Your task is to build a program (using only printable ASCII characters and/or tabs and newlines) that prints out exactly the characters in the printable ASCII space (0x20 to 0x7e) that don't appear in your program's source code (in any order, however many times you want).
The shortest code to do this in any language wins.
cat(intToUtf8(setdiff(32:126,utf8ToInt("\\\"(),12368:ITUacdefinostu")))) With correction from @JayCe
\\ in the string which costs 2 bytes :( Otherwise I tried to golf it further but couldn't - clever use of setdiff ! \$\endgroup\$ \\\" issue. \$\endgroup\$ {POW(77,7)} /*-#!"$%&'9:;<=>?@ABCDFGHIJKLMNQRSTUVXYZ[\]^_`abcdefghijklmnopqrstuvwxyz|~ Prints 1.604852E+13
The only thing Ink can really do to a string is print it - if you want to do actual string processing, you're meant to hook into external code. This means almost all characters will have to occur in our code, since we generally have no way to print the ones that don't. That means we can basically treat the first occurrence of each character as being free, and see how much stuff we can generate with as few repeated characters as possible.
One thing Ink can do is math. We can generate and print a number. With only two repeated characters, the expression {POW(77,7)} becomes 1.604852E+13, which has eleven distinct characters, none of which are used in the expression.
At this point, there isn't much more we could generate. We need 7 in our code, and while we might be able to generate a -, we'd need another set of {} to do more math, so that would really be a net negative. So we begin a multi-line comment using /* (because Ink doesn't care if we ever close those) and shove all the rest of the characters we aren't using in there.
-5 bytes by creating a larger floating-point number using POW instead of FLOAT, which then also includes E and + and has fewer repeated characters
(u:32+i.97)-.1!:1<":5 write this to a file called 5 in the current directory. Then load execute the script with 0!:1<'5'
Or 25 without the file trick:
(-.~".)'(":u:32+i.0-~95)' 
', which isn't removed from the output. \$\endgroup\$ Clojure (142, 106, 103)
(defn -main[](let[c"(fn[l](pr(reduce disj(set(map char(range 32 126)))l)));-\\\"o"]((load-string c)c))) formatted:
(defn -main [] (let [c "(fn[l](pr(reduce disj(set(map char(range 32 126)))l)));-\\\"o"] ((load-string c) c))) Think this does it, may need some tweaks. output:
#{@ ` ! A B b # C $ D % E & F ' G H I * J + K k , L M . N / O 0 P Q q R S 4 T 5 U V v 7 W w 8 X x 9 Y y : Z z { < | = } > ^ ? _} runs the string, which is evaluateable clojure code, on itself. String has some comments at the end to get the characters used outside of the string (main method, etc)
~:5+1-777(B1D1+7)6+33077777(D3B3@6-7)0&2 !"#$%'*,./489;<=>?AC !"#$%&'()*+,-./0123456789:;<=>?@ABCD~ EFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|} No comments, no hacks, it just opens itself, and checks the contents. Includes the set logic from this answer.
print"".join(set(map(chr,range(32,127)))-set(open(__file__).read())) Changed to print the output and not an array.
print(*set(map(chr,range(32,127)))-set(open(__file__).read())). Longer by 1 character than the other answer, but more pythonic in my opinion \$\endgroup\$ eval "a=$'$(printf '\\x%x' {32..127})'" while read -rn1 c;do a=${a/"$c"};done<$0 echo $a cat > foo.sh # now paste and C-d bash foo.sh # !#&*+,45689:>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`bgjkmqsuyz|~ wc -c foo.sh # 93 (including end-of-line \n) eval thing: construct a string that looks like \x20\x21...\x7f, and use bash&ksh's c-style-quote $'c-escape-str' to wrap it, in order to escape it into some real list-of-chars.${var/pat} to kill corresponding chars in $a. Note that we didn't set IFS properly, and read by default will consume \x20, \n and \t. The \x20 part will be handled later.The output is in ASCII char order.
This very literal (for code golfs at least) one actually ended up smaller than what I expected it to be. Otherwise I will be thinking about # !&*+abc....
