Language: C++

#include<iostream>
#include<string>
#include<algorithm>
#include<map>
#include<vector>
#include<cmath>
#include<cstdio>
#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)
#define pb(in,tmp) in.push_back(tmp)
#define all(in) in.begin(),in.end()
const double PI=acos(-1);
using namespace std;
int main(){
  int n;
  while(cin>>n,n){
    vector<int>(n);
    rep(i,n)cin>>in[i];
    int max=0;
    rep(i,n){
      int sum=0;
      loop(j,i,n){
	sum+=in[j];
	if(max<sum)max=sum;
      }
    }
    cout<<max<<endl;
  }


}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:34: error: no match for 'operator<' (operand types are 'int' and 'std::vector<int>')
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                  ^
a.cc:9:18: note: in expansion of macro 'loop'
    9 | #define rep(i,a) loop(i,0,a)
      |                  ^~~~
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
In file included from /usr/include/c++/14/string:48,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_iterator.h:448:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  448 |     operator<(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:448:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  493 |     operator<(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1694 |     operator<(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1760 |     operator<(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1045:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1045 |     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1045:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:673:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  673 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:673:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
/usr/include/c++/14/string_view:680:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  680 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:680:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
/usr/include/c++/14/string_view:688:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  688 |     operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:688:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   'std::vector<int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3874 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3888 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
/usr/include/c++/14/bits/basic_string.h:3901:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3901 |     operator<(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3901:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'const _CharT*' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |                                   ^
a.cc:18:5: note: in expansion of macro 'rep'
   18 |     rep(i,n)cin>>in[i];
      |     ^~~
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/tuple:2600:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator<(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2600 |     operator<(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2600:5: note:   template argument deduction/substitution failed:
a.cc:18:11: note:   mismatched types 'const std::tuple<_UTypes ...>' and 'int'
   18 |     rep(i,n)cin>>in[i];
      |           ^
a.cc:8:35: note: in definition of macro 'loop'
    8 | #define loop(i,a,b) for(int i=a;i<b;i++)
      |