Language: C++

#include <bits//stdc++.h>
using namespace std;
typedef long long ll;
int main() {
	ll ans=9999999999999999,h,w;
	cin>>h>>w;
	if(h%3==0||w%3==0){
		ans=0;
	}
	if(w%3==1){
		ll a=(w-1)/3;
		if(a>0&&w-a>0)
			ans=min(ans,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0)))))));
		a=(w+2)/3;
		if(a>0&&w-a>0)
			ans=min(ans,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0))))));
	}
	if(w%3==2){
		ll a=(w-2)/3;
		if(a>0&&w-a>0)
			ans=min(ans,max(0,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0))))))));
		a=(w+1)/3;
		if(a>0&&w-a>0)
			ans=min(ans,max(0,max(0,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0)))))))));
	}
	if(h%3==1){
		ll a=(h-1)/3;
		if(a>0&&h-a>0)
			ans=min(ans,max(0,max(0,max(0,max(0,max(0,abs(max(w*a,(h-a)*(ll)ceil(w/2.0))-min(w*a,(h-a)*(ll)floor((w/2.0))))));
		a=(h+2)/3;
		if(a>0&&h-a>0)
			ans=min(ans,max(0,abs(max(w*a,(h-a)*(ll)ceil(w/2.0))-min(w*a,(h-a)*(ll)floor((w/2.0))))));
	}
	if(h%3==2){
		ll a=(h-2)/3;
		if(a>0&&h-a>0)
			ans=min(ans,max(0,max(0,abs(max(w*a,(h-a)*(ll)ceil(w/2.0))-min(w*a,(h-a)*(ll)floor((w/2.0))))));
		a=(h+1)/3;
		if(a>0&&h-a>0)
			ans=min(ans,max(0,abs(max(w*a,(h-a)*(ll)ceil(w/2.0))-min(w*a,(h-a)*(ll)floor((w/2.0))))));
	}
	cout<<ans<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:46: error: no matching function for call to 'max(int, long long int)'
   13 |                         ans=min(ans,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0)))))));
      |                                           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:13:46: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   13 |                         ans=min(ans,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0)))))));
      |                                           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:13:46: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   13 |                         ans=min(ans,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0)))))));
      |                                           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:16:40: error: no matching function for call to 'max(int, long long int)'
   16 |                         ans=min(ans,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0))))));
      |                                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:16:40: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   16 |                         ans=min(ans,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0))))));
      |                                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:16:40: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   16 |                         ans=min(ans,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0))))));
      |                                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:21:52: error: no matching function for call to 'max(int, long long int)'
   21 |                         ans=min(ans,max(0,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0))))))));
      |                                                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:21:52: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   21 |                         ans=min(ans,max(0,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0))))))));
      |                                                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:21:52: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   21 |                         ans=min(ans,max(0,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0))))))));
      |                                                 ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:24:58: error: no matching function for call to 'max(int, long long int)'
   24 |                         ans=min(ans,max(0,max(0,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0)))))))));
      |                                                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:24:58: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   24 |                         ans=min(ans,max(0,max(0,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0)))))))));
      |                                                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:24:58: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   24 |                         ans=min(ans,max(0,max(0,max(0,max(0,abs(max(h*a,(w-a)*(ll)ceil(h/2.0))-min(h*a,(w-a)*(ll)floor((h/2.0)))))))));
      |                                                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:29:64: error: no matching function for call to 'max(int, long long int)'
   29 |                         ans=min(ans,max(0,max(0,max(0,max(0,max(0,abs(max(w*a,(h-a)*(ll)ceil(w/2.0))-min(w*a,(h-a)*(ll)floor((w/2.0))))));
      |                                                             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:29:64: note:   deduced conflicting types for parameter 'const _Tp' ('