Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;
 
int main(){ 
  int n, m;
  ll k;
  cin >> n >> m >> k;
  vector<int> a(n), b(m);
  rep(i,n) cin >> a[i];
  rep(j,m) cin >> b[j];
  vector<ll> ca(n + 1, 0), cb(m + 1, 0);
  for (int i = 0; i < n; i++) ca[i + 1] = ca[i] + a[i];
  for (int i = 0; i < m; i++) cb[i + 1] = cb[i] + b[i];

  int res = 0;

  for (int i = 0; i <= n; i++) {
    ll x = k - ca[i];
    if (x < 0) break;
    auto j = lower_bound(cb.begin(), cb.end(), x) - cb.begin();
    if (cb[j] > x) j = max(j - 1, 0);
    if (cb[j] > x) continue;
    res = max(res, i + j);
  }
  cout << res << endl;
  return 0;
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:26:27: error: no matching function for call to 'max(long int, int)'
   26 |     if (cb[j] > x) j = max(j - 1, 0);
      |                        ~~~^~~~~~~~~~
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:26:27: note:   deduced conflicting types for parameter 'const _Tp' ('long int' and 'int')
   26 |     if (cb[j] > x) j = max(j - 1, 0);
      |                        ~~~^~~~~~~~~~
/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:26:27: note:   mismatched types 'std::initializer_list<_Tp>' and 'long int'
   26 |     if (cb[j] > x) j = max(j - 1, 0);
      |                        ~~~^~~~~~~~~~
a.cc:28:14: error: no matching function for call to 'max(int&, long int)'
   28 |     res = max(res, i + j);
      |           ~~~^~~~~~~~~~~~
/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:28:14: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long int')
   28 |     res = max(res, i + j);
      |           ~~~^~~~~~~~~~~~
/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
/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:28:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   28 |     res = max(res, i + j);
      |           ~~~^~~~~~~~~~~~