00000000: 2b2b 7036 092e 452c 453b 3b78 6f2c 4523 ++p6..E,E;;xo,E# 00000010: 2323 2323 2323 2323 2323 2323 2323 2329 ###############) 00000020: 2929 2929 2929 2929 307e 7620 2122 2425 ))))))))0~v !"$% 00000030: 2627 282a 2d2f 3132 3334 3537 3839 3a3c &'(*-/12345789:< 00000040: 3d3e 3f40 4142 4344 7172 7374 7577 797a =>?@ABCDqrstuwyz 00000050: 7b7c 7d {|} Printable characters aren't too useful in z80, but we can write this:
dec hl dec hl ld (hl),b ld (hl),9 ld l,'E' inc l ld b,l dec sp ; $0009 starts here dec sp ld a,b ld l,a inc l ld b,l inc hl inc hl inc hl inc hl inc hl inc hl inc hl inc hl inc hl inc hl inc hl inc hl inc hl inc hl inc hl inc hl add hl,hl add hl,hl add hl,hl add hl,hl add hl,hl add hl,hl add hl,hl add hl,hl add hl,hl jr nc, $+2+'~' halt db " !\"$%&'(*-/12345789:<=>?@ABCDqrstuwyz{|}" The idea is to print characters from 'F' to 'n', and put all the remaining characters in the code (the "garbage" string at the end).
The preamble writes 09 (tab) to $fffe, so that we can point SP there to jump to $0009 after putchar. The ld (hl), b achieves nothing; I just get rid of 'p' there.
L is initialized to 'E'+1, and counts up until (HL+17) << 9 overflows (sets the carry), which is when L is 111 = 'o', the first character we don't want to print.
If the carry is not set, we jump over a halt instruction and the garbage string, into thousands of NOPs, the PC eventually running into putchar = $8000 and returning to $0009.
See this answer for some more info on how this code prints characters in the first place.
{iii}i{icicicicicic}dd{ci}iicicicici{ic}dd{ci}iciic Because, y'know, I'm hilarious and original.
Saved 15 bytes by repeating a few characters
Saved 4 more by simplifying both instances of d{ic}i to {ci}
Previous Version (55 bytes):
{iii}i{icicicicicic}ddd{ic}iiicicicici{ic}ddd{ic}iiciic 
[ !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\^_`abcdefghijklmnopqrstuvwxyz{|}~] The way this works is pretty simple, any decent Brainfuck interpreter will ignore the code between the brackets appearing at the start of source file, therefore creating a comment.
-1"c"$til[128]except"i"$"-1\"c$til[28]exp;"; .
q)-1"c"$til[128]except"i"$"-1\"c$til[28]exp;"; 345679:<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\^_`abdfghjkmnoqrsuvwyz{|} C++ 143
#include<fstream> #include<iostream> char c[256],d,e=32;int main(){for(std::fstream i(__FILE__);i>>d;)c[d]++;for(;++e<127;)c[e]||std::cout<<e;} Alternative version using macros - 155
#include"iostream" #define d int main(){while(s,*s)l[*s++]++;for(e=35;++e<127;)!l[e]&&std::cout<<e;} #define t(a)#a #define f(a)t(a) char*s=f(d),l[257],e;d And a version without 'reflection' (examining own source) - 139
#include"iostream" char h['~'],*a="'()*+,:;<=[]acdefhilmnorstu{}",i='#';int main(){for(;*a;)h[*a++]++;for(;++i<'~';)if(!h[i])std::cout<<i;} 
p=printf for o in {32..126};{ c=`$p $($p "\%o" $o)` grep -qF "$c" $0||$p "$c" } Output is:
!#&'}+,/45789:<>}@ABCDEGHIJKLMNOPQRSTUVWXYZ[]^_abhjklmsuvwxyz~ 
for v in something; COMPOUND_CMD syntax. Great… \$\endgroup\$ grep replacement, but 5-bytes longer: [[ $(<$0) = *"$c"* ]] \$\endgroup\$ [char[]](32..39+42+44+45+47+58..90+92+94..96+98+100..103+105..113+115..126) A different approach than the other PowerShell answer. Here, we manually build a list of ASCII values (...) that aren't in the source code, then cast that as a char-array [char[]]. PowerShell will by default write out values alone on a line like this, so we get printing for free.
