Language: C++

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <utility>
#include <cmath>
#include <string>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <deque>


using namespace std;

using ll = long long;
#define rep(i, n) for(int i = 0; i < (int)(n); i++)

int main() {
	ll w, h;
	cin >> w >> h;

	if (w % 3 == 0 || h % 3 == 0) {
		cout << 0 << endl;
		return 0;
	}

	if (w < h) {
		swap( h, w);
	}
	ll ans = 200000000000;
	for(int cw = max(w / 3 - 10 ,0); cw <= min(w / 3 + 10, w); cw++) {
		ll a = cw * h;
		ll w0 = w - cw; 

		for (int ch = max(h / 2 - 10, 0) ; ch <= min(h / 2 + 10, h); ch++) {
			ll b = ch * w0;
			ll c = (h - ch) * w0;
			ll cur = max(abs(a - b), abs(b - c));
			cur = max(cur, abs(c - a));
			ans = min(ans, cur);
		}
	}
	cout << ans << endl;

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:33:25: error: no matching function for call to 'max(ll, int)'
   33 |         for(int cw = max(w / 3 - 10 ,0); cw <= min(w / 3 + 10, w); cw++) {
      |                      ~~~^~~~~~~~~~~~~~~
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:33:25: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   33 |         for(int cw = max(w / 3 - 10 ,0); cw <= min(w / 3 + 10, w); cw++) {
      |                      ~~~^~~~~~~~~~~~~~~
/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:3:
/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:33:25: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   33 |         for(int cw = max(w / 3 - 10 ,0); cw <= min(w / 3 + 10, w); cw++) {
      |                      ~~~^~~~~~~~~~~~~~~
a.cc:37:34: error: no matching function for call to 'max(ll, int)'
   37 |                 for (int ch = max(h / 2 - 10, 0) ; ch <= min(h / 2 + 10, h); ch++) {
      |                               ~~~^~~~~~~~~~~~~~~
/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:37:34: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   37 |                 for (int ch = max(h / 2 - 10, 0) ; ch <= min(h / 2 + 10, h); ch++) {
      |                               ~~~^~~~~~~~~~~~~~~
/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:37:34: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   37 |                 for (int ch = max(h / 2 - 10, 0) ; ch <= min(h / 2 + 10, h); ch++) {
      |                               ~~~^~~~~~~~~~~~~~~