Language: C++

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
    vector<long long >v1;
    vector<long long >v2;
    int n,m;
    long long k;
    cin >> n >> m >> k;
    long long sum  = 0,num;
    for(int i=0;i<n;i++){
        cin >> num ;
        sum+=num;
        v1.push_back(sum);
        //cout << sum << endl;
    }
    sum=0;
    for(int i=0;i<m;i++){
        cin >> num ;
        sum+=num;
        v2.push_back(sum);
    }
    int ans = upper_bound(v2.begin(),v2.end(),k)-v2.begin();
    for(int i=0;i<n;i++){
        //cout << 1+i+(upper_bound(v2.begin(),v2.end(),k-v1[i])-v2.begin()) <<endl;
        if(v1[i]<=k){
            ans = max(ans,1+i+(upper_bound(v2.begin(),v2.end(),k-v1[i])-v2.begin()));
        }
    }
    cout<< ans <<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:30:22: error: no matching function for call to 'max(int&, __gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >::difference_type)'
   30 |             ans = max(ans,1+i+(upper_bound(v2.begin(),v2.end(),k-v1[i])-v2.begin()));
      |                   ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 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_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:30:22: note:   deduced conflicting types for parameter 'const _Tp' ('int' and '__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >::difference_type' {aka 'long int'})
   30 |             ans = max(ans,1+i+(upper_bound(v2.begin(),v2.end(),k-v1[i])-v2.begin()));
      |                   ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:3:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:30:22: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   30 |             ans = max(ans,1+i+(upper_bound(v2.begin(),v2.end(),k-v1[i])-v2.begin()));
      |                   ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~