結果

問題 No.2717 Sum of Subarray of Subsequence
ユーザー dyktr_06dyktr_06
提出日時 2024-04-05 22:13:25
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 26 ms / 2,000 ms
コード長 9,307 bytes
コンパイル時間 1,928 ms
コンパイル使用メモリ 207,796 KB
実行使用メモリ 7,932 KB
最終ジャッジ日時 2024-10-01 02:28:20
合計ジャッジ時間 3,192 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge2
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
6,816 KB
testcase_01 AC 2 ms
6,816 KB
testcase_02 AC 1 ms
6,816 KB
testcase_03 AC 2 ms
6,816 KB
testcase_04 AC 2 ms
6,820 KB
testcase_05 AC 1 ms
6,816 KB
testcase_06 AC 2 ms
6,816 KB
testcase_07 AC 1 ms
6,820 KB
testcase_08 AC 1 ms
6,820 KB
testcase_09 AC 26 ms
7,856 KB
testcase_10 AC 24 ms
7,928 KB
testcase_11 AC 24 ms
7,920 KB
testcase_12 AC 24 ms
7,928 KB
testcase_13 AC 24 ms
7,928 KB
testcase_14 AC 24 ms
7,924 KB
testcase_15 AC 25 ms
7,928 KB
testcase_16 AC 24 ms
7,924 KB
testcase_17 AC 24 ms
7,800 KB
testcase_18 AC 24 ms
7,740 KB
testcase_19 AC 24 ms
7,800 KB
testcase_20 AC 2 ms
6,816 KB
testcase_21 AC 2 ms
6,816 KB
testcase_22 AC 25 ms
7,928 KB
testcase_23 AC 16 ms
7,932 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <bits/stdc++.h>

using namespace std;

#define overload4(_1, _2, _3, _4, name, ...) name
#define rep1(n) for(int i = 0; i < (int)(n); ++i)
#define rep2(i, n) for(int i = 0; i < (int)(n); ++i)
#define rep3(i, a, b) for(int i = (a); i < (int)(b); ++i)
#define rep4(i, a, b, c) for(int i = (a); i < (int)(b); i += (c))
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)

#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; --i)
#define ALL(a) (a).begin(), (a).end()
#define Sort(a) (sort((a).begin(), (a).end()))
#define RSort(a) (sort((a).rbegin(), (a).rend()))
#define UNIQUE(a) (a.erase(unique((a).begin(), (a).end()), (a).end()))

typedef long long int ll;
typedef unsigned long long ul;
typedef long double ld;
typedef vector<int> vi;
typedef vector<long long> vll;
typedef vector<char> vc;
typedef vector<string> vst;
typedef vector<double> vd;
typedef vector<long double> vld;
typedef pair<long long, long long> P;

template<class T> long long sum(const T& a){ return accumulate(a.begin(), a.end(), 0LL); }
template<class T> auto min(const T& a){ return *min_element(a.begin(), a.end()); }
template<class T> auto max(const T& a){ return *max_element(a.begin(), a.end()); }

const long long MINF = 0x7fffffffffff;
const long long INF = 0x1fffffffffffffff;
const long long MOD = 998244353;
const long double EPS = 1e-9;
const long double PI = acos(-1);
 
