#990322 (C++14) No.2794 I Love EDPC-T

提出ソース

結果

問題	No.2794 I Love EDPC-T
ユーザー	👑 hos.lyric
提出日時	2024-06-21 23:20:12
言語	C++14 (gcc 12.3.0 + boost 1.83.0)
結果	RE
実行時間	-
コード長	5,752 bytes
コンパイル時間	2,031 ms
コンパイル使用メモリ	126,804 KB
実行使用メモリ	79,304 KB
最終ジャッジ日時	2024-06-21 23:20:25
合計ジャッジ時間	13,026 ms
ジャッジサーバーID （参考情報）	judge1 / judge5

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	9 ms 8,520 KB
testcase_01	AC	9 ms 8,388 KB
testcase_02	AC	9 ms 10,052 KB
testcase_03	AC	8 ms 9,028 KB
testcase_04	AC	9 ms 9,156 KB
testcase_05	AC	9 ms 9,540 KB
testcase_06	AC	19 ms 40,764 KB
testcase_07	AC	23 ms 50,624 KB
testcase_08	AC	26 ms 59,668 KB
testcase_09	AC	10 ms 8,648 KB
testcase_10	AC	9 ms 8,780 KB
testcase_11	AC	9 ms 8,776 KB
testcase_12	AC	9 ms 8,524 KB
testcase_13	RE	-
testcase_14	RE	-
testcase_15	RE	-
testcase_16	RE	-
testcase_17	RE	-
testcase_18	RE	-
testcase_19	RE	-
testcase_20	RE	-
testcase_21	RE	-
testcase_22	RE	-
testcase_23	RE	-
testcase_24	RE	-
testcase_25	RE	-
testcase_26	AC	10 ms 10,372 KB
testcase_27	AC	10 ms 10,180 KB
testcase_28	RE	-
testcase_29	RE	-
testcase_30	RE	-
testcase_31	RE	-
testcase_32	RE	-
testcase_33	RE	-

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ソースコード

raw source code

#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx2")

#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <functional>
#include <iostream>
#include <limits>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

using namespace std;

using Int = long long;

template <class T1, class T2> ostream &operator<<(ostream &os, const pair<T1, T2> &a) { return os << "(" << a.first << ", " << a.second << ")"; };
template <class T> ostream &operator<<(ostream &os, const vector<T> &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; }
template <class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; }
template <class T> bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; }
template <class T> bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; }
#define COLOR(s) ("\x1b[" s "m")

////////////////////////////////////////////////////////////////////////////////
template <unsigned M_> struct ModInt {
  static constexpr unsigned M = M_;
  unsigned x;
  constexpr ModInt() : x(0U) {}
  constexpr ModInt(unsigned x_) : x(x_ % M) {}
  constexpr ModInt(unsigned long long x_) : x(x_ % M) {}
  constexpr ModInt(int x_) : x(((x_ %= static_cast<int>(M)) < 0) ? (x_ + static_cast<int>(M)) : x_) {}
  constexpr ModInt(long long x_) : x(((x_ %= static_cast<long long>(M)) < 0) ? (x_ + static_cast<long long>(M)) : x_) {}
  ModInt &operator+=(const ModInt &a) { x = ((x += a.x) >= M) ? (x - M) : x; return *this; }
  ModInt &operator-=(const ModInt &a) { x = ((x -= a.x) >= M) ? (x + M) : x; return *this; }
  ModInt &operator*=(const ModInt &a) { x = (static_cast<unsigned long long>(x) * a.x) % M; return *this; }
  ModInt &operator/=(const ModInt &a) { return (*this *= a.inv()); }
  ModInt pow(long long e) const {
    if (e < 0) return inv().pow(-e);
    ModInt a = *this, b = 1U; for (; e; e >>= 1) { if (e & 1) b *= a; a *= a; } return b;
  }
  ModInt inv() const {
    unsigned a = M, b = x; int y = 0, z = 1;
    for (; b; ) { const unsigned q = a / b; const unsigned c = a - q * b; a = b; b = c; const int w = y - static_cast<int>(q) * z; y = z; z = w; }
    assert(a == 1U); return ModInt(y);
  }
  ModInt operator+() const { return *this; }
  ModInt operator-() const { ModInt a; a.x = x ? (M - x) : 0U; return a; }
  ModInt operator+(const ModInt &a) const { return (ModInt(*this) += a); }
  ModInt operator-(const ModInt &a) const { return (ModInt(*this) -= a); }
  ModInt operator*(const ModInt &a) const { return (ModInt(*this) *= a); }
  ModInt operator/(const ModInt &a) const { return (ModInt(*this) /= a); }
  template <class T> friend ModInt operator+(T a, const ModInt &b) { return (ModInt(a) += b); }
  template <class T> friend ModInt operator-(T a, const ModInt &b) { return (ModInt(a) -= b); }
  template <class T> friend ModInt operator*(T a, const ModInt &b) { return (ModInt(a) *= b); }
  template <class T> friend ModInt operator/(T a, const ModInt &b) { return (ModInt(a) /= b); }
  explicit operator bool() const { return x; }
  bool operator==(const ModInt &a) const { return (x == a.x); }
  bool operator!=(const ModInt &a) const { return (x != a.x); }
  friend std::ostream &operator<<(std::ostream &os, const ModInt &a) { return os << a.x; }
};
////////////////////////////////////////////////////////////////////////////////

constexpr unsigned MO = 998244353;
using Mint = ModInt<MO>;

constexpr int LIM_INV = 400'010;
Mint inv[LIM_INV], fac[LIM_INV], invFac[LIM_INV];

void prepare() {
  inv[1] = 1;
  for (int i = 2; i < LIM_INV; ++i) {
    inv[i] = -((Mint::M / i) * inv[Mint::M % i]);
  }
  fac[0] = invFac[0] = 1;
  for (int i = 1; i < LIM_INV; ++i) {
    fac[i] = fac[i - 1] * i;
    invFac[i] = invFac[i - 1] * inv[i];
  }
}
Mint binom(Int n, Int k) {
  if (n < 0) {
    if (k >= 0) {
      return ((k & 1) ? -1 : +1) * binom(-n + k - 1, k);
    } else if (n - k >= 0) {
      return (((n - k) & 1) ? -1 : +1) * binom(-k - 1, n - k);
    } else {
      return 0;
    }
  } else {
    if (0 <= k && k <= n) {
      assert(n < LIM_INV);
      return fac[n] * invFac[k] * invFac[n - k];
    } else {
      return 0;
    }
  }
}


Mint cat(int n) {
  return fac[2*n] * invFac[n] * invFac[n+1];
}

int N;
char S[200'010];

/*
  https://arxiv.org/pdf/1401.3011
  Th. 5.1
*/
Mint slow() {
  if (~string(S).find("<<")) return 0;
  if (string(S) == string(N - 1, '>')) return 0;
  static Mint dp[3010][2][3010];
  for (int i = 0; i < N; ++i) {
    for (int u = 0; u < 2; ++u) for (int x = 0; x < N; ++x) {
      dp[i][u][x] = 0;
    }
  }
  dp[0][0][0] = 1;
  for (int i = 0; i < N - 1; ++i) {
    if (S[i] == '<') {
      for (int x = 0; x < N; ++x) {
        dp[i + 1][1][x + 1] += dp[i][0][x];
      }
    } else if (S[i] == '>') {
      // PIE
      for (int x = 0; x < N; ++x) {
        dp[i + 1][0][x] += dp[i][0][x] + dp[i][1][x];
      }
      for (int x = 0; x < N; ++x) {
        dp[i + 1][1][x + 1] -= dp[i][0][x];
      }
    } else {
      assert(false);
    }
  }
  Mint ans = 0;
  for (int x = 0; x < N; ++x) {
    const Mint way = dp[N - 1][0][x] + dp[N - 1][1][x];
    ans += way * cat(N - x);
  }
  return ans;
}

int main() {
  prepare();
  for (; ~scanf("%d", &N); ) {
    scanf("%s", S);
    const Mint ans = slow();
    printf("%u\n", ans.x);
  }
  return 0;
}

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結果

テストケース

ソースコード