Language: C++

#include <iostream>
#include <vector>
#include <fstream>

// directions


#define bit(x, i) (x&(1<<i))  //select the bit of position i of x
#define lowbit(x) ((x)&((x)^((x)-1))) //get the lowest bit of x
#define hBit(msb, n) asm("bsrl %1,%0" : "=r"(msb) : "r"(n)) //get the highest bit of x, maybe the fastest
#define max(a, b) (a<b?b:a)
#define min(a, b) (a>b?b:a)
#define abs(x) (x<0?(-x):x) // big bug here if "-x" is not surrounded by "()"
#define IN(i, l, r) (l<i&&i<r) //the next for are for checking bound
#define LINR(i, l, r) (l<=i&&i<=r)
#define LIN(i, l, r) (l<=i&&i<r)
#define INR(i, l, r) (l<i&&i<=r)

#define wez2(n, m) int (n),(m); scanf("%d %d",&(n),&(m))
#define wez3(n, m, k) int (n),(m),(k); scanf("%d %d %d",&(n),&(m),&(k))
#define TESTS wez(testow)while(testow--) //for multilple cases problems
#define whileZ int T; getI(T); while(T--) // the same as above
#define getS(x) scanf("%s", x) //get a char* string
#define clr(a, x) memset(a,x,sizeof(a)) //set elements of array to some value
#define char2Int(c) (c-'0')
#define lastEle(vec) vec[vec.size()-1]
#define SZ(x) ((int)((x).size()))
#define REMAX(a, b) (a)=max((a),(b)) // set a to the maximum of a and b
#define REMIN(a, b) (a)=min((a),(b));
#define FOREACH(i, t) for (typeof(t.begin()) i=t.begin(); i!=t.end(); i++) // traverse an STL data structure
#define ALL(c) (c).begin(),(c).end() //handy for function like "sort()"
#define PRESENT(c, x) ((c).find(x) != (c).end())
#define CPRESENT(c, x) (find(ALL(c),x) != (c).end())
#define ll long long //data types used often, but you don't want to type them time by time
#define ull unsigned long long
#define us unsigned short
#define IOS ios_base::sync_with_stdio(0); //to synchronize the input of cin and scanf
#define INF 1001001001
#define PI 3.1415926535897932384626
//for map, pair
#define mp make_pair
#define fi first
#define se second

#define DBG(vari) cerr<<#vari<<" = "<<(vari)<<endl;
#define printA(a, L, R) FE(i,L,R) cout << a[i] << (i==R?'\n':' ')
#define printV(a) printA(a,0,a.size()-1)

#define ui unsigned int
//for vectors
#define pb push_back
    typedef int elem_t;
    typedef vector<int> vi;
    typedef vector<long> vl;
    typedef vector<vl> vvl;
    typedef vector<vi> vvi;
    typedef pair<int, int> ii;
#define F(i, L, R) for (int i = L; i < R; i++) //next four are for "for loops"
#define FE(i, L, R) for (int i = L; i <= R; i++)
#define FF(i, L, R) for (int i = L; i > R; i--)
#define FFE(i, L, R) for (int i = L; i >= R; i--)
#define getI(a) scanf("%d", &a) //next three are handy ways to get ints, it's also force you to use '&' sign
#define getII(a, b) scanf("%d%d", &a, &b)
#define getIII(a, b, c) scanf("%d%d%d", &a, &b, &c)
#define wez(n) int (n); scanf("%d",&(n)) //handy if the input is right after the definition of a variable/


#define maxN 200


//class Frog1 {
//public:
int h[10000];

int solve() {

    using namespace std;
    int N, K;
//        freopen("/Users/fbrubacher/Downloads/atcoder.in", "r", stdin);
    cin >> N >> K;
    vi dp(N);
    F(i, 0, N) cin >> h[i];
    F(i, 0, N) {
        for (int j = i + 1; j <= i + K; j++) {
            if (j < N)
                dp[j] = min(dp[j], dp[i] + abs(h[i] - h[j]));
        }
    }

    printf("%d\n", dp[N - 1]);
}

//};

Compiler output:
a.cc:53:13: error: 'vector' does not name a type
   53 |     typedef vector<int> vi;
      |             ^~~~~~
a.cc:54:13: error: 'vector' does not name a type
   54 |     typedef vector<long> vl;
      |             ^~~~~~
a.cc:55:13: error: 'vector' does not name a type
   55 |     typedef vector<vl> vvl;
      |             ^~~~~~
a.cc:56:13: error: 'vector' does not name a type
   56 |     typedef vector<vi> vvi;
      |             ^~~~~~
a.cc:57:13: error: 'pair' does not name a type
   57 |     typedef pair<int, int> ii;
      |             ^~~~
a.cc: In function 'int solve()':
a.cc:81:5: error: 'vi' was not declared in this scope; did you mean 'ui'?
   81 |     vi dp(N);
      |     ^~
      |     ui
a.cc:86:17: error: 'dp' was not declared in this scope; did you mean 'mp'?
   86 |                 dp[j] = min(dp[j], dp[i] + abs(h[i] - h[j]));
      |                 ^~
      |                 mp
a.cc:90:20: error: 'dp' was not declared in this scope; did you mean 'mp'?
   90 |     printf("%d\n", dp[N - 1]);
      |                    ^~
      |                    mp
a.cc:91:1: warning: no return statement in function returning non-void [-Wreturn-type]
   91 | }
      | ^