#689471 (C++17) No.1646 Avoid Palindrome

• 問題: No.1646 Avoid Palindrome
• ユーザー: kimiyuki
• 提出日時: 2021-08-13 22:54:36
• 言語: C++17 (gcc 12.3.0 + boost 1.83.0)
• 結果: AC
• 実行時間: 1,147 ms / 3,000 ms
• コード長: 4,915 bytes
• コンパイル時間: 2,273 ms
• コンパイル使用メモリ: 202,028 KB
• 実行使用メモリ: 5,248 KB
• 最終ジャッジ日時: 2024-11-08 15:53:01
• 合計ジャッジ時間: 27,941 ms
• ジャッジサーバーID （参考情報）: judge5 / judge1

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	2 ms; 5,248 KB
testcase_01	AC	2 ms; 5,248 KB
testcase_02	AC	2 ms; 5,248 KB
testcase_03	AC	2 ms; 5,248 KB
testcase_04	AC	561 ms; 5,248 KB
testcase_05	AC	558 ms; 5,248 KB
testcase_06	AC	540 ms; 5,248 KB
testcase_07	AC	552 ms; 5,248 KB
testcase_08	AC	561 ms; 5,248 KB
testcase_09	AC	533 ms; 5,248 KB
testcase_10	AC	546 ms; 5,248 KB
testcase_11	AC	531 ms; 5,248 KB
testcase_12	AC	560 ms; 5,248 KB
testcase_13	AC	562 ms; 5,248 KB
testcase_14	AC	1,054 ms; 5,248 KB
testcase_15	AC	1,070 ms; 5,248 KB
testcase_16	AC	1,041 ms; 5,248 KB
testcase_17	AC	1,089 ms; 5,248 KB
testcase_18	AC	1,059 ms; 5,248 KB
testcase_19	AC	1,063 ms; 5,248 KB
testcase_20	AC	1,074 ms; 5,248 KB
testcase_21	AC	1,094 ms; 5,248 KB
testcase_22	AC	1,062 ms; 5,248 KB
testcase_23	AC	1,104 ms; 5,248 KB
testcase_24	AC	1,147 ms; 5,248 KB
testcase_25	AC	1,141 ms; 5,248 KB
testcase_26	AC	1,140 ms; 5,248 KB
testcase_27	AC	1,141 ms; 5,248 KB
testcase_28	AC	1,146 ms; 5,248 KB
testcase_29	AC	221 ms; 5,248 KB
testcase_30	AC	220 ms; 5,248 KB
testcase_31	AC	218 ms; 5,248 KB
testcase_32	AC	221 ms; 5,248 KB
testcase_33	AC	221 ms; 5,248 KB
testcase_34	AC	1,147 ms; 5,248 KB
testcase_35	AC	2 ms; 5,248 KB
testcase_36	AC	2 ms; 5,248 KB
testcase_37	AC	2 ms; 5,248 KB
testcase_38	AC	2 ms; 5,248 KB
testcase_39	AC	2 ms; 5,248 KB
testcase_40	AC	2 ms; 5,248 KB
testcase_41	AC	2 ms; 5,248 KB
testcase_42	AC	2 ms; 5,248 KB
testcase_43	AC	222 ms; 5,248 KB

ソースコード

#line 1 "main.cpp"
#include <bits/stdc++.h>
#line 2 "/home/ubuntu/Library/utils/macros.hpp"
#define REP(i, n) for (int i = 0; (i) < (int)(n); ++ (i))
#define REP3(i, m, n) for (int i = (m); (i) < (int)(n); ++ (i))
#define REP_R(i, n) for (int i = (int)(n) - 1; (i) >= 0; -- (i))
#define REP3R(i, m, n) for (int i = (int)(n) - 1; (i) >= (int)(m); -- (i))
#define ALL(x) std::begin(x), std::end(x)
#line 4 "/home/ubuntu/Library/modulus/modpow.hpp"

inline int32_t modpow(uint_fast64_t x, uint64_t k, int32_t MOD) {
    assert (/* 0 <= x and */ x < (uint_fast64_t)MOD);
    uint_fast64_t y = 1;
    for (; k; k >>= 1) {
        if (k & 1) (y *= x) %= MOD;
        (x *= x) %= MOD;
    }
    assert (/* 0 <= y and */ y < (uint_fast64_t)MOD);
    return y;
}
#line 5 "/home/ubuntu/Library/modulus/modinv.hpp"

