Пост #120367

import numpy

numQueens = 8
solutions = []


def board(placed):
    for c in placed:
        r = ['_  '] * 8
        r[c] = '♕ '
        print(''.join(r))  # строка из списка
    print('-' * 22)
    print(placed)


def check(y1, x1, y2, x2):
    samev = x1 == x2
    sameh = y1 == y2
    maind = x1 + y1 == x2 + y2
    secondd = x1 - y1 == x2 - y2
    return samev or sameh or maind or secondd


def invalid(placed, x2):
    for y, x in enumerate(placed):
        if check(y, x, len(placed), x2):
            return True


def queens(valid, placed):
    if len(placed) == numQueens:
        solutions.append(placed[:])
        return
    for y, x in enumerate(valid):
        if invalid(placed, x):
            continue
        placed.append(x)
        queens(list(valid[:y]) + list(valid[y+1:]), placed)
        placed.pop()


print("a")
a = int(input())
b = int(input())

print(solutions)

queens(range(8), [])
for solution in solutions:
    board(solution)
print("Всего решений: ", len(solutions))