Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int n;
  
  cin >> n;
  vector<int64_t> ryuka(int n);
  for(i=0;i<n;i++){
    ryuka.at(0)=2;
    ryuka.at(1)=1;
    ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
  }


  cout << ryuka.at(n-1) << endl;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:8:7: error: 'i' was not declared in this scope
    8 |   for(i=0;i<n;i++){
      |       ^
a.cc:9:11: error: request for member 'at' in 'ryuka', which is of non-class type 'std::vector<long int>(int)'
    9 |     ryuka.at(0)=2;
      |           ^~
a.cc:10:11: error: request for member 'at' in 'ryuka', which is of non-class type 'std::vector<long int>(int)'
   10 |     ryuka.at(1)=1;
      |           ^~
a.cc:11:11: error: request for member 'at' in 'ryuka', which is of non-class type 'std::vector<long int>(int)'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |           ^~
a.cc:11:29: error: no match for 'operator+' (operand types are 'std::vector<long int>' and 'std::vector<long int>')
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                   ~~~~~~~~~~^~~~~~~~~~~
      |                        |          |
      |                        |          vector<[...]>
      |                        vector<[...]>
In file included from /usr/include/c++/14/bits/stl_algobase.h:67,
                 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_iterator.h:627:5: note: candidate: 'template<class _Iterator> constexpr std::reverse_iterator<_Iterator> std::operator+(typename reverse_iterator<_Iterator>::difference_type, const reverse_iterator<_Iterator>&)'
  627 |     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:627:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note: candidate: 'template<class _Iterator> constexpr std::move_iterator<_IteratorL> std::operator+(typename move_iterator<_IteratorL>::difference_type, const move_iterator<_IteratorL>&)'
 1798 |     operator+(typename move_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'const std::move_iterator<_IteratorL>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/basic_string.h:3598:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3598 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3598:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3616:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3616 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3616:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   mismatched types 'const _CharT*' and 'std::vector<long int>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3635:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3635 |     operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3635:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3652:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3652 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3652:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3670:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, _CharT)'
 3670 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3670:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3682:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3682 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3682:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3689:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3689 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3689:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3696:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3696 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3696:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3719:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3719 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3719:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   mismatched types 'const _CharT*' and 'std::vector<long int>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3726:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3726 |     operator+(_CharT __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3726:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3733:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const _CharT*)'
 3733 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3733:5: note:   template argument deduction/substitution failed:
a.cc:11:39: note:   'std::vector<long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   11 |     ryuka.at(n-1)=ryuka(n-2)+ryuka(n-3);
      |                                       ^
/usr/include/c++/14/bits/basic_string.h:3740:5: note: candidate: