Talk:Peaceful chess queen armies: Difference between revisions

I was experimenting with various things when doing the Python.

 

from functools import lru_cache, reduce

 

 

_bbullet, _wbullet = '\u2022\u25E6'

_or = set.__or__

 

def place(m, n):

"Place m black and white queens, peacefully, on an n-by-n board"

placements = {frozenset(c) for c in combinations(board, m)}

for blacks in placements:

(queen_attacks_from(pos, n) for pos in blacks),

set())

if not black_attacks & whites:

return blacks, whites

 

@lru_cache(maxsize=None)

a = set([pos]) # Its position

# Diagonals

for x1 in range(n):

# l-to-r diag

y1 = y0 -x0 +x1

if 0 <= y1 < n:

# r-to-l diag

y1 = y0 +x0 -x1

if 0 <= y1 < n:

return a

 

if black_white is None:

blk, wht = set(), set()

print(f"## {len(blk)} black and {len(wht)} white queens "

f"on a {n}-by-{n} board:", end='')

print()

ch = ('?' if xy in blk and xy in wht

print('%s' % ch, end='')

print()

 

if __name__ == '__main__':

n=2

for n in range(2, 7):

print()

for m in count(1):

ans = place(m, n)

if ans[0]:

pboard(ans, n)

else:

break

print('\n')

m, n = 5, 7

ans = place(m, n)

 

{{out}}