27 lines
629 B
Python
27 lines
629 B
Python
|
|
from constraintsearch import *
|
|
|
|
|
|
def queen_constraint(r1,c1,r2,c2):
|
|
l1 = int(r1[1:])
|
|
l2 = int(r2[1:])
|
|
if c1==c2:
|
|
return False
|
|
if abs(l1-l2)==abs(c1-c2):
|
|
return False
|
|
return True
|
|
|
|
def make_constraint_graph(n):
|
|
queens = [ 'R'+str(i+1) for i in range(n) ]
|
|
return { (X,Y):queen_constraint for X in queens for Y in queens if X!=Y }
|
|
|
|
def make_domains(n):
|
|
queens = [ 'R'+str(i+1) for i in range(n) ]
|
|
cols = [ i+1 for i in range(n) ]
|
|
return { r:cols for r in queens }
|
|
|
|
cs = ConstraintSearch(make_domains(4),make_constraint_graph(4))
|
|
|
|
print(cs.search())
|
|
|