Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll long long int
main(){
  int N,X,c;
  cin>>N>>X;
  vector<long> x(N+1);
  for(int i=1;i<=N;i++)cin>>x[i];
  x[0]=0;
  ll res=x[N]+X;
  for(int i=N;i>0;i--){
    res+=(N-i+2)*(N-i+2)*(x[i]-x[i-1])+X;
  }
  c=res;
  //cout<<res<<endl; //(1): 1,3
  res=0;
  for(int i=1;i<=N;i++)res+=5*x[i]+2*X;
  //cout<<res<<endl; //(2): 2*, 4*
  c=min(c,res);
  res=0;
  for(int i=N;i>0;i--){
    if(i-1>0)res+=x[i]+X+4*(x[i]-x[i-1])+X+9*x[i-1]+X;
    else res+=5*x[i]+2*X;
  }
  //cout<<res<<endl; //(3)
  c=min(c,res);
  cout<<c<<endl;
}

Compiler output:
a.cc:4:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    4 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:19:8: error: no matching function for call to 'min(int&, long long int&)'
   19 |   c=min(c,res);
      |     ~~~^~~~~~~
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:1:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:19:8: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   19 |   c=min(c,res);
      |     ~~~^~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: 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:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:19:8: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   19 |   c=min(c,res);
      |     ~~~^~~~~~~
a.cc:26:8: error: no matching function for call to 'min(int&, long long int&)'
   26 |   c=min(c,res);
      |     ~~~^~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:26:8: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   26 |   c=min(c,res);
      |     ~~~^~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:26:8: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   26 |   c=min(c,res);
      |     ~~~^~~~~~~