Language: C++

#include<iostream>
#include<string>
#include <bits/stdc++.h>
#include<vector>
#include <algorithm>
#include <functional>
#include <cmath>
#include <math.h>
#include <iomanip>
#include <stdlib.h>
#include <stdio.h>
using namespace std;
using ll = long long;

string itoc(int a){
  switch(a){
    case 1: return "a";
    case 2: return "b";
    case 3: return "c";
    case 4: return "d";
    case 5: return "e";
    case 6: return "f";
    case 7: return "g";
    case 8: return "h";
    case 9: return "i";
    case 10: return "j";
    case 11: return "k";
    case 12: return "l";
    case 13: return "m";
    case 14: return "n";
    case 15: return "o";
    case 16: return "p";
    case 17: return "q";
    case 18: return "r";
    case 19: return "s";
    case 20: return "t";
    case 21: return "u";
    case 22: return "v";
    case 23: return "w";
    case 24: return "x";
    case 25: return "y";
    case 0: return "z";
  }
}

int main(){
  ll n,m,l;
  int i;
  vector<int> p;
  vector<string> c;
  string ans;
  cin >> n;
  m=n;
  l=n;
  for(i=0;i<=100;i++){
    if(l==0){
      break;
    }

    m = l % 26;
    l = l / 26;

    c.push_back(itoc(m));

  }
  if(c.end() == 0){
    c.erase(c.end());
  }
  reverse(c.begin(),c.end());

  for(i=0;i<c.size();i++){

    ans += c[i];
  }
  cout << ans << endl;


  return 0;


}


Compiler output:
a.cc: In function 'int main()':
a.cc:66:14: error: no match for 'operator==' (operand types are 'std::vector<std::__cxx11::basic_string<char> >::iterator' and 'int')
   66 |   if(c.end() == 0){
      |      ~~~~~~~ ^~ ~
      |           |     |
      |           |     int
      |           std::vector<std::__cxx11::basic_string<char> >::iterator
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:3:
/usr/include/c++/14/bits/regex.h:1103:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1103 |     operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1103:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   66 |   if(c.end() == 0){
      |                 ^
/usr/include/c++/14/bits/regex.h:1199:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator==(__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const sub_match<_BiIter>&)'
 1199 |     operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1199:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   66 |   if(c.end() == 0){
      |                 ^
/usr/include/c++/14/bits/regex.h:1274:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator==(const sub_match<_BiIter>&, __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)'
 1274 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1274:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   66 |   if(c.end() == 0){
      |                 ^
/usr/include/c++/14/bits/regex.h:1366:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1366 |     operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1366:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   66 |   if(c.end() == 0){
      |                 ^
/usr/include/c++/14/bits/regex.h:1441:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1441 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1441:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   66 |   if(c.end() == 0){
      |                 ^
/usr/include/c++/14/bits/regex.h:1534:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1534 |     operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1534:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   66 |   if(c.end() == 0){
      |                 ^
/usr/include/c++/14/bits/regex.h:1613:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1613 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1613:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   66 |   if(c.end() == 0){
      |                 ^
/usr/include/c++/14/bits/regex.h:2186:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator==(const match_results<_BiIter, _Alloc>&, const match_results<_BiIter, _Alloc>&)'
 2186 |     operator==(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:2186:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   66 |   if(c.end() == 0){
      |                 ^
In file included from /usr/include/c++/14/iosfwd:42,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::fpos<_StateT>'
   66 |   if(c.end() == 0){
      |                 ^
In file included from /usr/include/c++/14/string:43,
                 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:
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)'
  235 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:235:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::allocator<_CharT>'
   66 |   if(c.end() == 0){
      |                 ^
In file included from /usr/include/c++/14/string:48:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::reverse_iterator<_Iterator>'
   66 |   if(c.end() == 0){
      |                 ^
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::reverse_iterator<_Iterator>'
   66 |   if(c.end() == 0){
      |                 ^
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
   66 |   if(c.end() == 0){
      |                 ^
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
   66 |   if(c.end() == 0){
      |                 ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:66:17: note:   'std::vector<std::__cxx11::basic_string<char> >::iterator' is not derived from 'const std::pair<_T1, _T2>'
   66 |   if(c.end() == 0){
      |                 ^
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:629:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  629 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:629:5: note:   tem