Language: C

h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'h' [-Wimplicit-int]
main.c:1:3: error: type defaults to 'int' in declaration of 'b' [-Wimplicit-int]
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
      |   ^
main.c:1:5: error: type defaults to 'int' in declaration of 'v' [-Wimplicit-int]
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
      |     ^
main.c:1:9: error: type defaults to 'int' in declaration of 'n' [-Wimplicit-int]
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
      |         ^
main.c:1:11: error: return type defaults to 'int' [-Wimplicit-int]
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
      |           ^~~~
main.c: In function 'main':
main.c:1:11: error: type of 'i' defaults to 'int' [-Wimplicit-int]
main.c:1:25: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
      |                         ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
main.c:1:25: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
      |                         ^~~~~
main.c:1:25: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:50: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
      |                                                  ^~~~~~
main.c:1:50: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:50: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:50: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:101: error: lvalue required as left operand of assignment
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
      |                                                                                                     ^~
main.c: At top level:
main.c:1:5: warning: array 'v' assumed to have one element
    1 | h,b,v[],n;main(i){for(;~scanf("%d",v+n%8);++n%8||printf("%d %d\n",h,b))for(h=b=0,i=16;i--;)(i%5?b:h)+=v[i%4]==v[4+i/4];}
      |     ^