/in/foo.cc: In function 'int main()':
/in/foo.cc:31:9: warning: unused variable 'q' [-Wunused-variable]
    node*q=head;
         ^
/in/foo.cc:35:18: error: break statement not within loop or switch
    cout<<head->x;break;
                  ^~~~~
/in/foo.cc:12:6: warning: unused variable 'a' [-Wunused-variable]
  int a[10000]={0};
      ^
/in/foo.cc:22:6: warning: unused variable 'i' [-Wunused-variable]
  int i=0;int t=0;
      ^
/in/foo.cc: At global scope:
/in/foo.cc:37:1: error: expected declaration before '}' token
 }
 ^