結果
| 問題 | No.2561 みんな大好きmod 998 | 
| コンテスト | |
| ユーザー |  NATTO | 
| 提出日時 | 2023-12-02 14:57:39 | 
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 317 ms / 4,000 ms | 
| コード長 | 2,882 bytes | 
| コンパイル時間 | 5,034 ms | 
| コンパイル使用メモリ | 311,776 KB | 
| 実行使用メモリ | 5,376 KB | 
| 最終ジャッジ日時 | 2024-09-26 17:45:42 | 
| 合計ジャッジ時間 | 9,890 ms | 
| ジャッジサーバーID (参考情報) | judge3 / judge4 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 3 | 
| other | AC * 44 | 
ソースコード
#pragma region header
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
// clang-format off
struct Fast {Fast() {std::cin.tie(0); ios::sync_with_stdio(false);}} fast;
inline void IN(void)
{
    return;
}
template <typename First, typename... Rest>
void IN(First &first, Rest &...rest)
{
    cin >> first;
    IN(rest...);
    return;
}
template <typename T>
istream &operator>>(istream &is, pair<T, T> &p)
{
    is >> p.first >> p.second;
    return is;
}
template <typename T>
istream &operator>>(istream &is, vector<T> &v)
{
    for (auto &x : v)
        is >> x;
    return is;
}
template <typename T>
ostream &operator<<(ostream &os, vector<T> &v)
{
    for (auto &x : v)
        os << x << " ";
    os << endl;
    return os;
}
// templetes
//alias
 
using ull = unsigned long long;
using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vs = vector<string>;
using pll = pair<ll, ll>;
 
//define short
#define vec vector
#define all(obs) (obs).begin(), (obs).end()
#define YESNO(cond) (cond) ? cout << "YES" << endl : cout << "NO" << endl;
#define YesNo(cond) (cond) ? cout << "Yes" << endl : cout << "No" << endl;
#define yesno(cond) (cond) ? cout << "yes" << endl : cout << "no" << endl;
#define sortv(obs) sort(all(obs))
#define rsortv(obs) reverse(sort(all(obs)))
#define bitu(n,i) (((n)>>(i))&1)
#define dig10(n) to_string(n).size()
#define bcnt(n) __builtin_popcount(n)
#define bcntll(n) __builtin_popcountll(n)
#define F first
#define S second
#define pb push_back
#define pq priority_queue
//define loop
#define rep(i, a,b) for(ll i = a; i < (b); i++)
#define rrep(i, a,b) for(ll i = a; i >= (b); i--)
//define INF
const ll INF = 1e18;
template <typename T1,typename T2>
inline void chmin(T1 &a,T2 b){
    if(a>b) a = b;
}
template <typename T1,typename T2>
inline void chmax(T1 &a,T2 b){
    if(a<b) a = b;
}
#pragma endregion header
// clang-format on
ll inv(ll a, ll m){
    ll b = m, u = 1, v = 0;
    while(b){
        ll t = a/b;
        a -= t*b; swap(a,b);
        u -= t*v; swap(u,v);
    }
    u %= m;
    if(u<0) u += m;
    return u;
}
int main(){
    ll n,k;
    cin >> n >> k;
    vll a(n);
    cin >> a;
    ll ans=0;
    auto dfs=[&](auto dfs, ll i,vll v){
        if(i>=n-1&&v.size()<k){
            return;
        }
        if(v.size()==k){
            ll s1=0,s2=0;
            rep(j,0,k){
                s1+=a[v[j]]%998;
                s1%=998;
                s2+=a[v[j]]%998244353;
                s2%=998244353;
            }
            if(s1>=s2) ans++;
            ans%=998;
            return;
        }
        rep(j,i+1,n){
            v.pb(j);
            dfs(dfs,j,v);
            v.pop_back();
        }
    };
    dfs(dfs,-1,{});
    cout << ans << endl;
}
            
            
            
        