Language: C++

#include"bits/stdc++.h"
#include<cassert>
#define fr first
#define sc second
using namespace std;
#define int long long
#define rep(i,n) for(int i=0;i<n;i++)
const long long mod = 998244353;
const long long inf = 1ll << 62;
typedef pair<int, int> P;
typedef pair<int, P> PP;
int t[100006], d[100006];
P p[100006];
int ut[100006];
signed main() {
	int n, k; cin >> n >> k;
	rep(i, n)cin >> t[i] >> d[i];
	rep(i, n)p[i] = P(d[i], t[i]);
	sort(p, p + n);
	reverse(p, p + n);
	int ans = 0, now = 0;
	set<int>S;
	priority_queue<P>Q;
	priority_queue<P, vector<P>, greater<P>>Q1;
	rep(i, k) {
		now += p[i].first;
		S.insert(p[i].second);
		ut[p[i].second]++;
		if (ut[p[i].second] > 1)Q1.push(p[i]);
	}
	ans=now+ S.size()*S.size();
	for (int i = k; i < n; i++)Q.push(p[i]);
	while (Q.size()) {
		P x = Q.top();
		Q.pop();
		if (ut[x.second])continue;
		if (Q1.size()) {
			P y = Q1.top(); Q1.pop();
			S.insert(x.second);
			ut[x.second]++;
			now -= y.first;
			now += x.first;
		}
		ans = max(ans, now + S.size()*S.size());
	}
	cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:44:26: error: no matching function for call to 'max(long long int&, long long unsigned int)'
   44 |                 ans = max(ans, now + S.size()*S.size());
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:44:26: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'long long unsigned int')
   44 |                 ans = max(ans, now + S.size()*S.size());
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:44:26: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   44 |                 ans = max(ans, now + S.size()*S.size());
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~