Language: C++

#include <bits/stdc++.h>
#include <vector>
#include <algorithm>
#include <cmath>

using namespace std;

int main(){

	long long int a, b, n, ma=-1, x1, x2, y1, y2, z;

	cin>> a >> b >> n;

	x1 = max(0, a - 100000);
	x2 = min(a + 100000, n);
	y1 = max(0, b - 100000);
	y2 = min(b + 100000, n);
	z = max(0, n - 100000);

	if (n <= 1000000) {
		for (long long int i = 0;i <= n;i++) {
			//cout << i << " " << (a*i) / b - a * (i / b) << endl;
			ma = max(ma, (a*i) / b - a * (i / b));
		}
	}

	for (long long int i = x1;i <= x2;i++) {
		//cout << i << " " << (a*i) / b - a * (i / b) << endl;
		ma = max(ma, (a*i) / b - a * (i / b));
	}

	for (long long int i = y1;i <= y2;i++) {
		//cout << i << " " << (a*i) / b - a * (i / b) << endl;
		ma = max(ma, (a*i) / b - a * (i / b));
	}

	for (long long int i = z;i <= n;i++) {
		//cout << i << " " << (a*i) / b - a * (i / b) << endl;
		ma = max(ma, (a*i) / b - a * (i / b));
	}

	cout << ma << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:17: error: no matching function for call to 'max(int, long long int)'
   14 |         x1 = max(0, a - 100000);
      |              ~~~^~~~~~~~~~~~~~~
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:14:17: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   14 |         x1 = max(0, a - 100000);
      |              ~~~^~~~~~~~~~~~~~~
/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:14:17: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   14 |         x1 = max(0, a - 100000);
      |              ~~~^~~~~~~~~~~~~~~
a.cc:16:17: error: no matching function for call to 'max(int, long long int)'
   16 |         y1 = max(0, b - 100000);
      |              ~~~^~~~~~~~~~~~~~~
/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:16:17: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   16 |         y1 = max(0, b - 100000);
      |              ~~~^~~~~~~~~~~~~~~
/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:16:17: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   16 |         y1 = max(0, b - 100000);
      |              ~~~^~~~~~~~~~~~~~~
a.cc:18:16: error: no matching function for call to 'max(int, long long int)'
   18 |         z = max(0, n - 100000);
      |             ~~~^~~~~~~~~~~~~~~
/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:18:16: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   18 |         z = max(0, n - 100000);
      |             ~~~^~~~~~~~~~~~~~~
/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:18:16: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   18 |         z = max(0, n - 100000);
      |             ~~~^~~~~~~~~~~~~~~