Language: C

c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
main.c:1:9: error: type defaults to 'int' in declaration of 'd' [-Wimplicit-int]
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      |         ^
main.c:1:17: error: type defaults to 'int' in declaration of 'm' [-Wimplicit-int]
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      |                 ^
main.c:1:19: error: type defaults to 'int' in declaration of 'u' [-Wimplicit-int]
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      |                   ^
main.c:1:21: error: type defaults to 'int' in declaration of 'i' [-Wimplicit-int]
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      |                     ^
main.c:1:23: error: return type defaults to 'int' [-Wimplicit-int]
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      |                       ^
main.c: In function 'p':
main.c:1:23: error: type of 'z' defaults to 'int' [-Wimplicit-int]
main.c:1:31: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      |                               ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
main.c:1:31: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      |                               ^~~~~
main.c:1:31: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:37: error: 't' undeclared (first use in this function)
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      |                                     ^
main.c:1:37: note: each undeclared identifier is reported only once for each function it appears in
main.c:1:51: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      |                                                   ^~~~~~
main.c:1:51: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:51: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:51: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c: At top level:
main.c:1:64: error: return type defaults to 'int' [-Wimplicit-int]
    1 | c[5004],d[5004],m,u,i;p(z){u=~scanf(t="%d\n",z)||!printf(t,m);}main(t){for(p(c),p(d);i<*c;p(++i+c));for(;p(d);)for(u=i=t=0;i++<*c;t=d[i],d[i]=m<u?m=u:u)u=*d-c[i]?u:t+1;}
      |                                                                ^~~~
main.c: In function 'main':
main.c:1:64: error: type of 't' defaults to 'int' [-Wimplicit-int]