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Возврат к головоломкам

Какое максимальное количество ферзей можно разместить на шахматной доске так, чтобы они не атаковали друг друга? На доске размером n*n?

Ответ: 1, при n=1, 2; 2, при n=3; n, при n>=4. Итого на стандартной доске 8*8 - 8:

    1   2   3   4   5   6   7   8
   ___ ___ ___ ___ ___ ___ ___ ___
h |   |   |   |   |   |   | Ф |   |
   --- --- --- --- --- --- --- ---
g |   |   |   |   | Ф |   |   |   |
   --- --- --- --- --- --- --- ---
f |   |   | Ф |   |   |   |   |   |
   --- --- --- --- --- --- --- ---
e | Ф |   |   |   |   |   |   |   |
   --- --- --- --- --- --- --- ---
d |   |   |   |   |   | Ф |   |   |
   --- --- --- --- --- --- --- ---
c |   |   |   |   |   |   |   | Ф |
   --- --- --- --- --- --- --- ---
b |   | Ф |   |   |   |   |   |   |
   --- --- --- --- --- --- --- ---
a |   |   |   | Ф |   |   |   |   |
   --- --- --- --- --- --- --- ---

ремонт айпад