Language: C++

#include<iostream>
#include<cstdio>
#include<fstream>
#include<algorithm>
#include<cmath>
#include<deque>
#include<vector>
#include<queue>
#include<string>
#include<cstring>
#include<map>
#include<stack>
#include<set>
#define mem(a,b) memset(a,b,sizeof(a))
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
const int maxn =1200100;
typedef pair<ll,ll>p1;
typedef pair<pair<ll,ll>,ll>p2;
map<pair<pair<ll,ll>,ll>,ll>m1;
map<pair<ll,ll>,ll>m2;
const int MOD = 1e9;
const int N=351;
const int inf = 0x3f3f3f3f;
typedef pair<char, int> PAIR;
map<string,int>mm;
int a[maxn];
int dp[maxn];
int main()
{
    int n,k;
    scanf("%d %d",&n,&k);
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&a[i]);
    }
    dp[1] = 0;
    for(int i=2;i<=n;i++)
    {
        dp[i] = inf;
    }
    for(int i=2;i<=n;i++)
    {
        for(int j=max(1ll,j-k);j<=i-1;j++)
        {
            dp[i] = min(dp[j]+abs(a[j]-a[i]),dp[i]);
        }
    }
    cout<<dp[n]<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:45:22: error: no matching function for call to 'max(long long int, int)'
   45 |         for(int j=max(1ll,j-k);j<=i-1;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:45:22: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   45 |         for(int j=max(1ll,j-k);j<=i-1;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:4:
/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:45:22: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   45 |         for(int j=max(1ll,j-k);j<=i-1;j++)
      |                   ~~~^~~~~~~~~