結果
| 問題 | No.1740 Alone 'a' |
| ユーザー |
 🍮かんプリン
|
| 提出日時 | 2022-11-03 08:41:22 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 183 ms / 2,000 ms |
| コード長 | 7,291 bytes |
| コンパイル時間 | 2,106 ms |
| コンパイル使用メモリ | 188,000 KB |
| 実行使用メモリ | 6,944 KB |
| 最終ジャッジ日時 | 2024-07-17 19:18:42 |
| 合計ジャッジ時間 | 6,415 ms |
|
ジャッジサーバーID （参考情報） |
judge1 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 38 |
ソースコード
/*** @FileName a.cpp* @Author kanpurin* @Created 2022.11.03 08:41:16**/#include "bits/stdc++.h"using namespace std;typedef long long ll;template< int MOD >struct mint {public:unsigned int x;mint() : x(0) {}mint(long long v) {long long w = (long long)(v % (long long)(MOD));if (w < 0) w += MOD;x = (unsigned int)(w);}mint(std::string &s) {unsigned int z = 0;for (int i = 0; i < s.size(); i++) {z *= 10;z += s[i] - '0';z %= MOD;}x = z;}mint operator+() const { return *this; }mint operator-() const { return mint() - *this; }mint& operator+=(const mint &a) {if ((x += a.x) >= MOD) x -= MOD;return *this;}mint& operator-=(const mint &a) {if ((x -= a.x) >= MOD) x += MOD;return *this;}mint& operator*=(const mint &a) {unsigned long long z = x;z *= a.x;x = (unsigned int)(z % MOD);return *this;}mint& operator/=(const mint &a) {return *this = *this * a.inv(); }friend mint operator+(const mint& lhs, const mint& rhs) {return mint(lhs) += rhs;}friend mint operator-(const mint& lhs, const mint& rhs) {return mint(lhs) -= rhs;}friend mint operator*(const mint& lhs, const mint& rhs) {return mint(lhs) *= rhs;}friend mint operator/(const mint& lhs, const mint& rhs) {return mint(lhs) /= rhs;}friend bool operator==(const mint& lhs, const mint& rhs) {return lhs.x == rhs.x;}friend bool operator!=(const mint& lhs, const mint& rhs) {return lhs.x != rhs.x;}friend std::ostream& operator<<(std::ostream &os, const mint &n) {return os << n.x;}friend std::istream &operator>>(std::istream &is, mint &n) {unsigned int x;is >> x;n = mint(x);return is;}mint inv() const {assert(x);return pow(MOD-2);}mint pow(long long n) const {assert(0 <= n);mint p = *this, r = 1;while (n) {if (n & 1) r *= p;p *= p;n >>= 1;}return r;}mint sqrt() const {if (this->x < 2) return *this;if (this->pow((MOD-1)>>1).x != 1) return mint(0);mint b = 1, one = 1;while (b.pow((MOD-1) >> 1) == 1) b += one;long long m = MOD-1, e = 0;while (m % 2 == 0) m >>= 1, e += 1;mint x = this->pow((m - 1) >> 1);mint y = (*this) * x * x;x *= (*this);mint z = b.pow(m);while (y.x != 1) {int j = 0;mint t = y;while (t != one) j += 1, t *= t;z = z.pow(1LL << (e-j-1));x *= z; z *= z; y *= z; e = j;}return x;}};constexpr int MOD = 998244353;struct Monoid {using T = mint<MOD>;T val;bool undef = true;Monoid() { *this = zero(); }Monoid(T val, bool undef = true) : val(val),undef(undef) {}static Monoid zero() { return Monoid(0); }static Monoid e() { return Monoid(1,false); }Monoid& operator+=(const Monoid &a) {if (this->undef) *this = a;else if (!a.undef) this->val += a.val;return *this;}Monoid& operator*=(int c) {return *this;}friend Monoid operator+(const Monoid& a, const Monoid& b) {return Monoid(a) += b;}friend Monoid operator*(const Monoid& a, int c) {return Monoid(a) *= c;}friend std::ostream& operator<<(std::ostream &os, const Monoid &x) {return os << x.val;}};struct Automaton {vector<vector<int>> delta;vector<bool> is_accept, is_reject;int qsize;int init;int alphabet_size = 10;inline int next(int state, int c) const { return delta[state][c]; }inline bool accept(int state) const { return is_accept[state]; }inline bool reject(int state) const { return is_reject[state]; }inline int size() const {return qsize; }};template<typename Automaton>Monoid digitDP(const string &s, const Automaton &dfa, bool eq = 1) {vector<vector<Monoid>> dp(2,vector<Monoid>(dfa.size(),Monoid::zero()));dp[1][dfa.init] = Monoid::e();for (int i = 0; i < s.size(); i++) {vector<vector<Monoid>> dp2(2,vector<Monoid>(dfa.size(),Monoid::zero()));for (int tight = 0; tight <= 1; tight++) {for (int state = 0; state < dfa.size(); state++) {if (dfa.reject(state) || dp[tight][state].undef) continue;int lim = (tight ? s[i] - '0' : dfa.alphabet_size - 1);for (int c = 0; c <= lim; c++) {int tight_ = tight && c == lim;int state_ = dfa.next(state,c);if (dfa.reject(state_)) continue;dp2[tight_][state_] += dp[tight][state]*c;}}}dp = move(dp2);}Monoid ans = Monoid::zero();for (int tight = 0; tight <= eq; tight++)for (int state = 0; state < dfa.size(); state++)if (dfa.accept(state)) ans += dp[tight][state];return ans;}struct CountNumberAutomaton : public Automaton {private:std::vector<bool> flg;int num;bool eq;void initializer() {assert(flg.size() == alphabet_size);qsize = num+3;init = num+2;set_delta();set_is_accept();set_is_reject();}void set_delta() {delta.resize(qsize,std::vector<int>(alphabet_size));for (int state = 0; state < qsize; state++) {for (int c = 0; c < alphabet_size; c++) {if (state == init && c == 0) delta[state][c] = init;else if (state == init) delta[state][c] = flg[c]?1:0;else if (state == num+1) delta[state][c] = state;else delta[state][c] = flg[c]?state+1:state;}}}void set_is_accept() {is_accept.resize(qsize,false);if (eq) is_accept[num] = true;else {for (int state = 0; state <= num; state++) {is_accept[state] = true;}is_accept[num+2] = true;}}void set_is_reject() {is_reject.resize(qsize,false);is_reject[num+1] = true;}public:CountNumberAutomaton(std::vector<bool> flg, int num, bool eq = false, int alpha_size = 10) : flg(flg),num(num),eq(eq) {alphabet_size = alpha_size;initializer();}};int main() {int n;cin >> n;string s;cin >> s;for (int i = 0; i < n; i++) {s[i] = s[i]-'a'+'0';}s = "1"+s;string t(n+1,'0');t[0] = '1';vector<bool> flg(26,false); flg[0] = true;auto M = CountNumberAutomaton(flg,1,true,26);cout << digitDP(s,M,false).val-digitDP(t,M,false).val << endl;return 0;}