This code golf challenge is about making a rocket liftoff sequence.
Your output (STDOUT) should be equal to this:

Liftoff in T-10
Liftoff in T-9
Liftoff in T-8
Liftoff in T-7
Liftoff in T-6
Liftoff in T-5
Liftoff in T-4
Liftoff in T-3
Liftoff in T-2
Liftoff in T-1


  • Your output must print to STDOUT.
  • Your program must not raise any errors.
  • This is code golf, shortest code in bytes wins.
  • 10
    \$\begingroup\$ What does it mean for the output to be "similar to this"? You should specify it exactly. And is the "..." in the output something we actually print verbatim, or does it stand for the middle part of the sequence? \$\endgroup\$ – xnor Dec 3 '20 at 13:15
  • 6
    \$\begingroup\$ Welcome to Code Golf! We have a couple of default rules that should not be overridden unless there's a good reason to because of the nature of the challenge (which is not the case here). For instance, code golf submissions are programs or functions by default and you should not make assumptions about languages features. \$\endgroup\$ – Arnauld Dec 3 '20 at 13:25
  • \$\begingroup\$ Does this look better? \$\endgroup\$ – ExplorPython Jan 4 at 22:51
  • \$\begingroup\$ I'd be very surprised if this isn't a dupe. Personally, I'd consider it VTC-as-dupe worthy for any challenge that required you to count down from an input to 0, but until such a post is found, I'll VTRO \$\endgroup\$ – caird coinheringaahing Jan 5 at 0:14
  • 1
    \$\begingroup\$ @manatwork While either of those twists would make it new I don't think either of them would benefit the challenge at all. It's better to just come up with a new challenge than try to add a twist to a bad one. \$\endgroup\$ – Wheat Wizard Jan 5 at 17:23

10 Answers 10


Java (JDK), 92 79 78 bytes

v->{for(int i=11;i-->0;)System.out.println(i>0?"Liftoff in T-"+i:"LIFTOFF!");}

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Edit: Thanks to @KevinCruijssen for -1 byte

  • \$\begingroup\$ --i>=0 to i-->0 for -1 byte. :) \$\endgroup\$ – Kevin Cruijssen Dec 3 '20 at 13:57

APL (Dyalog Unicode), 36 bytes (SBCS)

Full program.

↑'Liftoff in T-'∘,∘⍕¨⌽⍳10

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ɩndices 1 through 10
 reverse them
¨ on each number, do:
 format as text
  , prepend
   the entirety of:
   'Liftoff in T-' this string
 merge list of strings into character matrix (and implicitly output to stdout)

'LIFTOFF!' this string (implicitly output it to stdout)

  • 3
    \$\begingroup\$ I've seen it before, but how do you even post an answer if the question is already closed.. It's closed 19 minutes ago, yet your answer is from 7 minutes ago.. :S \$\endgroup\$ – Kevin Cruijssen Dec 3 '20 at 13:56
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    \$\begingroup\$ Why is 0 included in the string? \$\endgroup\$ – vrintle Dec 3 '20 at 14:00
  • 4
    \$\begingroup\$ @KevinCruijssen, you can still post from the mobile app if you don't refresh first. \$\endgroup\$ – Shaggy Dec 3 '20 at 14:57
  • \$\begingroup\$ @vrintle Fixed. Thanks. \$\endgroup\$ – Adám Dec 3 '20 at 14:59

Python 2, 56 bytes

exec"'Liftoff in T-%d'%d;d-=1;print"*d+"'LIFTOFF!'"

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Wonderful application of Using exec to remove repeated print.

-1 thanks to dingledooper who realised we can reuse the d variable in the exec multiplier.

Python 2, 57 bytes

while d:print"Liftoff in T%d"%d;d+=1

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Python 2, 59 bytes

while d:print"Liftoff in T-%d"%d+1/d*"\nLIFTOFF!";d-=1

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  • \$\begingroup\$ Wonderful! I believe you can save one more byte Try it online! \$\endgroup\$ – dingledooper Jan 5 at 1:38
  • \$\begingroup\$ @dingledooper That's beautiful. Love it! \$\endgroup\$ – Sisyphus Jan 5 at 1:42

Ruby 2.7, 51 50 bytes

Saved a byte using ~9 for -10, thanks to Sisyphus!

puts (~9..-1).map{"Liftoff in T#{_1}"}<<"LIFTOFF!"

