Language: C++

#include<iostream>
using namespace std;

int n, max, min, a;

int main() {
	cin >> n;
	max = -9999999;
	min = 99999999;
	for (int i = 0; i < n; i++) {
		cin >> a;
		if (a > max)max = a;
		if (a < min)min = a;
	}
	cout << max - min << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: reference to 'max' is ambiguous
    8 |         max = -9999999;
      |         ^~~
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:303:5: note: candidates are: '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:257:5: note:                 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
a.cc:4:8: note:                 'int max'
    4 | int n, max, min, a;
      |        ^~~
a.cc:9:9: error: reference to 'min' is ambiguous
    9 |         min = 99999999;
      |         ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidates are: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:                 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
a.cc:4:13: note:                 'int min'
    4 | int n, max, min, a;
      |             ^~~
a.cc:12:25: error: reference to 'max' is ambiguous
   12 |                 if (a > max)max = a;
      |                         ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidates are: '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:257:5: note:                 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
a.cc:4:8: note:                 'int max'
    4 | int n, max, min, a;
      |        ^~~
a.cc:12:29: error: reference to 'max' is ambiguous
   12 |                 if (a > max)max = a;
      |                             ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidates are: '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:257:5: note:                 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
a.cc:4:8: note:                 'int max'
    4 | int n, max, min, a;
      |        ^~~
a.cc:13:25: error: reference to 'min' is ambiguous
   13 |                 if (a < min)min = a;
      |                         ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidates are: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:                 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
a.cc:4:13: note:                 'int min'
    4 | int n, max, min, a;
      |             ^~~
a.cc:13:29: error: reference to 'min' is ambiguous
   13 |                 if (a < min)min = a;
      |                             ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidates are: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:                 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
a.cc:4:13: note:                 'int min'
    4 | int n, max, min, a;
      |             ^~~
a.cc:15:17: error: reference to 'max' is ambiguous
   15 |         cout << max - min << endl;
      |                 ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidates are: '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:257:5: note:                 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
a.cc:4:8: note:                 'int max'
    4 | int n, max, min, a;
      |        ^~~
a.cc:15:23: error: reference to 'min' is ambiguous
   15 |         cout << max - min << endl;
      |                       ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidates are: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:                 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
a.cc:4:13: note:                 'int min'
    4 | int n, max, min, a;
      |             ^~~