reversed-c, 85 bytes

Result

AC

Duration

689ms

Code [DL]

{؛(b/d+8ᔭ)ɹɐɥɔʇnd⅋⅋b(d=b؛91⅋(()ɹɐɥɔʇǝƃ=d)؛)ɹoɟ}(d)uıɐɯ؛b

Disassembly

q;main(p){for(;(p=getchar())&16;q=p)q&&putchar(48+p/q);}

stdin

24269790768763585987654321027089549684832671343654196736012862536851570610427175385780123456789246973

stdout

1011010101000110100000000011011001010100110110100010101011100101100110100101010010110111111111011100

stderr

/tmp/code.c:1:1: warning: data definition has no type or storage class
 q;main(p){for(;(p=getchar())&16;q=p)q&&putchar(48+p/q);}
 ^
/tmp/code.c:1:1: warning: type defaults to 'int' in declaration of 'q' [-Wimplicit-int]
/tmp/code.c:1:3: warning: return type defaults to 'int' [-Wimplicit-int]
 q;main(p){for(;(p=getchar())&16;q=p)q&&putchar(48+p/q);}
   ^~~~
/tmp/code.c: In function 'main':
/tmp/code.c:1:3: warning: type of 'p' defaults to 'int' [-Wimplicit-int]
/tmp/code.c:1:19: warning: implicit declaration of function 'getchar' [-Wimplicit-function-declaration]
 q;main(p){for(;(p=getchar())&16;q=p)q&&putchar(48+p/q);}
                   ^~~~~~~
/tmp/code.c:1:40: warning: implicit declaration of function 'putchar' [-Wimplicit-function-declaration]
 q;main(p){for(;(p=getchar())&16;q=p)q&&putchar(48+p/q);}
                                        ^~~~~~~
/tmp/code.c:1:38: warning: value computed is not used [-Wunused-value]
 q;main(p){for(;(p=getchar())&16;q=p)q&&putchar(48+p/q);}
                                      ^~

strace