You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
55 lines
1.5 KiB
Python
55 lines
1.5 KiB
Python
#!/usr/bin/python
|
|
#
|
|
# http://mathworld.wolfram.com/QueensProblem.html
|
|
#
|
|
from constraint import Problem
|
|
import sys
|
|
|
|
|
|
def solve():
|
|
problem = Problem()
|
|
size = 8
|
|
cols = range(size)
|
|
rows = range(size)
|
|
problem.addVariables(cols, rows)
|
|
for col1 in cols:
|
|
for col2 in cols:
|
|
if col1 < col2:
|
|
problem.addConstraint(lambda row1, row2, col1=col1, col2=col2:
|
|
abs(row1 - row2) != abs(col1 - col2) and
|
|
row1 != row2, (col1, col2))
|
|
solutions = problem.getSolutions()
|
|
return solutions, size
|
|
|
|
|
|
def showSolution(solution, size):
|
|
sys.stdout.write(" %s \n" % ("-" * ((size * 4) - 1)))
|
|
for i in range(size):
|
|
sys.stdout.write(" |")
|
|
for j in range(size):
|
|
if solution[j] == i:
|
|
sys.stdout.write(" %d |" % j)
|
|
else:
|
|
sys.stdout.write(" |")
|
|
sys.stdout.write("\n")
|
|
if i != size - 1:
|
|
sys.stdout.write(" |%s|\n" % ("-" * ((size * 4) - 1)))
|
|
sys.stdout.write(" %s \n" % ("-" * ((size * 4) - 1)))
|
|
|
|
|
|
def main(show=False):
|
|
solutions, size = solve()
|
|
print("Found %d solution(s)!" % len(solutions))
|
|
if show:
|
|
for solution in solutions:
|
|
showSolution(solution, size)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
show = False
|
|
if len(sys.argv) == 2 and sys.argv[1] == "-s":
|
|
show = True
|
|
elif len(sys.argv) != 1:
|
|
sys.exit("Usage: queens.py [-s]")
|
|
main(show)
|