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TIO uses an older version of Ruby, whereas in Ruby 2.7, we've numbered parameters, which saves two bytes.

Ruby, 57 bytes

puts"Liftoff in T-#{11-($.+=1)}"while$.<10

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  • \$\begingroup\$ For the 51 character version better mention that uses Ruby 2.7 numbered block parameter, for people to know why it doesn't work on TIO's Ruby 2.5.5. \$\endgroup\$ – manatwork Jan 5 at 4:28
  • \$\begingroup\$ Thanks @manatwork, I really forgot to add it. \$\endgroup\$ – vrintle Jan 5 at 4:53
  • 1
    \$\begingroup\$ -10 -> ~9 for -1 byte \$\endgroup\$ – Sisyphus Jan 5 at 5:09
  • \$\begingroup\$ Nice, @Sisyphus ;-) \$\endgroup\$ – vrintle Jan 5 at 5:14

Perl 5, 43 bytes

say"Liftoff in T$_"for-10..-1;say'LIFTOFF!'

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PowerShell Core, 37 bytes

10..1|%{"Liftoff in T-$_"}

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Jelly, 25 24 bytes


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-1 byte thanks to caird


“ÞÆdḂbMG:ȯ»;Ɱ⁵ṚY⁷“KçÞ»Œu   Main niladic link
“ÞÆdḂbMG:ȯ»                "Liftoff in T-"
           ;               Join with
            Ɱ              each of
             ⁵             [1 to] 10
              Ṛ            Reverse
               Y           Join with newlines
                           Print and discard
                ⁷          Newline
                           Print and discard
                 “KçÞ»     "liftoff!"
                      Œu   Uppercase
  • 1
    \$\begingroup\$ -1 byte \$\endgroup\$ – caird coinheringaahing Jan 5 at 17:12
  • \$\begingroup\$ @cairdcoinheringaahing Thanks! I've been confused by unpaired nilads in links and I think this clears them up. \$\endgroup\$ – xigoi Jan 5 at 17:16
  • 1
    \$\begingroup\$ They're mainly very helpful if you just want to print and discard something :) \$\endgroup\$ – caird coinheringaahing Jan 5 at 17:17

Nim, 54 53 bytes

for i in -10..<0:echo "Liftoff in T",i

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-1 byte by using the negative numbers trick from other answers


Bash, 67 bytes

for i in `seq 10`;do echo Liftoff in T-$((11-i));done;echo LIFTOFF!

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Bash, 43 bytes

thanks to @Sisyphus for this suggestion.

seq -f'Liftoff in T%g' -10 -1;echo LIFTOFF!

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  • \$\begingroup\$ You're not supposed to include 0. \$\endgroup\$ – xigoi Jan 5 at 20:03
  • 1
    \$\begingroup\$ @xigoi yes, thanks for your point \$\endgroup\$ – Amir reza Riahi Jan 5 at 20:04
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    \$\begingroup\$ 43 bytes \$\endgroup\$ – Sisyphus Jan 7 at 8:51

05AB1E, 30 bytes

TFNT-“ƒŸ€† Tÿ“'µë™ì,}’µëƒŸ!’u,

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TFNT-“ƒŸ€† Tÿ“'µë™ì,}’µëƒŸ!’u,  # full program
 F                              # for N in [0, 1, 2, ...,
T                               # ..., 10...
 F                              # minus 1]...
                   ,            # print...
     “ƒŸ€† Tÿ“                  # "off in Tÿ"...
                                # (implicit) with ÿ replaced by...
  N                             # variable...
    -                           # minus...
   T                            # 10...
                  ì             # prepended with...
              'µë               # "lift"...
                 ™              # in title case...
                   ,            # with trailing newline
                    }           # end loop
                             ,  # print...
                     ’µëƒŸ!’    # "liftoff!"...
                            u   # in uppercase...
                             ,  # with trailing newline

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