/in/foo.cc: In function 'char gc()':
/in/foo.cc:10:21: error: 'maxs' was not declared in this scope
     static char buf[maxs],*p1=buf,*p2=buf;
                     ^~~~
/in/foo.cc:10:31: error: 'buf' was not declared in this scope
     static char buf[maxs],*p1=buf,*p2=buf;
                               ^~~
/in/foo.cc:11:16: error: 'p2' was not declared in this scope
     return p1==p2&&(p2=(p1=buf)+fread(buf,1,maxs,stdin),p1==p2)?EOF:*p1++;
                ^~