/in/foo.cc: In function 'int main()':
/in/foo.cc:29:5: error: expected ';' before 'for'
     for(int i=1;i<=n;i++){
     ^~~
/in/foo.cc:29:17: error: 'i' was not declared in this scope
     for(int i=1;i<=n;i++){
                 ^