Characters used in code: ()+.0123456789[]achr
@0 --7E <XE\ ../\@0 :E\ }0}0 &0&1 {0{> }0 -F -E -5 -4 >0 -7 >D -F >0 -2 >0 -2 >0 -3 >3 -2 -6 -8 -9 >0 &0&1 \/\/ Main board loops from 0x7E down to 0x20, E\ function rejects values by decrementing and comparing to small numbers (Marbelous' built in < and > operators only work on the range 0-35).
from string import*;print set(printable)-set(open("p").read())
Code must be saved in a file called p.
Lowest python solution so far ;D
w=printf while IFS= read -r -n1 r;do i[$($w %d \'$r)]=1;done<$0 for r in {33..126};do [[ 1 -ne ${i[$r]} ]]&& $w \\$($w "%o" $r);done Save and run with bash <filename>
printf shorter.r read from $0 (i.e. the script itself), set i[ord(r)] to 1.r in range(33, 127), if i[r] is not 1, printf the char corresponding to the number r. The $w \\$($w "%o" $r) part is where the number-to-char magic is: convert the number to OCT, and then prepend a backslash, and finally feed to printf to really print it.The output is in ASCII order.
157 255B'QJ.V"157 2B'QJ.VSK"SK'"K Pushes žQ by converting 157 into base 255.
Executes žQ with .V which pushes the printable ASCII character set (32-128).
Then remove all characters in the source code using K.
D.VsSK but I'm unable to find a way to accomplish it..:( That J screws things up so much.. +1 though, nice answer. \$\endgroup\$ "YSK157 255B'QJ.V"VY.VYSK'"K 28 bytes "YSK157 255B'QJ.V" is the string. This is popped and saved in variable Y, after which it's pushed again, and executed with .V (the YSK are no-ops; and the 157 255B'QJ.V is still the same as in your answer). Then the characters of this string Y are removed with YSK, and finally the double quote is removed (again, same as in your answer) with '"K. \$\endgroup\$ YSK. Using modern 05AB1E, I can get 24 with "8!55+257B.V3.$YSK"VY.V. \$\endgroup\$ 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 Expanded:
74b87337454200d4d33f80c4663dc5e5f7bd60b75b29d79b660a2859395c1a240e9f1e8e40bb79e8 00b0cc9433830cf434ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e800b0cc9433830cf4 34ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e800b0cc9433830cf434ec78fcc91ffb1e 54cd85e4a09243320e9f1e8e40bb79e800b0cc9433830cf47cef8a734855777c2a9d0caf42666e69 b21afc54fb48d153c19101658f4a2a480e9f1e8e40bb79e800b0cc9433830cf40e9f1e8e40bb79e8 00b0cc9433830cf40e9f1e8e40bb79e800b0cc9433830cf4594f803b380a41396ed63dca39503542 f7bd60b75b29d79b660a2859395c1a240e9f1e8e40bb79e800b0cc9433830cf40e9f1e8e40bb79e8 00b0cc9433830cf40e9f1e8e40bb79e800b0cc9433830cf40e9f1e8e40bb79e800b0cc9433830cf4 34ec78fcc91ffb1e54cd85e4a092433234ec78fcc91ffb1e54cd85e4a092433234ec78fcc91ffb1e 54cd85e4a09243320e9f1e8e40bb79e800b0cc9433830cf434ec78fcc91ffb1e54cd85e4a0924332 47bce5c74f589f4867dbd57e9ca9f808f7bd60b75b29d79b660a2859395c1a2434ec78fcc91ffb1e 54cd85e4a092433234ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e800b0cc9433830cf4 594f803b380a41396ed63dca395035420e9f1e8e40bb79e800b0cc9433830cf434ec78fcc91ffb1e 54cd85e4a0924332f7bd60b75b29d79b660a2859395c1a2434ec78fcc91ffb1e54cd85e4a0924332 