/in/foo.cc: In function 'long long int solve(long long int)':
/in/foo.cc:14:9: warning: 'emm' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return emm;
         ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:11:6: warning: 'emm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   emm+=a%10;
   ~~~^~~~~~
/in/foo.cc:8:12: note: 'emm' was declared here
  long long emm;
            ^~~