Language: C++

#include<iostream>
#include<algorithm>
using namespace std;
long long map[101][101];
int main(){
	int n,a;
	cin>>n;
	for(int i=0;i<=n;i++)map[i][0]=0;
	for(int j=0;j<=n;j++)map[0][j]=0;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			cin>>a;
			map[i][j]=map[i-1][j]+map[i][j-1]-map[i-1][j-1]+a;
		}
	}
	int ans=0;
	for(int i=0;i<n;i++){
		for(int is=i+1;is<=n;is++){
			for(int j=0;j<n;j++){
				for(int js=j+1;js<=n;js++){
					ans=max(ans,map[is][js]-map[is][j]-map[i][js]+map[i][j]);
				}
			}
		}
	}
	cout<<ans<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:48: error: no matching function for call to 'max(int&, long long int)'
   21 |                                         ans=max(ans,map[is][js]-map[is][j]-map[i][js]+map[i][j]);
      |                                             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:21:48: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   21 |                                         ans=max(ans,map[is][js]-map[is][j]-map[i][js]+map[i][j]);
      |                                             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:21:48: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   21 |                                         ans=max(ans,map[is][js]-map[is][j]-map[i][js]+map[i][j]);
      |                                             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~