Language: C++

#include <iostream>
#include <array>
#include <algorithm>
#include <cstdint>
constexpr std::size_t n_max = 3000;
int main() {
  using std::uint32_t;
  uint32_t n, k;
  std::cin >> n >> k;
  std::array<uint32_t, n_max> h{}, dp{};
  std::generate_n(h.begin(), n, [](){
    uint32_t n;
    std::cin >> n;
    return n;
  });
  std::fill_n(dp.begin() + 1, n, 999999999);
  dp[0] = 0;
  auto abs_diff = [](uint32_t n1, uint32_t n2){ return n1 < n2 ? n2 - n1 : n1 - n2; };
  for (int i = 1; i < n; ++i) {
    for (int j = std::max(i - k, 0); j < i; ++j) {
      dp[i] = std::min(dp[i], dp[j] + abs_diff(h[i], h[j]));
    }
  }
  std::cout << dp[n - 1] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:26: error: no matching function for call to 'max(uint32_t, int)'
   20 |     for (int j = std::max(i - k, 0); j < i; ++j) {
      |                  ~~~~~~~~^~~~~~~~~~
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:20:26: note:   deduced conflicting types for parameter 'const _Tp' ('unsigned int' and 'int')
   20 |     for (int j = std::max(i - k, 0); j < i; ++j) {
      |                  ~~~~~~~~^~~~~~~~~~
/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:20:26: note:   mismatched types 'std::initializer_list<_Tp>' and 'unsigned int'
   20 |     for (int j = std::max(i - k, 0); j < i; ++j) {
      |                  ~~~~~~~~^~~~~~~~~~
a.cc:24:29: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   24 |   std::cout << dp[n - 1] << endl;
      |                             ^~~~
      |                             std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~