/in/foo.cc: In function 'int main()':
/in/foo.cc:27:21: error: expected primary-expression before 'long'
   27 |             time += long double(s[i]) / vmid;
      |                     ^~~~
/in/foo.cc:33:37: error: expected primary-expression before 'long'
   33 |             if (time < x[i]) time = long double(x[i]);
      |                                     ^~~~