Language: C++

#include <bits/stdc++.h>
using ll = long long;
using namespace std;
#define rep(i, n) for (int i = 0, i##_len = (int)(n); i < i##_len; i++)
#define reps(i, n) for (int i = 1, i##_len = (int)(n); i <= i##_len; i++)
#define rrep(i, n) for (int i = ((int)(n)-1); i >= 0; i--)
#define rreps(i, n) for (int i = ((int)(n)); i > 0; i--)
#define repi(i, x) \
	for (auto i = (x).begin(), i##_fin = (x).end(); i != i##_fin; i++)
#define all(x) (x).begin(), (x).end()
#define F first
#define S second
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define eb emplace_back
string solve(bool a) { return ((a) ? "Yes" : "No"); }
typedef vector<int> Vi;
typedef vector<Vi> VVi;
typedef pair<int, int> Pi;
typedef vector<Pi> VPi;
typedef vector<long long> V;
typedef vector<V> VV;
typedef pair<long long, long long> P;
typedef vector<P> VP;
template <class T>
inline bool chmax(T& a, T b) {
	if (a < b) {
		a = b;
		return 1;
	}
	return 0;
}
template <class T>
inline bool chmin(T& a, T b) {
	if (a > b) {
		a = b;
		return 1;
	}
	return 0;
}
template <class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
	os << "(" << p.first << "," << p.second << ")";
	return os;
}
template <class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
	os << "{";
	rep(i, v.size()) {
		if (i) os << ",";
		os << v[i];
	}
	os << "}";
	return os;
}
template <class T, class U>
istream& operator>>(istream& is, pair<T, U>& p) {
	is >> p.first >> p.second;
	return is;
}
template <class T>
istream& operator>>(istream& is, vector<T>& v) {
	rep(i, v.size()) { is >> v[i]; }
	return is;
}
const long long INFLL = 1LL << 60;
const int INF         = 1 << 30;
const double PI       = acos(-1);
int main() {
	int n;
	ll ans = 0LL;
	cin >> n;
	Vi l(n);
	cin >> l;
	auto ter = l.begin();
	sort(all(l));
	for (auto i = l.begin(); i != l.end(); i++) {
		for (auto j = i + 1; j != l.end(); j++) {
			//clog << "min " << *i + *j << endl;
			ter = upper_bound(j, l.end(), *i + *j - 1);
			ter--;
			ans += max(0, distance(j, ter));
		//	clog << *i << " " << *j << " " << *(ter) << " ;" << ans << endl;
		}
	}
	cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:83:35: error: no matching function for call to 'max(int, std::__iterator_traits<__gnu_cxx::__normal_iterator<int*, std::vector<int> >, void>::difference_type)'
   83 |                         ans += max(0, distance(j, ter));
      |                                ~~~^~~~~~~~~~~~~~~~~~~~~
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:83:35: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'std::__iterator_traits<__gnu_cxx::__normal_iterator<int*, std::vector<int> >, void>::difference_type' {aka 'long int'})
   83 |                         ans += max(0, distance(j, ter));
      |                                ~~~^~~~~~~~~~~~~~~~~~~~~
/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:83:35: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   83 |                         ans += max(0, distance(j, ter));
      |                                ~~~^~~~~~~~~~~~~~~~~~~~~