/in/foo.cc: In function 'int main()':
/in/foo.cc:11:30: error: expected primary-expression before ')' token
  sort(app+1,app+n+1,less<int>);
                              ^
/in/foo.cc:12:28: error: expected primary-expression before ')' token
  sort(tt+1,tt+m+1,less<int>);
                            ^