Language: C++

#pragma comment(linker, "/STACK:1000000000")
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <string>
#include <cstring>
#include <queue>
#include <deque>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <bitset>
#include <memory>
#include <cassert>
#include <cstdlib>
#include <cmath>
#include <ctime> 
#include <stack>

#define mp make_pair
#define pb push_back

typedef long long ll;
typedef long double ld;

using namespace std;

const int MAXN = 200001;

int a[MAXN];

int main()
{
	ios_base::sync_with_stdio(0);
	int n, c, k;
	cin >> n >> c >> k;
	for (int i = 0; i < n; i++) cin >> a[i];
	sort(a, a + n);
	int p = 0;
	int cur = 0;
	while (p < n)
	{
		cur++;
		p = min(p + c, upper_bound(a, a + n, a[p] + k) - a);
	}
	cout << cur << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:47:24: error: no matching function for call to 'min(int, long int)'
   47 |                 p = min(p + c, upper_bound(a, a + n, a[p] + k) - a);
      |                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:3:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:47:24: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long int')
   47 |                 p = min(p + c, upper_bound(a, a + n, a[p] + k) - a);
      |                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: '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:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:6:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: '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:5696:5: note:   template argument deduction/substitution failed:
a.cc:47:24: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   47 |                 p = min(p + c, upper_bound(a, a + n, a[p] + k) - a);
      |                     ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~