Language: C++

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <queue>
#include <stack>
#include <vector>
#include <string>
#include <map>
#include <cmath>
using namespace std;

#define INF 0x3f3f3f3f
#define eps 1e-8

typedef long long ll;
const int MAXN = 200010;

int sumA[MAXN], sumB[MAXN];
int dp[MAXN];

int main() {
	int n, m, k;
	scanf("%d%d%d", &n, &m, &k);
	for (int i=1; i<=n; i++) {
		scanf("%d", &sumA[i]);
		sumA[i] += sumA[i-1];
	}
	for (int i=1; i<=m; i++){
		scanf("%d", &sumB[i]);
		sumB[i] += sumB[i-1];
	}
	
	ll ans = 0;
	for (int i=1; i<=n; i++) {
		if (k >= sumA[i])
			ans = ans=max(ans,upper_bound(sumB+1,sumB+1+m,k-sumA[i])-sumB-1+i);
		else
			break;
	}
	printf("%lld\n", ans);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:37:38: error: no matching function for call to 'max(ll&, long int)'
   37 |                         ans = ans=max(ans,upper_bound(sumB+1,sumB+1+m,k-sumA[i])-sumB-1+i);
      |                                   ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:37:38: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'long int')
   37 |                         ans = ans=max(ans,upper_bound(sumB+1,sumB+1+m,k-sumA[i])-sumB-1+i);
      |                                   ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:4:
/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:37:38: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   37 |                         ans = ans=max(ans,upper_bound(sumB+1,sumB+1+m,k-sumA[i])-sumB-1+i);
      |                                   ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~