Language: C++

/* ****GT_18**** */

#include<bits/stdc++.h>
#define ll          long long
#define pb          push_back
#define	endl		'\n'
#define pii         pair<ll int,ll int>
#define vi          vector<ll int>
#define all(a)      (a).begin(),(a).end()
#define F           first
#define S           second
#define sz(x)       (ll int)x.size()
#define hell        1000000007
#define rep(i,a,b)	for(ll int i=a;i<b;i++)
#define lbnd        lower_bound
#define ubnd        upper_bound
#define bs          binary_search
#define mp          make_pair
using namespace std;

#define N  100005

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int TESTS=1;
//	cin>>TESTS;
	while(TESTS--)
	{
		int n,i,ans=INT_MIN;
		ll sum=0;
		priority_queue<int> q;
		priority_queue<int,vector<int>,greater<int>>p;

		cin>>n;
		ll arr[3*n+1],g[3*n],s[3*n];
		rep(i,0,3*n)
		cin>>arr[i];
		for(i=0;i<3*n;i++)
		{
			sum+=arr[i];
			p.push(arr[i]);
			if(i>=n)
			{
				sum-=p.top();
				p.pop();
			}
			g[i]=sum;

		}sum=0;
		for(i=3*n-1;i>=0;i--)
		{
			s[i]=sum;
			sum+=arr[i];
			q.push(arr[i]);

			if(i<2*n)
			{
				sum-=q.top();
				q.pop();
			}
			
		}
		for(i=n-1;i<2*n;i++)
		{
			ans=max(ans,g[i]-s[i]);

		}
		cout<<ans;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:68:32: error: no matching function for call to 'max(int&, long long int)'
   68 |                         ans=max(ans,g[i]-s[i]);
      |                             ~~~^~~~~~~~~~~~~~~
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:3:
/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:68:32: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   68 |                         ans=max(ans,g[i]-s[i]);
      |                             ~~~^~~~~~~~~~~~~~~
/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:68:32: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   68 |                         ans=max(ans,g[i]-s[i]);
      |                             ~~~^~~~~~~~~~~~~~~