Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

long long N, K;
vector<long long> buildings;

long long build(long long now, long long back_building_height, long long increase_buildings){
    if(increase_buildings == K){
        return 0;
    }else if(N - now == K - increase_buildings){
        return max(0l, back_building_height + 1 - buildings[now]) + build(now + 1, max(back_building_height + 1, buildings[now]), increase_buildings + 1);
    }else{
        return min(max(0l, back_building_height + 1 - buildings[now]) + build(now + 1, max(back_building_height + 1, buildings[now]), increase_buildings + 1), build(now + 1, back_building_height, increase_buildings));
    }
}

int main(){
    cin >> N >> K;
    buildings.resize(N);
    for(int i = 0; i < N; i++){
        cin >> buildings[i];
    }
    cout << build(1, buildings[0], 1) << endl;
}


Compiler output:
a.cc: In function 'long long int build(long long int, long long int, long long int)':
a.cc:13:19: error: no matching function for call to 'max(long int, long long int)'
   13 |         return max(0l, back_building_height + 1 - buildings[now]) + build(now + 1, max(back_building_height + 1, buildings[now]), increase_buildings + 1);
      |                ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 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_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:13:19: note:   deduced conflicting types for parameter 'const _Tp' ('long int' and 'long long int')
   13 |         return max(0l, back_building_height + 1 - buildings[now]) + build(now + 1, max(back_building_height + 1, buildings[now]), increase_buildings + 1);
      |                ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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,
                 from a.cc:2:
/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:13:19: note:   mismatched types 'std::initializer_list<_Tp>' and 'long int'
   13 |         return max(0l, back_building_height + 1 - buildings[now]) + build(now + 1, max(back_building_height + 1, buildings[now]), increase_buildings + 1);
      |                ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:15:23: error: no matching function for call to 'max(long int, long long int)'
   15 |         return min(max(0l, back_building_height + 1 - buildings[now]) + build(now + 1, max(back_building_height + 1, buildings[now]), increase_buildings + 1), build(now + 1, back_building_height, increase_buildings));
      |                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:15:23: note:   deduced conflicting types for parameter 'const _Tp' ('long int' and 'long long int')
   15 |         return min(max(0l, back_building_height + 1 - buildings[now]) + build(now + 1, max(back_building_height + 1, buildings[now]), increase_buildings + 1), build(now + 1, back_building_height, increase_buildings));
      |                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:15:23: note:   mismatched types 'std::initializer_list<_Tp>' and 'long int'
   15 |         return min(max(0l, back_building_height + 1 - buildings[now]) + build(now + 1, max(back_building_height + 1, buildings[now]), increase_buildings + 1), build(now + 1, back_building_height, increase_buildings));
      |                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~