reversed-c, 89 bytes

Result

AC

Duration

681ms

Code [DL]

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

Disassembly

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

stdin

63576359179381871784095407363502474030565828601390579876543210983406083501234567896401267071853590683

stdout

0110011011010100110010001010101110010110101001110111000000000100101010101111111110001111010100110110

stderr

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

strace