0cc175b9c0f1b6a831c399e269772661f7bd60b75b29d79b660a2859395c1a24f24c2c15b9d03797 c6874986a8d1951634ec78fcc91ffb1e54cd85e4a0924332faf05c15dfad45dafd1fc23d51236853 f0a1dfdc675b0a14a64099f7ac1cee8374b87337454200d4d33f80c4663dc5e5f7bd60b75b29d79b 660a2859395c1a240e9f1e8e40bb79e800b0cc9433830cf434ec78fcc91ffb1e54cd85e4a0924332 0e9f1e8e40bb79e800b0cc9433830cf434ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e8 00b0cc9433830cf434ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e800b0cc9433830cf4 0e9f1e8e40bb79e800b0cc9433830cf434ec78fcc91ffb1e54cd85e4a092433234ec78fcc91ffb1e 54cd85e4a09243320cc175b9c0f1b6a831c399e269772661f7bd60b75b29d79b660a2859395c1a24 34ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e800b0cc9433830cf4594f803b380a4139 6ed63dca39503542f7bd60b75b29d79b660a2859395c1a2434ec78fcc91ffb1e54cd85e4a0924332 faf05c15dfad45dafd1fc23d5123685334ec78fcc91ffb1e54cd85e4a09243320cc175b9c0f1b6a8 31c399e269772661f7bd60b75b29d79b660a2859395c1a24f0a1dfdc675b0a14a64099f7ac1cee83 f24c2c15b9d03797c6874986a8d1951634ec78fcc91ffb1e54cd85e4a09243327cef8a734855777c 2a9d0caf42666e69b21afc54fb48d153c19101658f4a2a48a87deb01c5f539e6bda34829c8ef2368 c68271a63ddbc431c307beb7d2918275852438d026c018c4307b916406f98c6274985f5115ad1492 12a917dbef8ec801b21afc54fb48d153c19101658f4a2a480cc175b9c0f1b6a831c399e269772661 f7bd60b75b29d79b660a2859395c1a2434ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e8 00b0cc9433830cf474b87337454200d4d33f80c4663dc5e5f7bd60b75b29d79b660a2859395c1a24 0e9f1e8e40bb79e800b0cc9433830cf434ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e8 00b0cc9433830cf434ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e800b0cc9433830cf4 34ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e800b0cc9433830cf40e9f1e8e40bb79e8 00b0cc9433830cf434ec78fcc91ffb1e54cd85e4a09243320e9f1e8e40bb79e800b0cc9433830cf4 34ec78fcc91ffb1e54cd85e4a09243324124bc0a9335c27f086f24ba207a4912f7bd60b75b29d79b 660a2859395c1a24f24c2c15b9d03797c6874986a8d1951634ec78fcc91ffb1e54cd85e4a0924332 faf05c15dfad45dafd1fc23d5123685374985f5115ad149212a917dbef8ec801 Memory GAP's instructions are md5 hashes of their actual instructions. Using ; as a delimiter, this is the "original" program:
; aaaa;size;dup;add;dup;add;dup;add; dup;open;pop; dup; dup; dup; aaaaa;size;dup;dup;dup;dup;add;add;add;dup;add;aaa;size;add;add;dup;aaaaa;dup;add;size;add;a;size;neg;add; btwn; swap; aaaa;size;dup;add;dup;add;dup;add;dup;dup;add;add;a;size;add;dup;aaaaa;size;add;btwn; add; a;size;swap;neg;add; open; pop;char;out;nil;shut;pop; a;size;add; dup; aaaa;size;dup;add;dup;add;dup;add; dup;dup;add;dup;add;aa;size;neg;add;btwn; shut; This simply iterates over the range between 32 and 126, and prints it if and only if it does not fall between '0' and '9' or 'a' and 'f'.
120d115 108 100 93 91 80 62[d1-d43<:]ds:x[l.dP]s;34s.[dl.!=;s,l.1+ds.127>/]ds/x Prints "#$%&'()*?@ABCDEFGHIJKLMNOQRSTUVWXYZ\^_`abcefghijkmnopqrtuvwyz{|}~
The lazy answer of commenting out the entire printable range (and printing nothing) would be 95 bytes, so while this may be suboptimal, I'm pretty pleased.
