Language: C

z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'z' [-Wimplicit-int]
main.c:1:10: error: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |          ^
main.c:1:15: error: type defaults to 'int' in declaration of 'b' [-Wimplicit-int]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |               ^
main.c:1:24: error: type defaults to 'int' in declaration of 'm' [-Wimplicit-int]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                        ^
main.c:1:26: error: type defaults to 'int' in declaration of 'i' [-Wimplicit-int]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                          ^
main.c:1:28: error: type defaults to 'int' in declaration of 'j' [-Wimplicit-int]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                            ^
main.c:1:30: error: return type defaults to 'int' [-Wimplicit-int]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                              ^~~~
main.c: In function 'main':
main.c:1:30: error: type of 'n' defaults to 'int' [-Wimplicit-int]
main.c:1:43: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                                           ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
main.c:1:43: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                                           ^~~~~
main.c:1:43: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:62: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                                                              ^~~~~~
main.c:1:62: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:62: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:62: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:83: error: implicit declaration of function 'memset' [-Wimplicit-function-declaration]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                                                                                   ^~~~~~
main.c:1:1: note: include '<string.h>' or provide a declaration of 'memset'
  +++ |+#include <string.h>
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
main.c:1:83: warning: incompatible implicit declaration of built-in function 'memset' [-Wbuiltin-declaration-mismatch]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                                                                                   ^~~~~~
main.c:1:83: note: include '<string.h>' or provide a declaration of 'memset'
main.c:1:112: error: invalid operands to binary ^ (have 'int *' and 'int *')
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                                                                                                                ^~
main.c:1:134: error: implicit declaration of function 'fmax' [-Wimplicit-function-declaration]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                                                                                                                                      ^~~~
main.c:1:1: note: include '<math.h>' or provide a declaration of 'fmax'
  +++ |+#include <math.h>
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
main.c:1:134: warning: incompatible implicit declaration of built-in function 'fmax' [-Wbuiltin-declaration-mismatch]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                                                                                                                                      ^~~~
main.c:1:134: note: include '<math.h>' or provide a declaration of 'fmax'
main.c:1:146: error: implicit declaration of function 'getchar' [-Wimplicit-function-declaration]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                                                                                                                                                  ^~~~~~~
main.c:1:146: note: 'getchar' is defined in header '<stdio.h>'; this is probably fixable by adding '#include <stdio.h>'
main.c:1:163: error: implicit declaration of function 'fmin' [-Wimplicit-function-declaration]
    1 | z[4000],*a=z,*b=z+2000,m,i,j;main(n){for(;scanf("%d",&n),i=n;printf("%d\n",m))for(memset(a,m=0,8e3);i--;a^=b^=a^=b)for(j=0;j++<=n;)m=fmax(m,b[j]=getchar()-46?0:1+fmin(fmin(b[j-1],a[j-1]),a[j]));}
      |                                                                                                                                                                   ^~~~
main.c:1:163: note: include '<math.h>' or provide a declaration of 'fmin'
main.c:1:163: warning: incompatible implicit declaration of built-in function 'fmin' [-Wbuiltin-declaration-mismatch]
main.c:1:163: note: include '<math.h>' or provide a declaration of 'fmin'