Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <queue>
#include <stack>
#include <set> 
#include <map>
#include <bitset>
#include <cctype>
#include <cmath>
#include <cstring>
#include <iomanip>
#define REP(i,n) for(int i=0; i<(n); ++i)
#define FOR(i,a,b) for(int i=(a); i<(b); ++i)
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const int INF = 100100100;
const int MOD = (int)1e9 + 7;
const double EPS = 1e-9;

int main () {
    
    ll n,k; cin >>n>>k;
    vector<ll> v(n);
    for (int i = 0; i < n; i++) {
        ll a; cin >> a;
        v[i] = a;
    }

    vector<ll> lres(k+1, 0);
    for (int l = 1; l <= k; l++) {  //ちょうどl回操作する
        ll res_l = 0;
        for (int i = ceil(((double)l)/2); i <= l; i++) {  //「取る」操作をl回のうちi回する
            priority_queue<ll, vector<ll>, greater<ll> > p;  //手元の宝石を昇順でもつ
            ll sum = 0;
            for (int j = 0; j < i; j++) { //左から「取る」操作
                ll val = v[j];
                p.push(val);
                sum += val;
            }
            for (int j = 0; j < l-i; j++) { //「戻す」操作
                ll val = p.top(); p.pop();
                sum -= val; 
            }
            res_l = max(res_l, max(sum, 0));
        }
        lres[l] = res_l;
    }

    vector<ll> rres(k+1, 0);
    for (int l = 1; l <= k; l++) {  //ちょうどl回操作する
        ll res_l = 0;
        for (int i = ceil(((double)l)/2); i <= l; i++) {  //「取る」操作をl回のうちi回する
            priority_queue<ll, vector<ll>, greater<ll> > p;  //手元の宝石を昇順でもつ
            ll sum = 0;
            for (int j = 0; j < i; j++) { //右から「取る」操作
                ll val = v[n-1-j];
                p.push(val);
                sum += val;
            }
            for (int j = 0; j < l-i; j++) { //「戻す」操作
                ll val = p.top(); p.pop();
                sum -= val; 
            }
            res_l = max(res_l, max(sum, 0));
        }
        rres[l] = res_l;
    }
    
    ll res = -1;
    for (int l = 0; l <= k; l++) {
        for (int h = 0; h <= k; h++) {
            if (l+h <= k) {
                res = max(res, lres[l] + rres[h]);
            } 
        }
    }

    cout << res << endl;
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:47:35: error: no matching function for call to 'max(ll&, int)'
   47 |             res_l = max(res_l, max(sum, 0));
      |                                ~~~^~~~~~~~
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:47:35: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   47 |             res_l = max(res_l, max(sum, 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,
                 from a.cc:2:
/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:47:35: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   47 |             res_l = max(res_l, max(sum, 0));
      |                                ~~~^~~~~~~~
a.cc:67:35: error: no matching function for call to 'max(ll&, int)'
   67 |             res_l = max(res_l, max(sum, 0));
      |                                ~~~^~~~~~~~
/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:67:35: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   67 |             res_l = max(res_l, max(sum, 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
/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:67:35: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   67 |             res_l = max(res_l, max(sum, 0));
      |                                ~~~^~~~~~~~