Language: C++

#include <bits/stdc++.h>
#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
#define int long long
typedef long long ll;
using namespace std;
const int MOD = 1000000007;
const int INF = 1010000000;
const double EPS = 1e-10;
const pair<int,int> fd[] = {make_pair(1,0),make_pair(-1,0),make_pair(0,1),make_pair(0,-1)}; 

vector<int> init(int size){
  vector<int> par(size,-1);
  return par;
}

int root(int x, vector<int>& par){
  if(par[x] < 0){
    return x;
  }else{
    return par[x] = root(par[x],par);
  }
}

bool same(int x, int y, vector<int>& par){
  return root(x, par) == root(y, par);
}

void unite(int x, int y, vector<int>& par){
  x = root(x, par), y = root(y, par);
  if(same(x,y, par))return;
  par[x] += par[y];
  par[y] = x;
}

int size(int x, vector<int>& par){
  return -par[root(x, par)];
}

int pow(int x, int n){
  if(n == 0)return 1;
  if(n % 2 == 0)return pow(x * x % MOD, n/2);
  else return x * pow(x, n-1) % MOD;
}


signed main(){
  int n,k;cin>>n>>k;int ans = 0;
  vector<int> v(50);rep(i,n)cin>>v[i];
  rep(i,k+2){
    repd(j,i+1,k+2){
      int sum = 0;priority_queue<int, vector<int>, greater<int>> q;//greater?
      if(k+1-j > i + j-i-1)continue;
      rep(left, i){
        sum += v[left];q.push(v[left]);
      }
      rep(right, j-i-1){
        sum += v[n-right-1];q.push(n-right-1);
      }
      rep(ind, k+1-j){
        sum -= q.top();q.pop();
      }
      if(sum == 16)cout << i << " " << j << endl;
      ans = max(ans, sum);
    }
  }
  cout << max(ans,0) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:67:14: error: no matching function for call to 'max(long long int&, int)'
   67 |   cout << max(ans,0) << endl;
      |           ~~~^~~~~~~
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:67:14: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   67 |   cout << max(ans,0) << endl;
      |           ~~~^~~~~~~
/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:67:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   67 |   cout << max(ans,0) << endl;
      |           ~~~^~~~~~~