Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define all(a) (a).begin(),(a).end()
#define rep(i,n) repi(i,0,n)
#define repi(i,a,b) for(ll i=(a);i<(b);i++)
#define rrep(i,n) for(ll (i)=(n)-1;(i)>=0;i--)
#define SHOW(x) cout << #x << ": " << x << endl;
const ll INF=1e18;
int main(){
    ll n,m;
    cin>>n>>m;
    if(n*m<=2){
        cout<<n*m%2<<endl;
    }
    else if(n==1||m==1){
        cout<<max(0,n-2)*m+max(0,m-2)*n<<endl;
    }
    else cout<<(n-2)*(m-2)<<endl;
}




Compiler output:
a.cc: In function 'int main()':
a.cc:17:18: error: no matching function for call to 'max(int, ll)'
   17 |         cout<<max(0,n-2)*m+max(0,m-2)*n<<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:17:18: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'll' {aka 'long long int'})
   17 |         cout<<max(0,n-2)*m+max(0,m-2)*n<<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:17:18: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   17 |         cout<<max(0,n-2)*m+max(0,m-2)*n<<endl;
      |               ~~~^~~~~~~
a.cc:17:31: error: no matching function for call to 'max(int, ll)'
   17 |         cout<<max(0,n-2)*m+max(0,m-2)*n<<endl;
      |                            ~~~^~~~~~~
/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:17:31: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'll' {aka 'long long int'})
   17 |         cout<<max(0,n-2)*m+max(0,m-2)*n<<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
/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:17:31: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   17 |         cout<<max(0,n-2)*m+max(0,m-2)*n<<endl;
      |                            ~~~^~~~~~~