Language: C++

#include<iostream>
#include<queue>
#include<algorithm>
#include<vector>
#include<set>
#include<stack>
using namespace std;

typedef long long ll;
typedef pair<ll,int> P;

int main(){
    int N,K; cin >> N >> K;
    ll t[N],d[N];
    
    vector<P> res(N);

    for(int i=0;i<N;i++){
        cin >> t[i] >> d[i];
        res[i]=make_pair(d[i],t[i]);
    }

    sort(res.begin(),res.end(),greater<P>());

    set<int> set;
    stack<int> st;
    ll ans=0;
    for(int i=0;i<K;i++){
        if(set.count(res[i].second)){
            st.push(res[i].first); //ダブりを追加
        }
        set.insert(res[i].second);
        ans+=res[i].first;
    }
    ll sum=ans;
    ans=sum+set.size()*set.size();
    for(int i=K;i<N;i++){
        if(st.empty()) break; //種類を増やせなくなったらループを抜ける
        if(set.count(res[i].second)) continue; //種類が増えない場合は最大値が更新されない
        set.insert(res[i].second);
        sum-=st.top(); st.pop();
        sum+=res[i].first;
        ans=max(ans,sum+set.size()*set.size());
    }

    cout << ans << endl;
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:43:16: error: no matching function for call to 'max(ll&, long long unsigned int)'
   43 |         ans=max(ans,sum+set.size()*set.size());
      |             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:43:16: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'long long unsigned int')
   43 |         ans=max(ans,sum+set.size()*set.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,
                 from a.cc:3:
/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:43:16: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   43 |         ans=max(ans,sum+set.size()*set.size());
      |             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~