Language: C++

#include <bits/stdc++.h>
using namespace std;

long init_sum(unordered_map<int, int> &d_max, int k, priority_queue<int> &ds, stack<int> &remove_candidate) {
    long res = 0;
    priority_queue<int> type;
    for (auto x : d_max) {
        type.push(x.second);
    }
    int i = k;
    while (!type.empty() && k > 0) {
        k--;
        int top = type.top();
        res += top; type.pop();
        remove_candidate.push(top);
    }
    while (k > 0) {
        k--;
        res += ds.top(); ds.pop();
    }
    return res;
}

int main() {
    int n, k;
    cin >> n >> k;
    priority_queue<int> ds;
    unordered_map<int, int> d_max;
    for (int i = 0; i < n; i++) {
        int t, d;
        cin >> t >> d;
        if (d_max.find(t) == d_max.end()) {
            d_max[t] = d;
        } else {
            if (d_max[t] < d) {
                ds.push(d_max[t]);
                d_max[t] = d;
            } else {
                ds.push(d);
            }
        }
    }

    long types = min((long) d_max.size(), k);
    stack<int> remove_candidate;
    long d_sum = init_sum(d_max, k, ds, remove_candidate);
    long ans = d_sum + types * types;

    while (types > 0) {
        if (ds.empty() || ds.top() <= remove_candidate.top())
            break;

        types--;
        d_sum += (long) ds.top() - remove_candidate.top();
        ds.pop();
        remove_candidate.pop();
        ans = max(ans, d_sum + types * types);
    }

    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:44:21: error: no matching function for call to 'min(long int, int&)'
   44 |     long types = min((long) d_max.size(), k);
      |                  ~~~^~~~~~~~~~~~~~~~~~~~~~~~
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:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:44:21: note:   deduced conflicting types for parameter 'const _Tp' ('long int' and 'int')
   44 |     long types = min((long) d_max.size(), k);
      |                  ~~~^~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: 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:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:44:21: note:   mismatched types 'std::initializer_list<_Tp>' and 'long int'
   44 |     long types = min((long) d_max.size(), k);
      |                  ~~~^~~~~~~~~~~~~~~~~~~~~~~~