Language: C++

#include <bits/stdc++.h>
//#define int long long int
using namespace std;
typedef long long int ll;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	ll N, M, K;
	cin >> N >> M >> K;
	vector<ll> A;
	vector<ll> B;
	for (int i = 0; i < N; i++)
	{
		ll temp;
		cin >> temp;
		if (i > 0)
			A.push_back(temp + A[i - 1]);
		else
			A.push_back(temp);
	}

	for (int i = 0; i < M; i++)
	{
		ll temp;
		cin >> temp;
		if (i > 0)
			B.push_back(temp + B[i - 1]);
		else
		{
			B.push_back(temp);
		}
	}
	ll ans = 0;
	auto it = upper_bound(B.begin(), B.end(), K);
	// cout <<temp<<" "<<*it<<endl;
	// if(*it <= temp)
	ans = max(ans, (it - B.begin()));
	for (ll i = 0; i < N; i++)
	{
		ll temp = K - A[i];
		// cout << A[i]<<endl;
		if (temp > 0)
		{
			auto it = upper_bound(B.begin(), B.end(), temp);
			// cout <<temp<<" "<<*it<<endl;
			// if(*it <= temp)
			ans = max(ans, i + 1L + (it - B.begin()));
			// else
			// {
			// 	ans = max(ans,i+1);
			// }
		}
	}
	cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:39:18: error: no matching function for call to 'max(ll&, __gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >::difference_type)'
   39 |         ans = max(ans, (it - B.begin()));
      |               ~~~^~~~~~~~~~~~~~~~~~~~~~~
In file included 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_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:39:18: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and '__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >::difference_type' {aka 'long int'})
   39 |         ans = max(ans, (it - B.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:
/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:39:18: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   39 |         ans = max(ans, (it - B.begin()));
      |               ~~~^~~~~~~~~~~~~~~~~~~~~~~