A Optimized function to check if a queen can be placed on board [ row ] [ col ]
def isSafe ( row , col , slashCode , backslashCode , rowLookup , slashCodeLookup , backslashCodeLookup ) : NEW_LINE INDENT if ( slashCodeLookup [ slashCode [ row ] [ col ] ] or backslashCodeLookup [ backslashCode [ row ] [ col ] ] or rowLookup [ row ] ) : NEW_LINE INDENT return False NEW_LINE DEDENT return True NEW_LINE DEDENT