Language: C++

#include<iostream>
#include<cstring>
#include<algorithm>
#include<vector>
#include<queue>
#include<cstring>
#include<cmath>
#include<memory.h>
#include<set>
#include<sstream>
#include<map>
using namespace std ;
#define ll long long 
#define all(x) x.begin() , x.end()
#define pb push_back
#define mp make_pair
const int N = 1001;
int n ;
ll sum1 , ll sum2 ,cnt , mx=-1;
vector<ll>v,an;
int main(){
 //  freopen("input.txt","r",stdin);
   scanf("%d",&n);
   v.resize(n);
   for(int i=0;i<n;++i)
   {
   	scanf("%d",v+i);
   	if((i+1)%2==0&&v[i]>0)sum1+=v[i];
   	if((i+1)%2!=0&&v[i]>0)sum2+=v[i];
   	if(v[i]<0)++cnt;
   	mx=max(mx,v[i]);
   }
   if(cnt==n)
   {
   	printf("%d\n",mx);
   	printf("%d\n", n-1);
   	while(v[0]!=mx)
   	{
   		printf("1\n");
   		v.erase(v.begin());
   	}
   	 while(v.size()>1)
   	 {
   	 	printf("%d\n",v.size());
   	 	v.pop_back();
   	 }
   	 return 0 ; 
   }
 if(sum2 < sum1)
 {
    an.pb(1);
    v.erase(v.begin());
    if((n-1)%2==0)
    {
    	an.pb(v.size());
    	v.pop_back();
    }
 }
 else if(sum1 < sum2)
 {
 	if(n%2==0){
 		an.pb(v.size());
 		v.pop_back();
 	}
 }
 while(v[0]<0)
 {
 	an.pb(1);
 	an.pb(1);
 	v.erase(v.begin());
 	v.erase(v.begin());
 }
 while(v[v.size()-1]<0)
 {
 	an.pb(v.size());
 	v.pop_back();
 	an.pb(v.size());
 	v.pop_back();
 }
  while(v.size()>2){
    if(v[2]>0){
      an.pb(2);
      v.erase(v.begin());
      v.erase(v.begin()+1);
    }else{
      an.pb(3);
      v.erase(v.begin()+3);
      v.erase(v.begin()+1);
    }
  }
 if(v.size()==2){
    an.push_back(2);
  }
  printf("%d\n",mx(sum1,sum2));
  printf("%d\n",(int)an.size());
  for(int i=0;i<an.size();++i)
  	printf("%d\n",an[i]);
}

Compiler output:
a.cc:13:12: error: expected unqualified-id before 'long'
   13 | #define ll long long
      |            ^~~~
a.cc:19:11: note: in expansion of macro 'll'
   19 | ll sum1 , ll sum2 ,cnt , mx=-1;
      |           ^~
a.cc: In function 'int main()':
a.cc:27:21: error: no match for 'operator+' (operand types are 'std::vector<long long int>' and 'int')
   27 |         scanf("%d",v+i);
      |                    ~^~
      |                    | |
      |                    | int
      |                    std::vector<long long int>
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:627:5: note: candidate: 'template<class _Iterator> constexpr std::reverse_iterator<_Iterator> std::operator+(typename reverse_iterator<_Iterator>::difference_type, const reverse_iterator<_Iterator>&)'
  627 |     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:627:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note: candidate: 'template<class _Iterator> constexpr std::move_iterator<_IteratorL> std::operator+(typename move_iterator<_IteratorL>::difference_type, const move_iterator<_IteratorL>&)'
 1798 |     operator+(typename move_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   27 |         scanf("%d",v+i);
      |                      ^
In file included from /usr/include/c++/14/string:54:
/usr/include/c++/14/bits/basic_string.h:3598:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3598 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3598:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   'std::vector<long long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3616:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3616 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3616:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   mismatched types 'const _CharT*' and 'std::vector<long long int>'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3635:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3635 |     operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3635:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3652:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3652 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3652:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   'std::vector<long long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3670:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, _CharT)'
 3670 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3670:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   'std::vector<long long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3682:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3682 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3682:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   'std::vector<long long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3689:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3689 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3689:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   'std::vector<long long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3696:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3696 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3696:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   'std::vector<long long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3719:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3719 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3719:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   mismatched types 'const _CharT*' and 'std::vector<long long int>'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3726:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3726 |     operator+(_CharT __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3726:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3733:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const _CharT*)'
 3733 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3733:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   'std::vector<long long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   27 |         scanf("%d",v+i);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3740:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, _CharT)'
 3740 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3740:5: note:   template argument deduction/substitution failed:
a.cc:27:22: note:   'std::vector<long long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   27 |         scanf("%d",v+i);
      |                      ^
a.cc:29:31: error: 'sum2' was not declared in this scope; did you mean 'sum1'?
   29 |         if((i+1)%2!=0&&v[i]>0)sum2+=v[i];
      |                               ^~~~
      |                               sum1
a.cc:30:21: error: 'cnt' was not declared in this scope; did you mean 'int'?
   30 |         if(v[i]<