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

template<typename T1, typename T2> istream &operator>>(istream &is, pair<T1, T2> &p){ is >> p.first >> p.second; return is; }
template<typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &p){ os << "(" << p.first << ", " << p.second << ")"; return os; }
template<typename T> istream &operator>>(istream &is, vector<T> &v){ for(T &in : v) is >> in; return is; }
template<typename T> ostream &operator<<(ostream &os, const vector<T> &v){ for(int i = 0; i < (int) v.size(); ++i){ os << v[i] << (i + 1 != (int) v.size() ? " " : ""); } return os; }
template <typename T, typename S> ostream &operator<<(ostream &os, const map<T, S> &mp){ for(auto &[key, val] : mp){ os << key << ":" << val << " "; } return os; }
template <typename T> ostream &operator<<(ostream &os, const set<T> &st){ auto itr = st.begin(); for(int i = 0; i < (int)st.size(); ++i){ os << *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; }
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &st){ auto itr = st.begin(); for(int i = 0; i < (int)st.size(); ++i){ os << *itr << (i + 1 != (int)st.size() ? " " : ""); itr++; } return os; }
template <typename T> ostream &operator<<(ostream &os, queue<T> q){ while(q.size()){ os << q.front() << " "; q.pop(); } return os; }
template <typename T> ostream &operator<<(ostream &os, deque<T> q){ while(q.size()){ os << q.front() << " "; q.pop_front(); } return os; }
template <typename T> ostream &operator<<(ostream &os, stack<T> st){ while(st.size()){ os << st.top() << " "; st.pop(); } return os; }
template <class T, class Container, class Compare> ostream &operator<<(ostream &os, priority_queue<T, Container, Compare> pq){ while(pq.size()){ os << pq.top() << " "; pq.pop(); } return os; }

template<class T, class U> inline T vin(T& vec, U n) { vec.resize(n); for(int i = 0; i < (int) n; ++i) cin >> vec[i]; return vec; }
template<class T> inline void vout(T vec, string s = "\n"){ for(auto x : vec) cout << x << s; }
template<class... T> void in(T&... a){ (cin >> ... >> a); }
void out(){ cout << '\n'; }
template<class T, class... Ts> void out(const T& a, const Ts&... b){ cout << a; (cout << ... << (cout << ' ', b)); cout << '\n'; }
template<class T, class U> void inGraph(vector<vector<T>>& G, U n, U m, bool directed = false){ G.resize(n); for(int i = 0; i < m; ++i){ int a, b; cin >> a >> b; a--, b--; G[a].push_back(b); if(!directed) G[b].push_back(a); } }

template <long long Modulus>
struct ModInt{
    long long val;
    constexpr ModInt(const long long _val = 0) noexcept : val(_val) {
        normalize();
    }
    void normalize(){
        val = (val % Modulus + Modulus) % Modulus;
    }
    inline ModInt& operator+=(const ModInt& rhs) noexcept {
        if(val += rhs.val, val >= Modulus) val -= Modulus;
        return *this;
    }
    inline ModInt& operator-=(const ModInt& rhs) noexcept {
        if(val -= rhs.val, val < 0) val += Modulus;
        return *this;
    }
    inline ModInt& operator*=(const ModInt& rhs) noexcept {
        val = val * rhs.val % Modulus;
        return *this;
    }
    inline ModInt& operator/=(const ModInt& rhs) noexcept {
        val = val * inv(rhs.val).val % Modulus;
        return *this;
    }
    inline ModInt& operator++() noexcept {
        if(++val >= Modulus) val -= Modulus;
        return *this;
    }
    inline ModInt operator++(int) noexcept {
        ModInt t = val;
        if(++val >= Modulus) val -= Modulus;
        return t;
    }
    inline ModInt& operator--() noexcept {
        if(--val < 0) val += Modulus;
        return *this;
    }
    inline ModInt operator--(int) noexcept {
        ModInt t = val;
        if(--val < 0) val += Modulus;
        return t;
    }
    inline ModInt operator-() const noexcept { return (Modulus - val) % Modulus; }
    inline ModInt inv(void) const { return inv(val); }
    ModInt pow(long long n){
        assert(0 <= n);
        ModInt x = *this, r = 1;
        while(n){
            if(n & 1) r *= x;
            x *= x;
            n >>= 1;
        }
        return r;
    }
    ModInt inv(const long long n) const {
        long long a = n, b = Modulus, u = 1, v = 0;
        while(b){
            long long t = a / b;
            a -= t * b; swap(a, b);
            u -= t * v; swap(u, v);
        }
        u %= Modulus;
        if(u < 0) u += Modulus;
        return u;
    }
    friend inline ModInt operator+(const ModInt& lhs, const ModInt& rhs) noexcept { return ModInt(lhs) += rhs; }
    friend inline ModInt operator-(const ModInt& lhs, const ModInt& rhs) noexcept { return ModInt(lhs) -= rhs; }
    friend inline ModInt operator*(const ModInt& lhs, const ModInt& rhs) noexcept { return ModInt(lhs) *= rhs; }
    friend inline ModInt operator/(const ModInt& lhs, const ModInt& rhs) noexcept { return ModInt(lhs) /= rhs; }
    friend inline bool operator==(const ModInt& lhs, const ModInt& rhs) noexcept { return lhs.val == rhs.val; }
    friend inline bool operator!=(const ModInt& lhs, const ModInt& rhs) noexcept { return lhs.val != rhs.val; }
    friend inline istream& operator>>(istream& is, ModInt& x) noexcept {
        is >> x.val;
        x.normalize();
        return is;
    }
    friend inline ostream& operator<<(ostream& os, const ModInt& x) noexcept { return os << x.val; }
};

