Language: C++

#include<iostream>
#include<algorithm>
using namespace std;
long long a[1000005];
long long min=1000000000;
int main(){
	long long n,k;
	long long i;
	cin>>n>>k;
	//long long a[1000005];
	for(i=0;i<n;i++)
	cin>>a[i];
	sort(a,a+n);
	
	for(i=2;i<n;i++){
		if(a[i]-a[i-k+1]<min)
		min=a[i]-a[i-k+1];
	}
	cout<<min<<endl;
	return 0;
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:16:34: error: reference to 'min' is ambiguous
   16 |                 if(a[i]-a[i-k+1]<min)
      |                                  ^~~
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidates are: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:                 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
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:281:5: note:                 '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:5:11: note:                 'long long int min'
    5 | long long min=1000000000;
      |           ^~~
a.cc:17:17: error: reference to 'min' is ambiguous
   17 |                 min=a[i]-a[i-k+1];
      |                 ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidates are: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:                 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:                 '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:5:11: note:                 'long long int min'
    5 | long long min=1000000000;
      |           ^~~
a.cc:19:15: error: reference to 'min' is ambiguous
   19 |         cout<<min<<endl;
      |               ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidates are: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:                 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:                 '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:5:11: note:                 'long long int min'
    5 | long long min=1000000000;
      |           ^~~