foo.cc: In function 'int main()':
foo.cc:19:53: error: expected ')' before ';' token
   19 |                         ans.push_back(min(a[l],a[r]);
      |                                      ~              ^
      |                                                     )
foo.cc:20:49: error: expected ')' before ';' token
   20 |                     ans.push_back(max(a[l],a[r]);
      |                                  ~              ^
      |                                                 )
foo.cc:24:32: error: 'class std::vector<int>' has no member named 'pb'
   24 |                            ans.pb(a[l]);
      |                                ^~
foo.cc:28:32: error: 'class std::vector<int>' has no member named 'pb'
   28 |                            ans.pb(a[r]);
      |                                ^~
foo.cc:32:44: error: expected ';' before 'cout'
   32 |         if(is_sorted(ans.begin(),ans.end())cout<<"YES"<<endl;
      |                                            ^~~~
      |                                            ;
foo.cc:33:20: error: expected primary-expression before 'else'
   33 |                    else cout<<"NO"<<endl;
      |                    ^~~~
foo.cc:32:62: error: expected ')' before 'else'
   32 |         if(is_sorted(ans.begin(),ans.end())cout<<"YES"<<endl;
      |           ~                                                  ^
      |                                                              )
   33 |                    else cout<<"NO"<<endl;
      |                    ~~~~