8000 crash in NoOverlap constraint for ortools, inconsistency in minizinc. · Issue #685 · CPMpy/cpmpy · GitHub
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crash in NoOverlap constraint for ortools, inconsistency in minizinc. #685

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peerjosse opened this issue May 21, 2025 · 0 comments
Open

crash in NoOverlap constraint for ortools, inconsistency in minizinc. #685

peerjosse opened this issue May 21, 2025 · 0 comments
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bug inconsistency

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@peerjosse
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erroneous solvers: ortools, minizinc
working solvers: z3, choco, gurobi

In the following program:

  • ortools gave an error
  • minizinc returned 1 solution
  • z3, choco and gurobi all returned 7 solutions
import cpmpy as cp

m = cp.Model()
p = cp.boolvar()
x = cp.intvar(-3, 5)
y = cp.intvar(-3, 5)
z = cp.intvar(-3, 5)
l = cp.intvar(0, 10)
m += cp.NoOverlap([x, p, z], [l, y, p], [p, z, x])

# print(m.solveAll(solver='ortools'))                   # returns an error
print(m.solveAll(solver='minizinc'))                    # returns 1
print(m.solveAll(solver='z3'))                          # returns 7
print(m.solveAll(solver='choco'))                       # returns 7
print(m.solveAll(solver='gurobi', solution_limit=100))  # returns 7
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