dp的的轉移,可以看成列舉所有情況,再加上列舉所有轉移方式,得到轉移結果.
而記憶化搜尋,其實就是一種深搜式的帶剪枝dp,我傻逼一樣的深搜,其實只是暴力列舉,蠢的一匹.
掛上來把

/* Farewell. */
#include <iostream>
#include <vector>
#include <cstdio>
#include <stack>
#include <cstring>
#include <algorithm>
#include <queue>
#include <map>
 

#include <string>
#include <cmath>
#include <bitset>
#include <iomanip>
#include <set>
using namespace std;
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define gcd __gcd
#define debug(x) std::cerr << #x << " = " << (x) << std::endl
 

typedef long long  LL;
typedef unsigned long long ULL;
typedef pair<int,int > pii;
typedef pair<LL,LL> pll;
typedef pair<double,double > pdd;
typedef pair<double,int > pdi;
const int INF = 0x7fffffff;
const LL INFF = 0x7f7f7f7fffffffff;
const int MAXM = 5e3+17;


const int MOD = 998244353
 
;
const int MAXN = 3e3+17;
LL ans = 0;
int n,x,k,id = 0;
void dfs(int now,int be,int lft)
{
    ans = (ans+1)%MOD;
    if(be+1<k&&lft>=now)
    {
        dfs(now,be+1,lft-now);
    }
    //debug(lft);debug(ans);
    for (int i = now+1; i <= lft ; ++i)
    {
        dfs(i, 1, lft-i);
        // vec.pop_back();
    }

}
int main(int argc, char const *argv[])
{
     #ifdef GoodbyeMonkeyKing
    freopen("Input.txt","r",stdin);freopen("Output.txt","w",stdout);
    #endif
    cin>>n>>x>>k;
    for (int i = x; i <= n ; ++i)
    {
        //vector<int > vec;
        //vec.push_back(i);
        dfs(i,1,n-i);
    }
    cout<<ans<<endl;
    return 0;
}