Language: C

z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      | ^
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[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |          ^
main.c:1:15: error: type defaults to 'int' in declaration of 'b' [-Wimplicit-int]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |               ^
main.c:1:23: error: type defaults to 'int' in declaration of 'j' [-Wimplicit-int]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                       ^
main.c:1:25: error: type defaults to 'int' in declaration of 'm' [-Wimplicit-int]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                         ^
main.c:1:27: error: type defaults to 'int' in declaration of 'k' [-Wimplicit-int]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                           ^
main.c:1:29: error: type defaults to 'int' in declaration of 't' [-Wimplicit-int]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                             ^
main.c:1:31: error: type defaults to 'int' in declaration of 'i' [-Wimplicit-int]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                               ^
main.c:1:33: error: return type defaults to 'int' [-Wimplicit-int]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                                 ^~~~
main.c: In function 'main':
main.c:1:33: error: type of 'n' defaults to 'int' [-Wimplicit-int]
main.c:1:48: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                                                ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
main.c:1:48: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                                                ^~~~~
main.c:1:48: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:67: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                                                                   ^~~~~~
main.c:1:67: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:67: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:67: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:97: error: assignment to 'int' from 'int *' makes integer from pointer without a cast [-Wint-conversion]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                                                                                                 ^
main.c:1:105: error: assignment to 'int *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                                                                                                         ^
main.c:1:143: error: implicit declaration of function 'getch' [-Wimplicit-function-declaration]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                                                                                                                                               ^~~~~
main.c:1:154: error: implicit declaration of function 'fmin' [-Wimplicit-function-declaration]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                                                                                                                                                          ^~~~
main.c:1:1: note: include '<math.h>' or provide a declaration of 'fmin'
  +++ |+#include <math.h>
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
main.c:1:154: warning: incompatible implicit declaration of built-in function 'fmin' [-Wbuiltin-declaration-mismatch]
    1 | z[2002],*a=z,*b=z+999,j,m,k,t,i;main(n){for(;m=scanf("%d",&n)-++n;printf("%d\n",m))for(i=n;i--;j=a,a=b,b=j)for(j=n;j--;m<k?m=k:0)b[j]=k=n+~i&&getch()>45?fmin(t=a[j],t<k?t:k)+1:0;}
      |                                                                                                                                                          ^~~~
main.c:1:154: note: include '<math.h>' or provide a declaration of 'fmin'