Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define rep( i, n, m ) for(int i = ( n ); i < ( m ); i++)
#define rep_d( i, n, m ) for(int i = ( n ) - 1; i >= ( m ); i--)
#define sort_asc( X ) sort(( X ).begin(), ( X ).end())
#define sort_desc( X ) sort(( X ).begin(), ( X ).end(), greater <>())
#define all( X ) ( X ).begin(), ( X ).end()

template <class T> bool chmax( T& a, T b );
template <class T> bool chmin( T& a, T b );
int* eratosthenes( int N );
bool bit_search( int pattern, int N );
template <class T> void cumulative_sum( T array, size_t N );

const ll INF = 1LL << 60;
const int k_mod = 1e9 + 7;

template <typename T, typename K> struct P {
	T a; K b;
};
typedef struct {
	vector <int> to;
	bool is_visited = false;
} node;
typedef struct {
	int to;
	int cost;
	P <int, int> change;
} edge;

int main(){
	ll N, M, K;
	cin >> N >> M >> K;
	vector <ll> A( N ), B( M );
	cin >> A[ 0 ];
	rep( i, 1, N ){
		cin >> A[ i ];
		A[ i ] += A[ i - 1 ];
	}
	cin >> B[ 0 ];
	rep( i, 1, M ){
		cin >> B[ i ];
		B[ i ] += B[ i - 1 ];
	}
	int maximum = 0;
	rep( i, 0, N ){
		if (K - A[ i ] < 1)
			break;
		maximum = max( maximum, i + 1 + distance( B.begin(), lower_bound( all( B ), K - A[ i ] + 1 )));
	}
	cout << maximum << endl;
}

int* eratosthenes( int N ){
	int* prime_array = new int[ N + 1 ];
	int lim = N;
	prime_array[ 0 ] = 0;
	prime_array[ 1 ] = 0;
	rep( i, 2, N + 1 ){
		prime_array[ i ] = 1;
	}
	rep( i, 2, lim ){
		if (prime_array[ i ] == 0)
			continue;
		lim = N / i;
		for(int j = i * 2; j < N + 1; j += i){
			prime_array[ j ] = 0;
		}
	}
	return prime_array;
}
template <class T> void cumulative_sum( T array, size_t N ) {
	rep( i, 1, N + 1 ){
		array[ i ] += array[ i - 1 ];
	}
}
template <class T> bool chmax( T& a, T b ) {
	if (a < b){
		a = b; return true;
	}
	return false;
}
template <class T> bool chmin( T& a, T b ) {
	if (a > b){
		a = b; return true;
	}
	return false;
}
bool bit_search( int pattern, int N ){
	int cnt = 0;
	rep( bit, 0, N ){
		if (pattern & ( 1 << bit )){
			cnt++;
		}
	}
	return true;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:50:30: error: no matching function for call to 'max(int&, std::__iterator_traits<__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >, void>::difference_type)'
   50 |                 maximum = max( maximum, i + 1 + distance( B.begin(), lower_bound( all( B ), K - A[ i ] + 1 )));
      |                           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:50:30: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::__iterator_traits<__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >, void>::difference_type' {aka 'long int'})
   50 |                 maximum = max( maximum, i + 1 + distance( B.begin(), lower_bound( all( B ), K - A[ i ] + 1 )));
      |                           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:50:30: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   50 |                 maximum = max( maximum, i + 1 + distance( B.begin(), lower_bound( all( B ), K - A[ i ] + 1 )));
      |                           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~