x86-64 machine code, 27 bytes

6A D7 58 99 B1 10 48 D3 C0 48 AB C6 07 0A AE 80 C1 48 73 F2 FF C2 74 EC 88 37 C3

Try it online!

Following the standard calling convention for Unix-like systems (from the System V AMD64 ABI), this takes in RDI a memory address at which to place the result, as a null-terminated byte string in ISO-8859-1.

In assembly:

f:	push -41; pop rax   # Set RAX to -41: low byte 0xD7, other bytes 0xFF.
	cdq                 # Set EDX to -1 by sign-extending EAX.
r4:	mov cl, 0b00010000  # Set CL to 2*8.
r:	rol rax, cl         # Rotate RAX left by the value of CL.
	    # CL will always be a multiple of 8; this moves the 0xD7 byte.
	stosq               # Write RAX to the string, advancing the pointer.
	mov [rdi], '\n'     # Add a line feed to the string.
	scasb               # Advance past it while comparing it with AL.
	add cl, 0b01001000  # Add 1*8+64 to CL.
	jnc r               # Jump if no carry; iterate 4 times.
	inc edx             # Add 1 to EDX.
	jz r4               # Jump (here resetting CL) if it's 0.
	mov [rdi], dh       # Add a 0 byte from DH to the string.
	ret                 # Return.

The output is:

ÿÿ×ÿÿÿÿÿ
ÿÿÿÿÿ×ÿÿ
ÿ×ÿÿÿÿÿÿ
ÿÿÿÿÿÿ×ÿ
×ÿÿÿÿÿÿÿ
ÿÿÿ×ÿÿÿÿ
ÿÿÿÿÿÿÿ×
ÿÿÿÿ×ÿÿÿ

This solution was chosen for the pattern formed by the horizontal offsets between queen positions in adjacent rows, wrapping around and starting at 0; those offsets are 2, 3, 4, 5, 2, 3, 4, 5.

posted about 2 years ago

CC BY-SA 4.0

2y ago

m90‭

271 reputation 0 10 27 1

JavaScript, 48 bytes

_=>[..."41506372"].map(x=>1e8/9+10**x|0).join`
`

Try it online!

The string "41506372" encodes the position of the queen in each row.

1e8/9 gives 11111111.1111..., and adding 10^x changes a digit from 1 to 2 at position x.

The bitwise operation is a short way to cause a conversion to integer, removing the fractional part, and finally, join inserts line feeds in between the numbers.

posted about 2 years ago

CC BY-SA 4.0

m90‭

271 reputation 0 10 27 1

Japt -R, 16 15 bytes

Uses spaces for #s and "s for Qs.

##Ë64ì £QùXÄÃy

Test it (footer reformats the output to use the characters from the spec)

This one uses 1s for #s.

##Ë64ì £#ÿ¤hXQ

Test it (footer as above)

##Ë64ì £QùXÄÃy
##Ë64              :15720364
      ì             :To digit array
        £           :Map each X
         Q          :  Quotation mark
          ù         :  Left pad with spaces to length
           XÄ       :    X+1
             Ã      :End map
              y     :Transpose (which pads with spaces)
                    :Implicit output joined with newlines

##Ë64ì £#ÿ¤hXQ
##Ë64ì £           :As above
         #ÿ         :  255
           ¤        :  To binary string
            hXQ     :  Replace the character at index X with "

"But, Shaggy, why ... no, how is that 15720364?" "Glad you asked! See this tip here"

posted about 2 years ago

CC BY-SA 4.0

2y ago

Shaggy‭

2131 reputation 4 116 216 166

Vyxal, 9 bytes

×»∇ḂẆ»f꘍§

Try it Online!

Uses spaces for empty and asterisks for queen. Add a › at the end to replace spaces with zeros.

×»∇ḂẆ»f꘍§
 »∇ḂẆ»f   # 13572064 as a list of digits
×      ꘍  # For each, prepend that many spaces to an asterisk
        § # Vertical join: transpose filling with spaces, and join on newlines

posted about 2 years ago

CC BY-SA 4.0

2y ago

steffan153‭

121 reputation 0 8 12 6

J, 20 bytes

'01'{~#:2^2842 A.i.8

Attempt This Online!

Non-tacit program that outputs implicitly in a REPL. Shoutout to Raul (Miller)#5220 in the APL farm discord for thinking of this cool idea.

          2842 A.i.8  : Anagram 2842 of 0..8 -> 0 4 7 5 2 6 1 3
        2^            : Raise 2 to each value
      #:              : Create matrix of each binary conversion
'01'{~                : Index '01' using each value of the result

posted about 2 years ago

CC BY-SA 4.0

2y ago

south‭

361 reputation 0 44 36 22