to solve an RCPSPDc model It is infeasible, although Ilog Cplex solves it, so I think I have a modelling issue. I have more constraints but the precedence is the one that makes it ...
3
votes
1
answer
211
views
ValidateModel or tools in c++ and proto problems
I'm trying to validate my model, this is the relevant part of my code:
...
4
votes
0
answers
109
views
Modelling issue with rcpsp and boolean expressions
I'm trying to solve an RCPSPDc problem in OR-Tools with CP-SAT solver.
In my RCPSPDc model (with discount rate) i want to set this objective:
$$\max_{s}\sum_{j\in J}\text{profit}_{j}\cdot \frac{1}{(1+...
6
votes
1
answer
3k
views
Cumulative Constraint OR-Tools
I'm trying to solve an rcpsp model.
I can't find documentation for the AddCumulative function of OR-Tools. How should this function be used?
I want to write this ...
8
votes
1
answer
505
views
Precedence Constraint in OR-Tools
I'm trying to write this constraint in C++ and add it to my model (addLessOrEqual):
$$\text{start}_{i}+\text{duration}_{i}\le\text{start}_{j}$$ for an $(i,j)$ arc ...
14
votes
2
answers
612
views
How to implement a custom global constraint in IBM's ILOG CP optimizer
How do you implement a custom, global constraint in CP Optimizer? This is not a trivial thing to do, as CP Optimizer does not ship any examples of a custom constraint, and the documentation is very ...
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