Language: C++

#include<bits/stdc++.h>
#include<deque>
#include<iomanip>
using namespace std;
int main(){
  int n; cin >> n;
  vector<long> a(0), b(0);
  long s;

  for(int i = 0; i < n; i++){
    cin >> a[i];

    if((n + i) % 2 == 0){
      b.push_back(a[i]);
    } else {
      b.insert(b.begin(), a);
    }
  }

  for(int i = 0; i < n; i++){
    cout << b[i] << " ";
  }
  cout << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:15: error: no matching function for call to 'std::vector<long int>::insert(std::vector<long int>::iterator, std::vector<long int>&)'
   16 |       b.insert(b.begin(), a);
      |       ~~~~~~~~^~~~~~~~~~~~~~
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:1484:9: note: candidate: 'template<class _InputIterator, class> std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::insert(const_iterator, _InputIterator, _InputIterator) [with <template-parameter-2-2> = _InputIterator; _Tp = long int; _Alloc = std::allocator<long int>]'
 1484 |         insert(const_iterator __position, _InputIterator __first,
      |         ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:1484:9: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/vector:72:
/usr/include/c++/14/bits/vector.tcc:133:5: note: candidate: 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::insert(const_iterator, const value_type&) [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator; const_iterator = std::vector<long int>::const_iterator; value_type = long int]'
  133 |     vector<_Tp, _Alloc>::
      |     ^~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/vector.tcc:135:57: note:   no known conversion for argument 2 from 'std::vector<long int>' to 'const std::vector<long int>::value_type&' {aka 'const long int&'}
  135 |     insert(const_iterator __position, const value_type& __x)
      |                                       ~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:1395:7: note: candidate: 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::insert(const_iterator, value_type&&) [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator; const_iterator = std::vector<long int>::const_iterator; value_type = long int]'
 1395 |       insert(const_iterator __position, value_type&& __x)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:1395:54: note:   no known conversion for argument 2 from 'std::vector<long int>' to 'std::vector<long int>::value_type&&' {aka 'long int&&'}
 1395 |       insert(const_iterator __position, value_type&& __x)
      |                                         ~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:1413:7: note: candidate: 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::insert(const_iterator, std::initializer_list<_Tp>) [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator; const_iterator = std::vector<long int>::const_iterator]'
 1413 |       insert(const_iterator __position, initializer_list<value_type> __l)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:1413:70: note:   no known conversion for argument 2 from 'std::vector<long int>' to 'std::initializer_list<long int>'
 1413 |       insert(const_iterator __position, initializer_list<value_type> __l)
      |                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:1439:7: note: candidate: 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::insert(const_iterator, size_type, const value_type&) [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator; const_iterator = std::vector<long int>::const_iterator; size_type = long unsigned int; value_type = long int]'
 1439 |       insert(const_iterator __position, size_type __n, const value_type& __x)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:1439:7: note:   candidate expects 3 arguments, 2 provided