/in/foo.cc: In function 'bool hui(long long int)':
/in/foo.cc:5:8: error: 'n' was not declared in this scope
  int i=n,m=0;
        ^
/in/foo.cc:7:3: error: 'm' was not declared in this scope
   m=m*10+i%10;
   ^
/in/foo.cc:10:12: error: 'm' was not declared in this scope
  return n==m;
            ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:17:4: error: 'sum' was not declared in this scope
    sum++;
    ^~~
/in/foo.cc:20:5: error: 'sum' was not declared in this scope
  if(sum==0){
     ^~~
/in/foo.cc:24:8: error: 'sum' was not declared in this scope
  cout<<sum<<endl;
        ^~~