Language: C++

// 簡易競プロテンプレ
#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll n, k;
ll a[114514];
int main(void){
 cin >> n >> k;
 for(int i=0;i<n;i++) cin >> a[i];
 ll ans = 0, ans2 = 0;
 for(int i=0;i<n;i++){
  if (i>=k && a[i]>0) ans += a[i];
  if (i<k) ans += a[i];
  if (i+1==k) ans = max(ans, 0);
 }
 for(int i=n-1;i>=0;i--){
  if (i<n-k && a[i]>0) ans2 += a[i];
  if (i>=n-k) ans2 += a[i];
  if (i==n-k) ans2 = max(ans2, 0);
 } 
 cout << max(ans, ans2) << endl;
 return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:24: error: no matching function for call to 'max(long long int&, int)'
   14 |   if (i+1==k) ans = max(ans, 0);
      |                     ~~~^~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:14:24: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   14 |   if (i+1==k) ans = max(ans, 0);
      |                     ~~~^~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:14:24: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   14 |   if (i+1==k) ans = max(ans, 0);
      |                     ~~~^~~~~~~~
a.cc:19:25: error: no matching function for call to 'max(long long int&, int)'
   19 |   if (i==n-k) ans2 = max(ans2, 0);
      |                      ~~~^~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:19:25: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   19 |   if (i==n-k) ans2 = max(ans2, 0);
      |                      ~~~^~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:19:25: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   19 |   if (i==n-k) ans2 = max(ans2, 0);
      |                      ~~~^~~~~~~~~