/in/foo.cc:1:1: error: 'include' does not name a type
 include <cstdio> include <iostream> include <cmath>
 ^~~~~~~
/in/foo.cc: In function 'void prep()':
/in/foo.cc:14:14: error: 'scanf' was not declared in this scope
 scanf("%d",&n);
              ^
/in/foo.cc: In function 'void sear()':
/in/foo.cc:42:15: error: 'printf' was not declared in this scope
 printf("%d",co);
               ^