Language: C++

#include<iostream>
#include<algorithm>
#include<vector>
#include<cmath>
#include<iterator>
using namespace std;

int main()
{
    vector<long long int> A;
    vector<long long int> B;
    vector<int> :: iterator it;
    long long int N, M, K, i, a, temp, len, ans=0;
    cin>>N>>M>>K;
    A.push_back(0);
    for(i=1;i<=N;i+=1)
    {
        cin>>a;
        A.push_back(A[i-1] + a);
    }
    B.push_back(0);
    for(i=1;i<=M;i+=1)
    {
        cin>>a;
        B.push_back(B[i-1] + a);
    }
    for(i=0;i<=N;i+=1)
    {
        if(A[i]>K)
        {
            break;
        }
        temp = K - A[i];
        it = lower_bound(B.begin(), B.end(), temp);
        if(it==B.end())
        {
            len = M;
        }
        len = it - B.begin();
        if(*(it)!=temp)
        {
            len-=1;
        }
        ans = max(ans, i+len);
    }
    cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:34:50: error: no match for 'operator=' (operand types are 'std::vector<int>::iterator' and '__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >')
   34 |         it = lower_bound(B.begin(), B.end(), temp);
      |                                                  ^
In file included from /usr/include/c++/14/string:48,
                 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,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_iterator.h:1038:11: note: candidate: 'constexpr __gnu_cxx::__normal_iterator<int*, std::vector<int> >& __gnu_cxx::__normal_iterator<int*, std::vector<int> >::operator=(const __gnu_cxx::__normal_iterator<int*, std::vector<int> >&)'
 1038 |     class __normal_iterator
      |           ^~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1038:11: note:   no known conversion for argument 1 from '__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >' to 'const __gnu_cxx::__normal_iterator<int*, std::vector<int> >&'
/usr/include/c++/14/bits/stl_iterator.h:1038:11: note: candidate: 'constexpr __gnu_cxx::__normal_iterator<int*, std::vector<int> >& __gnu_cxx::__normal_iterator<int*, std::vector<int> >::operator=(__gnu_cxx::__normal_iterator<int*, std::vector<int> >&&)'
/usr/include/c++/14/bits/stl_iterator.h:1038:11: note:   no known conversion for argument 1 from '__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >' to '__gnu_cxx::__normal_iterator<int*, std::vector<int> >&&'
a.cc:35:14: error: no match for 'operator==' (operand types are 'std::vector<int>::iterator' and 'std::vector<long long int>::iterator')
   35 |         if(it==B.end())
      |            ~~^~~~~~~~~
      |            |        |
      |            |        __normal_iterator<long long int*,vector<long long int>>
      |            __normal_iterator<int*,vector<int>>
In file included from /usr/include/c++/14/iosfwd:42,
                 from /usr/include/c++/14/ios:40:
/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:35:22: note:   'std::vector<int>::iterator' is not derived from 'const std::fpos<_StateT>'
   35 |         if(it==B.end())
      |                      ^
In file included from /usr/include/c++/14/string:43:
/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:35:22: note:   'std::vector<int>::iterator' is not derived from 'const std::allocator<_CharT>'
   35 |         if(it==B.end())
      |                      ^
/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:35:22: note:   'std::vector<int>::iterator' is not derived from 'const std::reverse_iterator<_Iterator>'
   35 |         if(it==B.end())
      |                      ^
/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:35:22: note:   'std::vector<int>::iterator' is not derived from 'const std::reverse_iterator<_Iterator>'
   35 |         if(it==B.end())
      |                      ^
/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:35:22: note:   'std::vector<int>::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
   35 |         if(it==B.end())
      |                      ^
/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:35:22: note:   'std::vector<int>::iterator' is not derived from 'const std::move_iterator<_IteratorL>'
   35 |         if(it==B.end())
      |                      ^
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:35:22: note:   'std::vector<int>::iterator' is not derived from 'const std::pair<_T1, _T2>'
   35 |         if(it==B.end())
      |                      ^
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:   template argument deduction/substitution failed:
a.cc:35:22: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   35 |         if(it==B.end())
      |                      ^
/usr/include/c++/14/string_view:637:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  637 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:637:5: note:   template argument deduction/substitution failed:
a.cc:35:22: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   35 |         if(it==B.end())
      |                      ^
/usr/include/c++/14/string_view:644:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  644 |     operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:644:5: note:   template argument deduction/substitution failed:
a.cc:35:22: note:   '__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   35 |         if(it==B.end())
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3755:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3755 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3755:5: note:   template argument deduction/substitution failed:
a.cc:35:22: note:   'std::vector<int>::iterator' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   35 |         if(it==B.end())
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3772:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3772 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3772:5: note:   template argument deduction/substitution failed:
a.cc:35:22: note:   'std::vector<int>::iterator' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   35 |         if(it==B.end())
      |                      ^
/usr/include/c++/14/bits/basic_string.h:3819:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3819 |     operator==(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3819:5: note:   template argument deduction/substitution failed:
a.cc:35:22: note:   mismatched types 'const _CharT*' and '__gnu_cxx::__normal_iterator<int*, std::vector<int> >'
   35 |         if(it==B.end())
      |                      ^
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/tuple:2558:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator==(const tupl