Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define IOS ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define pb push_back
#define ff first
#define ss second
#define rep(i,a,n) for(int i=a;i<n;i++)
#define M 1000000007
ll power(ll x, ll y, ll p)
{
    int res = 1;
    x = x % p;
    while (y > 0)
    {   if (y & 1)
        res = (res*x) % p;
        y = y>>1;
        x = (x*x) % p;
    }
    return res;
}
int main()
{
	IOS;
	ll n,m;
    cin>>n>>m;
  	ll ans=max(0,(n*(n-1))/2)+max(0,(m*(m-1))/2);
  cout<<ans;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:19: error: no matching function for call to 'max(int, long long int)'
   27 |         ll ans=max(0,(n*(n-1))/2)+max(0,(m*(m-1))/2);
      |                ~~~^~~~~~~~~~~~~~~
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:27:19: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   27 |         ll ans=max(0,(n*(n-1))/2)+max(0,(m*(m-1))/2);
      |                ~~~^~~~~~~~~~~~~~~
/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:27:19: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   27 |         ll ans=max(0,(n*(n-1))/2)+max(0,(m*(m-1))/2);
      |                ~~~^~~~~~~~~~~~~~~
a.cc:27:38: error: no matching function for call to 'max(int, long long int)'
   27 |         ll ans=max(0,(n*(n-1))/2)+max(0,(m*(m-1))/2);
      |                                   ~~~^~~~~~~~~~~~~~~
/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:27:38: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   27 |         ll ans=max(0,(n*(n-1))/2)+max(0,(m*(m-1))/2);
      |                                   ~~~^~~~~~~~~~~~~~~
/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:27:38: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   27 |         ll ans=max(0,(n*(n-1))/2)+max(0,(m*(m-1))/2);
      |                                   ~~~^~~~~~~~~~~~~~~