結果

問題 No.1239 Multiplication -2
ユーザー hitonanodehitonanode
提出日時 2020-10-03 14:44:57
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 17 ms / 2,000 ms
コード長 5,364 bytes
コンパイル時間 2,003 ms
コンパイル使用メモリ 202,284 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-07-18 04:26:51
合計ジャッジ時間 2,981 ms
ジャッジサーバーID
(参考情報)
judge2 / judge3
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
6,940 KB
testcase_02 AC 2 ms
6,940 KB
testcase_03 AC 1 ms
6,944 KB
testcase_04 AC 2 ms
6,940 KB
testcase_05 AC 1 ms
6,940 KB
testcase_06 AC 2 ms
6,940 KB
testcase_07 AC 1 ms
6,940 KB
testcase_08 AC 1 ms
6,944 KB
testcase_09 AC 1 ms
6,944 KB
testcase_10 AC 1 ms
6,940 KB
testcase_11 AC 2 ms
6,940 KB
testcase_12 AC 1 ms
6,944 KB
testcase_13 AC 1 ms
6,944 KB
testcase_14 AC 1 ms
6,944 KB
testcase_15 AC 6 ms
6,944 KB
testcase_16 AC 9 ms
6,940 KB
testcase_17 AC 13 ms
6,944 KB
testcase_18 AC 14 ms
6,944 KB
testcase_19 AC 15 ms
6,944 KB
testcase_20 AC 17 ms
6,940 KB
testcase_21 AC 15 ms
6,940 KB
testcase_22 AC 14 ms
6,940 KB
testcase_23 AC 11 ms
6,940 KB
testcase_24 AC 10 ms
6,944 KB
testcase_25 AC 8 ms
6,944 KB
testcase_26 AC 10 ms
6,944 KB
testcase_27 AC 5 ms
6,940 KB
testcase_28 AC 14 ms
6,944 KB
testcase_29 AC 15 ms
6,944 KB
testcase_30 AC 8 ms
6,940 KB
testcase_31 AC 11 ms
6,940 KB
testcase_32 AC 16 ms
6,940 KB
testcase_33 AC 12 ms
6,944 KB
testcase_34 AC 11 ms
6,944 KB
testcase_35 AC 6 ms
6,944 KB
testcase_36 AC 6 ms
6,940 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;
using lint = long long;
using pint = pair<int, int>;
using plint = pair<lint, lint>;
struct fast_ios { fast_ios(){ cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;
#define ALL(x) (x).begin(), (x).end()
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
template <typename T> void ndarray(vector<T> &vec, int len) { vec.resize(len); }
template <typename T, typename... Args> void ndarray(vector<T> &vec, int len, Args... args) { vec.resize(len); for (auto &v : vec) ndarray(v, args...); }
template <typename V, typename T> void ndfill(V &x, const T &val) { x = val; }
template <typename V, typename T> void ndfill(vector<V> &vec, const T &val) { for (auto &v : vec) ndfill(v, val); }
template <typename T> bool chmax(T &m, const T q) { if (m < q) {m = q; return true;} else return false; }
template <typename T> bool chmin(T &m, const T q) { if (m > q) {m = q; return true;} else return false; }
template <typename T1, typename T2> pair<T1, T2> operator+(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first + r.first, l.second + r.second); }
template <typename T1, typename T2> pair<T1, T2> operator-(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first - r.first, l.second - r.second); }
template <typename T> vector<T> srtunq(vector<T> vec) { sort(vec.begin(), vec.end()), vec.erase(unique(vec.begin(), vec.end()), vec.end()); return vec; }
template <typename T> istream &operator>>(istream &is, vector<T> &vec) { for (auto &v : vec) is >> v; return is; }
template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec) { os << '['; for (auto v : vec) os << v << ','; os << ']'; return os; }
#if __cplusplus >= 201703L
template <typename... T> istream &operator>>(istream &is, tuple<T...> &tpl) { std::apply([&is](auto &&... args) { ((is >> args), ...);}, tpl); return is; }
template <typename... T> ostream &operator<<(ostream &os, const tuple<T...> &tpl) { std::apply([&os](auto &&... args) { ((os << args << ','), ...);}, tpl); return os; }
#endif
template <typename T> ostream &operator<<(ostream &os, const deque<T> &vec) { os << "deq["; for (auto v : vec) os << v << ','; os << ']'; return os; }
template <typename T> ostream &operator<<(ostream &os, const set<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_set<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; }
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_multiset<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; }
template <typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &pa) { os << '(' << pa.first << ',' << pa.second << ')'; return os; }
template <typename TK, typename TV> ostream &operator<<(ostream &os, const map<TK, TV> &mp) { os << '{'; for (auto v : mp) os << v.first << "=>" << v.second << ','; os << '}'; return os; }
template <typename TK, typename TV> ostream &operator<<(ostream &os, const unordered_map<TK, TV> &mp) { os << '{'; for (auto v : mp) os << v.first << "=>" << v.second << ','; os << '}'; return os; }
#ifdef HITONANODE_LOCAL
#define dbg(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ") " << __FILE__ << endl
#else
#define dbg(x)
#endif

template <int mod>
struct ModInt
{
    using lint = long long;
    int val;
    constexpr ModInt() : val(0) {}
    constexpr ModInt &_setval(lint v) { val = (v >= mod ? v - mod : v); return *this; }
    constexpr ModInt(lint v) { _setval(v % mod + mod); }
    constexpr ModInt operator+(const ModInt &x) const { return ModInt()._setval((lint)val + x.val); }
    constexpr ModInt operator*(const ModInt &x) const { return ModInt()._setval((lint)val * x.val % mod); }
    constexpr ModInt &operator+=(const ModInt &x) { return *this = *this + x; }
    constexpr ModInt &operator*=(const ModInt &x) { return *this = *this * x; }
    friend constexpr ModInt operator+(lint a, const ModInt &x) { return ModInt()._setval(a % mod + x.val); }
    friend constexpr ModInt operator*(lint a, const ModInt &x) { return ModInt()._setval(a % mod * x.val % mod); }
};
constexpr int MOD = 998244353;
using mint = ModInt<MOD>;

int main()
{
    int N;
    cin >> N;

    mint arr[5];
    REP(d, 5) arr[d] = 0;
    auto dp = arr + 2;

    mint ret = 0;

    mint inv2 = (MOD + 1) / 2;
    bool finv = false;
    REP(i, N)
    {
        int a;
        cin >> a;
        FOR(d, -2, 3) dp[d] *= inv2;
        if (a < 0)
        {
            swap(dp[-2], dp[2]);
            swap(dp[-1], dp[1]);
        }
        if (a == 0)
        {
            dp[-2] = dp[-1] = dp[0] = dp[1] = dp[2] = 0;
        }
        if (abs(a) == 2)
        {
            dp[-2] = dp[-1], dp[2] = dp[1], dp[-1] = dp[1] = 0;
        }
        dp[finv ? -a : a] += (i == 0 ? mint(1) : inv2);
        ret += (i == N - 1 ? mint(1) : inv2) * dp[-2];
    }
    cout << ret.val << '\n';
}
0