#811762 (C++17) No.2111 Sum of Diff

• 問題: No.2111 Sum of Diff
• ユーザー: snow39
• 提出日時: 2022-10-28 21:38:00
• 言語: C++17 (gcc 13.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 27 ms / 2,000 ms
• コード長: 3,259 bytes
• コンパイル時間: 890 ms
• コンパイル使用メモリ: 106,456 KB
• 最終ジャッジ日時: 2025-02-08 14:13:54
• ジャッジサーバーID （参考情報）: judge5 / judge4

ファイルパターン	結果
sample	AC * 2
other	AC * 20

ソースコード

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#include <algorithm>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <tuple>
#include <vector>
#define mkp make_pair
#define mkt make_tuple
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define all(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
const ll MOD = 1e9 + 7;
// const ll MOD = 998244353;
template <class T>
void chmin(T& a, const T& b) {
    if (a > b) a = b;
}
template <class T>
void chmax(T& a, const T& b) {
    if (a < b) a = b;
}
template <long long mod>
class modint {
private:
    using T = long long;
    T a;
public:
    constexpr modint(const long long x = 0) noexcept : a((x % mod + mod) % mod) {}
    constexpr T& value() noexcept {
        return a;
    }
    constexpr const T& value() const noexcept {
        return a;
    }
    constexpr modint operator-() const noexcept {
        return modint(0) -= *this;
    }
    constexpr modint operator+(const modint& rhs) const noexcept {
        return modint(*this) += rhs;
    }
    constexpr modint operator-(const modint& rhs) const noexcept {
        return modint(*this) -= rhs;
    }
    constexpr modint operator*(const modint& rhs) const noexcept {
        return modint(*this) *= rhs;
    }
    constexpr modint operator/(const modint& rhs) const noexcept {
        return modint(*this) /= rhs;
    }
    constexpr modint& operator+=(const modint& rhs) noexcept {
        a += rhs.a;
        if (a >= mod) a -= mod;
        return *this;
    }
    constexpr modint& operator-=(const modint& rhs) noexcept {
        if (a < rhs.a) a += mod;
        a -= rhs.a;
        return *this;
    }
    constexpr modint& operator*=(const modint& rhs) noexcept {
        a = a * rhs.a % mod;
        return *this;
    }
    constexpr modint& operator/=(const modint& rhs) noexcept {
        return *this *= rhs.inv();
    }
    constexpr bool operator==(const modint& rhs) const noexcept {
        return a == rhs.a;
    }
    constexpr bool operator!=(const modint& rhs) const noexcept {
        return not(*this == rhs);
    }
    constexpr modint pow(long long k) const noexcept {
        modint ret(1);
        modint x = k > 0 ? *this : this->inv();
        k = abs(k);
        while (k > 0) {
            if (k & 1) ret *= x;
            x *= x;
            k >>= 1;
        }
        return ret;
    }
    constexpr modint inv() const noexcept {
        return pow(mod - 2);
    }
    friend std::ostream& operator<<(std::ostream& os, const modint& X) noexcept {
        return os << X.a;
    }
    friend std::istream& operator>>(std::istream& is, modint& X) noexcept {
        is >> X.a;
        X.a %= mod;
        if (X.a < 0) X.a += mod;
        return is;
    }
};
using mint = modint<998244353>;
void solve() {
    int N;
    cin >> N;
    vector<mint> A(N);
    rep(i, N) cin >> A[i];
    vector<mint> two(N + 1);
    two[0] = 1;
    rep(i, N) two[i + 1] = two[i] * 2;
    mint ans = 0;
    rep(i, N - 1) {
        ans += A[i] * (two[N - i - 1] - 1);
    }
    for (int i = 1; i < N; i++) {
        ans -= A[i] * (two[i] - 1);
    }
    cout << ans << endl;
}
int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    solve();
    return 0;
}
 
 
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