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def solve_n_queens(n):
def is_safe(board, row, col):
# Verificar la columna
for i in range(row):
if board[i][col] == 1:
return False
# Verificar la diagonal izquierda
i, j = row, col
while i >= 0 and j >= 0:
if board[i][j] == 1:
return False
i -= 1
j -= 1
# Verificar la diagonal derecha
i, j = row, col
while i >= 0 and j < n:
if board[i][j] == 1:
return False
i -= 1
j += 1
return True
def solve(board, row):
if row >= n:
solution = []
for r in board:
solution.append("".join(['Q' if x == 1 else '.' for x in r]))
solutions.append(solution)
return
for col in range(n):
if is_safe(board, row, col):
board[row][col] = 1
solve(board, row + 1)
board[row][col] = 0
solutions = []
board = [[0] * n for _ in range(n)]
solve(board, 0)
return solutions
# Ejemplo de uso:
n = 8
solutions = solve_n_queens(n)
for sol in solutions:
for row in sol:
print(row)
print()
-
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