inline int32_t modinv_nocheck(int32_t value, int32_t MOD) {
    assert (0 <= value and value < MOD);
    if (value == 0) return -1;
    int64_t a = value, b = MOD;
    int64_t x = 0, y = 1;
    for (int64_t u = 1, v = 0; a; ) {
        int64_t q = b / a;
        x -= q * u; std::swap(x, u);
        y -= q * v; std::swap(y, v);
        b -= q * a; std::swap(b, a);
    }
    if (not (value * x + MOD * y == b and b == 1)) return -1;
    if (x < 0) x += MOD;
    assert (0 <= x and x < MOD);
    return x;
}

inline int32_t modinv(int32_t x, int32_t MOD) {
    int32_t y = modinv_nocheck(x, MOD);
    assert (y != -1);
    return y;
}
#line 6 "/home/ubuntu/Library/modulus/mint.hpp"

/**
 * @brief quotient ring / 剰余環 $\mathbb{Z}/n\mathbb{Z}$
 */
template <int32_t MOD>
struct mint {
    int32_t value;
    mint() : value() {}
    mint(int64_t value_) : value(value_ < 0 ? value_ % MOD + MOD : value_ >= MOD ? value_ % MOD : value_) {}
    mint(int32_t value_, std::nullptr_t) : value(value_) {}
    explicit operator bool() const { return value; }
    inline mint<MOD> operator + (mint<MOD> other) const { return mint<MOD>(*this) += other; }
    inline mint<MOD> operator - (mint<MOD> other) const { return mint<MOD>(*this) -= other; }
    inline mint<MOD> operator * (mint<MOD> other) const { return mint<MOD>(*this) *= other; }
    inline mint<MOD> & operator += (mint<MOD> other) { this->value += other.value; if (this->value >= MOD) this->value -= MOD; return *this; }
    inline mint<MOD> & operator -= (mint<MOD> other) { this->value -= other.value; if (this->value <    0) this->value += MOD; return *this; }
    inline mint<MOD> & operator *= (mint<MOD> other) { this->value = (uint_fast64_t)this->value * other.value % MOD; return *this; }
    inline mint<MOD> operator - () const { return mint<MOD>(this->value ? MOD - this->value : 0, nullptr); }
    inline bool operator == (mint<MOD> other) const { return value == other.value; }
    inline bool operator != (mint<MOD> other) const { return value != other.value; }
    inline mint<MOD> pow(uint64_t k) const { return mint<MOD>(modpow(value, k, MOD), nullptr); }
    inline mint<MOD> inv() const { return mint<MOD>(modinv(value, MOD), nullptr); }
    inline mint<MOD> operator / (mint<MOD> other) const { return *this * other.inv(); }
    inline mint<MOD> & operator /= (mint<MOD> other) { return *this *= other.inv(); }
};
template <int32_t MOD> mint<MOD> operator + (int64_t value, mint<MOD> n) { return mint<MOD>(value) + n; }
template <int32_t MOD> mint<MOD> operator - (int64_t value, mint<MOD> n) { return mint<MOD>(value) - n; }
template <int32_t MOD> mint<MOD> operator * (int64_t value, mint<MOD> n) { return mint<MOD>(value) * n; }
template <int32_t MOD> mint<MOD> operator / (int64_t value, mint<MOD> n) { return mint<MOD>(value) / n; }
template <int32_t MOD> std::istream & operator >> (std::istream & in, mint<MOD> & n) { int64_t value; in >> value; n = value; return in; }
template <int32_t MOD> std::ostream & operator << (std::ostream & out, mint<MOD> n) { return out << n.value; }
#line 4 "main.cpp"
using namespace std;

constexpr int64_t MOD = 998244353;
mint<MOD> solve(int64_t n, std::string s) {
    array<array<mint<MOD>, 27>, 27> cur = {};
    cur[26][26] += 1;
    for (char c : s) {
        array<array<mint<MOD>, 27>, 27> prv = {};
        cur.swap(prv);
        REP (k, 26) {
            if (k == c - 'a' or c == '?') {
                REP (i, 27) {
                    REP (j, 27) {
                        if (i != k and j != k) {
                            cur[j][k] += prv[i][j];
                        }
                    }
                }
            }
        }
    }
    mint<MOD> ans = 0;
    REP (i, 27) {
        REP (j, 27) {
            ans += cur[i][j];
        }
    }
    return ans;
}

// generated by oj-template v4.8.0 (https://github.com/online-judge-tools/template-generator)
int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int64_t N;
    std::string S;
    std::cin >> N >> S;
    auto ans = solve(N, S);
    std::cout << ans << '\n';
    return 0;
}