namespace modcalc{

    template <typename T>
    T modpow(T x, T n, const T &m){
        T ret = 1 % m;
        x %= m;
        while(n > 0){
            if(n & 1) (ret *= x) %= m;
            (x *= x) %= m;
            n >>= 1;
        }
        return ret;
    }

    template <typename T>
    T modinv(T a, T m){
        T b = m, u = 1, v = 0;
        while(b){
            T t = a / b;
            a -= t * b; swap(a, b);
            u -= t * v; swap(u, v);
        }
        u %= m;
        if (u < 0) u += m;
        return u;
    }

    template <typename T>
    T modarithmeticsum(T a, T d, T n, T m){
        T m2 = m * 2;
        a %= m2, n %= m2, d %= m2;
        T b = (n + m2 - 1) * d % m2;
        return ((n * (a * 2 + b) % m2) / 2) % m;
    }

    template <typename T>
    T modgeometricsum(T a, T r, T n, T m){
        a %= m;
        if(r == 1){
            n %= m;
            return a * n % m;
        }
        return a * (modpow(r, n, m) + m - 1) % m * modinv(r - 1, m) % m;
    }

    template <typename T>
    T modgeometricsum2(T a, T r, T n, T m){
        a %= m;
        if(r == 1){
            n %= m;
            return a * n % m;
        }
        T ret = 0;
        T x = 1 % m;
        T sum = 0;
        for(int i = 0; n > 0; ++i){
            if(n & 1){
                (ret += x * modpow(r, sum, m) % m) %= m;
                sum |= 1LL << i;
            }
            (x += x * modpow(r, 1LL << i, m) % m) %= m;
            n >>= 1;
        }
        return a * ret % m;
    }
}

using mint = ModInt<998244353>;

void input(){
}

void solve(){
    ll n; in(n);
    vector<mint> a; vin(a, n);
    if(n == 1){
        out(a[0]);
        return;
    }
    
    mint c = 2;
    c = c.pow(n - 2);
    c *= n + 1;

    vector<mint> b((n + 1) / 2);
    b[0] = c;
    vector<mint> f((n + 1) / 2);
    rep(i, n / 2){
        ll idxd = ((n - 1) / 2) - i;
        if(n % 2){
            f[i] = idxd * idxd;
        }else{
            f[i] = modcalc::modarithmeticsum(1LL, 1LL, idxd, MOD);
        }
    }
    mint d = 4; d = d.pow((n - 2) / 2);
    rep(i, 1, (n + 1) / 2){
        b[i] = b[i - 1] + (f[i - 1] - f[i]) * d;
    }
    rrep(i, n / 2){
        b.push_back(b[i]);
    }
    mint ans = 0;
    rep(i, n){
        ans += a[i] * b[i];
    }
    out(ans);
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(20);
    
    input();
    solve();
}
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