120d115 108 100 93 91 80 62[d1-d43<:]ds:x puts all the values on the stack that we need to ignore. Decimal is seemingly the ideal base for this, particularly when I factor in the additional characters that would be needed to change the input base. The first few values I have to enter in manually, but I use all the characters from 43-62, so I can generate those in a loop. I don't need to use a few of these characters, but it saves bytes to run through the ones that I don't need, so I named my registers/macros :, ., ,, ;, and / for the sake of using those characters.
[l.dP]s; is the macro that will print the character if it's not in the list. 34s. is the counter - since I use characters 32 and 33, I just start at 34. [dl.!=;s,l.1+ds.127>/]ds/x is a pretty straightforward macro, just load the counter, ., see if it's in the list, run ; if so, increment, and loop until we're out of printable range.
Golfed off four bytes because I was accidentally omitting p (this also made my answer invalid!). I must have at one point used both P and p to print, or thought I would have to.
"lops!;=`][' "s'"ll[p'~=[;]p~![!lo]pl`sl] This one just pushes all the unique characters used in the code (minus ~ to the stack, along with ") then iterates from the codepoint for (space) checking to see if that codepoint is on the stack. Any codepoint that isn't found is printed.
"lops!;=`][' " - loads all the used chars to the stack s - save ` ` (space) to backup cell '" - add `"` to the stack too ll - load the curr codepoint twice [p l] - infinite loop '~=[;]p - if the code point is `~` exit ~ - search stack for curr codepoint ! - negate results boolean [! ]p - if/then, true if not found lo - restore curr codepoint and print l`s - restore curr codepoint and increment Output is: #$%&()*+,-./0123456789<>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\^_abcdefghijkmnqrtuvwxyz{|}
This answer is a compressed version of this code
for(x=0x7e;x>0x19;x--){console.log(String.fromCharCode(x).replace(/[\[\]!\+\(\)]/ig,''))} here is the full working JSFuck version of this code
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] and - don't need to be escaped inside character groups. \$\endgroup\$ Vp.."-"Vp-"- Added for completeness.
Vp in Stax is the set of all printable ASCII characters, .." is the two character string literal (of .") in Stax.
[0^ !"#$%&'()*+,-./123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\_`abcdefghijklmnopqrstuvwxyz{|}~] 
puts (?#..?~).to_a.join.tr"()?!#.,~_aijnoprstu","" Outputs:
$%&'*+-/0123456789:;<=>@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^`bcdefghklmqvwxyz{|} 
print !"#$%&'90*+,-.0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[/\]^_`abcdefghjklmoqsuvwxyz{|} 
chars_in_source = File.read("self.rb").chars.uniq.map(&:ord) printable_ascii = (20..126).to_a not_in_source = printable_ascii.reject { |c| chars_in_source.include?(c) } puts not_in_source.map(&:chr).join And the output is:
#$%'*+,-/345789;<>@ABCDEGHIJKLMNOPQRSTUVWXYZ[\]^`gkvwxyz~ Not the shortest here (in fact, it might be the longest). But that's the great thing about this: it got me to go try something I'd never done before.
VariableNamesGreaterThanOneCharacterLongException on line 1 \$\endgroup\$ I tried to do it the 'clean' (as in 'easy to read') way, turned out quite nice, although i'm still new to python and probably this can be shortened as well.
file named 'a' is the file executed.
from string import* for c in printable: if c not in open('a').read():print c And it prints out all the ASCII characters not found in source file. I know this was supposed to be a clever hack (as in all those which contain all the ascii set or addresses, or use an error), but I wanted to do explicitly what was asked :]
Anyone has a suggestion how to make it even shorter while still going in this direction?
[edit] trimmed one more char, thanks for the tip!
0x20to0x7e, which are defined as the "printable ASCII characters". Technically tabs and newlines are actually control characters. \$\endgroup\$