Language: C++

#include <bits/stdc++.h>
using namespace std;

#define int        long long
// #define mp      make_pair
#define eb         emplace_back
#define pb         push_back
#define ss         second
#define ff         first
#define IOS        ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define mod        998244353
#define MOD        (1000*1000*1000+7)
#define MN         LLONG_MIN
#define MX         LLONG_MAX
#define v1d        vector<int>
#define v2d        vector<vector<int>>
#define vip        vector<pair<int,int> >
#define v1s        vector<string>
#define pa         pair<int,int>
#define mxpq(T)    priority_queue <T>
#define mnpq(T)    priority_queue<T,vector<T>,greater<T>>
#define print(v)   for(auto i:v)cout<<i<<" ";cout<<"\n";
#define p2d(v)     for(auto a:v){for(auto b:a)cout<<b<<" ";cout<<endl;}
#define p1d(v)     for(auto a:v)cout<<a<<" ";cout<<endl;
#define ppd(v)     for(auto a:v)cout<<a.ff<<" "<<a.ss<<endl;
#define endl       "\n"
#define input(b,n) for(int i=0;i<n;i++)cin>>b[i];
#define Sort(v)    sort(v.begin(),v.end())
#define RSort(v)   sort(v.rbegin(),v.rend())
#define all(v)     v.begin(),v.end()
int gcd(int a,int b){return b?gcd(b,a%b):a;}
//string s = bitset<64>(a).to_string();

void vrikodara(int n=12){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cout<<setprecision(n)<<fixed;
    // #ifndef ONLINE_JUDGE
    //      freopen("input.txt",  "r",  stdin);
    //      freopen("output.txt", "w", stdout);
    // #endif
}

//____________________________________________________________________________________

v1d dp(3005,v1d(3005,-1));

int fun(v1d &v,int n,int i,int j){
    if(dp[i][j] != -1)return dp[i][j];
    if(i == j)return dp[i][j] = v[i];
    dp[i][j] = max(v[i]-fun(v,n,i+1,j), v[j]-fun(v,n,i,j-1));
    return dp[i][j];
}

void solve(){
    int n,k;cin>>n;
    v1d v(n+2);
    for(int i=0;i<n;i++)cin>>v[i+1];
    cout<<fun(v,n,1,n);
}

int32_t main(){
    vrikodara();
    int t = 1;
    // cin>>t;
    while(t--){
        solve();
    }
    


    return 0;
}

Compiler output:
a.cc:45:25: error: no matching function for call to 'std::vector<long long int>::vector(int, std::vector<long long int>)'
   45 | v1d dp(3005,v1d(3005,-1));
      |                         ^
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_vector.h:707:9: note: candidate: 'template<class _InputIterator, class> std::vector<_Tp, _Alloc>::vector(_InputIterator, _InputIterator, const allocator_type&) [with <template-parameter-2-2> = _InputIterator; _Tp = long long int; _Alloc = std::allocator<long long int>]'
  707 |         vector(_InputIterator __first, _InputIterator __last,
      |         ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:707:9: note:   template argument deduction/substitution failed:
a.cc:45:25: note:   deduced conflicting types for parameter '_InputIterator' ('int' and 'std::vector<long long int>')
   45 | v1d dp(3005,v1d(3005,-1));
      |                         ^
/usr/include/c++/14/bits/stl_vector.h:678:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::initializer_list<_Tp>, const allocator_type&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; allocator_type = std::allocator<long long int>]'
  678 |       vector(initializer_list<value_type> __l,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:678:43: note:   no known conversion for argument 1 from 'int' to 'std::initializer_list<long long int>'
  678 |       vector(initializer_list<value_type> __l,
      |              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:659:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, std::__type_identity_t<_Alloc>&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; std::__type_identity_t<_Alloc> = std::allocator<long long int>]'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:659:23: note:   no known conversion for argument 1 from 'int' to 'std::vector<long long int>&&'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |              ~~~~~~~~~^~~~
/usr/include/c++/14/bits/stl_vector.h:640:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::false_type) [with _Tp = long long int; _Alloc = std::allocator<long long int>; allocator_type = std::allocator<long long int>; std::false_type = std::false_type]'
  640 |       vector(vector&& __rv, const allocator_type& __m, false_type)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:640:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_vector.h:635:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::true_type) [with _Tp = long long int; _Alloc = std::allocator<long long int>; allocator_type = std::allocator<long long int>; std::true_type = std::true_type]'
  635 |       vector(vector&& __rv, const allocator_type& __m, true_type) noexcept
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:635:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_vector.h:624:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&, std::__type_identity_t<_Alloc>&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; std::__type_identity_t<_Alloc> = std::allocator<long long int>]'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:624:28: note:   no known conversion for argument 1 from 'int' to 'const std::vector<long long int>&'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |              ~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&) [with _Tp = long long int; _Alloc = std::allocator<long long int>]'
  620 |       vector(vector&&) noexcept = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:601:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = long long int; _Alloc = std::allocator<long long int>]'
  601 |       vector(const vector& __x)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:601:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:569:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const value_type&, const allocator_type&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; size_type = long unsigned int; value_type = long long int; allocator_type = std::allocator<long long int>]'
  569 |       vector(size_type __n, const value_type& __value,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:569:47: note:   no known conversion for argument 2 from 'std::vector<long long int>' to 'const std::vector<long long int>::value_type&' {aka 'const long long int&'}
  569 |       vector(size_type __n, const value_type& __value,
      |                             ~~~~~~~~~~~~~~~~~~^~~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const allocator_type&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; size_type = long unsigned int; allocator_type = std::allocator<long long int>]'
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:51: note:   no known conversion for argument 2 from 'std::vector<long long int>' to 'const std::vector<long long int>::allocator_type&' {aka 'const std::allocator<long long int>&'}
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |                             ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const allocator_type&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; allocator_type = std::allocator<long long int>]'
  542 |       vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:531:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector() [with _Tp = long long int; _Alloc = std::allocator<long long int>]'
  531 |       vector() = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:531:7: note:   candidate expects 0 arguments, 2 provided
a.cc: In function 'long long int fun(std::vector<long long int>&, long long int, long long int, long long int)':
a.cc:48:13: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type {aka long long int}[long long int]' for array subscript
   48 |     if(dp[i][j] != -1)return dp[i][j];
      |             ^
a.cc:48:35: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type {aka long long int}[long long int]' for array subscript
   48 |     if(dp[i][j] != -1)return dp[i][j];
      |                                   ^
a.cc:49:27: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type {aka long long int}[long long int]' for array subscript
   49 |     if(i == j)return dp[i][j] = v[i];
      |                           ^
a.cc:50:10: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type {aka long long int}[long long int]' for array subscript
   50 |     dp[i][j] = max(v[i]-fun(v,n,i+1,j), v[j]-fun(v,n,i,j-1));
      |          ^
a.cc:51:17: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type {aka long long int}[long long int]' for array subscript
   51 |     return dp[i][j];
      |                 ^