magic square for 4x4 doesn't work under 1000 steps #43
Description
I've tried 4x4 magic square but it always returns None with MinConflictsSolver.
However, the following code works
from constraint import *
problem = Problem()
problem.addVariables(range(0, 9), range(1, 9 + 1))
problem.addConstraint(AllDifferentConstraint(), range(0, 9))
problem.addConstraint(ExactSumConstraint(15), [0, 4, 8])
problem.addConstraint(ExactSumConstraint(15), [2, 4, 6])
for row in range(3):
problem.addConstraint(ExactSumConstraint(15),
[row * 3 + i for i in range(3)])
for col in range(3):
problem.addConstraint(ExactSumConstraint(15),
[col + 3 * i for i in range(3)])
solutions = problem.getSolution()
print(solutions)