結果

問題 No.1331 Moving Penguin
ユーザー KoDKoD
提出日時 2021-01-08 21:37:50
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 325 ms / 1,500 ms
コード長 6,881 bytes
コンパイル時間 986 ms
コンパイル使用メモリ 82,496 KB
実行使用メモリ 121,728 KB
最終ジャッジ日時 2024-11-07 14:36:02
合計ジャッジ時間 14,127 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge5
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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 22 ms
11,776 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 325 ms
121,564 KB
testcase_05 AC 274 ms
121,552 KB
testcase_06 AC 273 ms
121,600 KB
testcase_07 AC 276 ms
121,664 KB
testcase_08 AC 270 ms
121,640 KB
testcase_09 AC 275 ms
121,608 KB
testcase_10 AC 272 ms
121,600 KB
testcase_11 AC 270 ms
121,728 KB
testcase_12 AC 276 ms
121,568 KB
testcase_13 AC 275 ms
121,616 KB
testcase_14 AC 277 ms
121,600 KB
testcase_15 AC 272 ms
121,600 KB
testcase_16 AC 282 ms
121,548 KB
testcase_17 AC 273 ms
121,600 KB
testcase_18 AC 272 ms
121,664 KB
testcase_19 AC 275 ms
121,536 KB
testcase_20 AC 273 ms
121,728 KB
testcase_21 AC 274 ms
121,600 KB
testcase_22 AC 270 ms
121,552 KB
testcase_23 AC 274 ms
121,600 KB
testcase_24 AC 273 ms
121,548 KB
testcase_25 AC 274 ms
121,608 KB
testcase_26 AC 287 ms
121,600 KB
testcase_27 AC 290 ms
121,640 KB
testcase_28 AC 284 ms
121,584 KB
testcase_29 AC 287 ms
121,548 KB
testcase_30 AC 91 ms
42,596 KB
testcase_31 AC 151 ms
70,016 KB
testcase_32 AC 79 ms
37,984 KB
testcase_33 AC 118 ms
55,440 KB
testcase_34 AC 178 ms
82,560 KB
testcase_35 AC 290 ms
121,600 KB
testcase_36 AC 295 ms
121,576 KB
testcase_37 AC 291 ms
121,628 KB
testcase_38 AC 98 ms
44,668 KB
testcase_39 AC 280 ms
117,760 KB
testcase_40 AC 136 ms
62,080 KB
testcase_41 AC 285 ms
121,600 KB
testcase_42 AC 303 ms
121,456 KB
testcase_43 AC 306 ms
121,632 KB
testcase_44 AC 303 ms
121,592 KB
testcase_45 AC 304 ms
121,600 KB
testcase_46 AC 306 ms
121,600 KB
testcase_47 AC 309 ms
121,600 KB
testcase_48 AC 275 ms
121,600 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 # 

#line 1 "main.cpp"

/**
 * @title Template
 */

#include <iostream>
#include <algorithm>
#include <utility>
#include <numeric>
#include <vector>
#include <array>
#include <cassert>

#line 2 "/Users/kodamankod/Desktop/cpp_programming/Library/other/range.cpp"

#line 4 "/Users/kodamankod/Desktop/cpp_programming/Library/other/range.cpp"

class range {
  struct iter {
    std::size_t itr;
    constexpr iter(std::size_t pos) noexcept: itr(pos) { }
    constexpr void operator ++ () noexcept { ++itr; }
    constexpr bool operator != (iter other) const noexcept { return itr != other.itr; }
    constexpr std::size_t operator * () const noexcept { return itr; }
  };

  struct reviter {
    std::size_t itr;
    constexpr reviter(std::size_t pos) noexcept: itr(pos) { }
    constexpr void operator ++ () noexcept { --itr; }
    constexpr bool operator != (reviter other) const noexcept { return itr != other.itr; }
    constexpr std::size_t operator * () const noexcept { return itr; }
  };

  const iter first, last;

public:
  constexpr range(std::size_t first, std::size_t last) noexcept: first(first), last(std::max(first, last)) { }
  constexpr iter begin() const noexcept { return first; }
  constexpr iter end() const noexcept { return last; }
  constexpr reviter rbegin() const noexcept { return reviter(*last - 1); } 
  constexpr reviter rend() const noexcept { return reviter(*first - 1); } 
};

/**
 * @title Range
 */
#line 2 "/Users/kodamankod/Desktop/cpp_programming/Library/algebraic/modular.cpp"

#line 2 "/Users/kodamankod/Desktop/cpp_programming/Library/algebraic/mod_inv.cpp"

#line 4 "/Users/kodamankod/Desktop/cpp_programming/Library/algebraic/mod_inv.cpp"
#include <cstdint>

constexpr std::pair<int64_t, int64_t> mod_inv(int64_t a, int64_t b) {
  if ((a %= b) == 0) return { b, 0 };
  int64_t s = b, t = (a < 0 ? a + b : a);
  int64_t m0 = 0, m1 = 1, tmp = 0;
  while (t > 0) {
    const auto u = s / t;
    s -= t * u; m0 -= m1 * u;
    tmp = s; s = t; t = tmp; tmp = m0; m0 = m1; m1 = tmp;
  }
  return { s, (m0 < 0 ? m0 + b / s : m0) };
}

/**
 * @title Extended GCD
 */
#line 4 "/Users/kodamankod/Desktop/cpp_programming/Library/algebraic/modular.cpp"

#line 8 "/Users/kodamankod/Desktop/cpp_programming/Library/algebraic/modular.cpp"
#include <type_traits>

template <class Modulus>
class modular {
public:
  using value_type = uint32_t;
  using cover_type = uint64_t;
 
  static constexpr uint32_t mod() { return Modulus::mod(); }
  template <class T>
  static constexpr value_type normalize(T value_) noexcept {
    if (value_ < 0) {
      value_ = -value_;
      value_ %= mod();
      if (value_ == 0) return 0;
      return mod() - value_;
    }
    return value_ % mod();
  }

private:
  value_type value;

  template <bool IsPrime, std::enable_if_t<IsPrime>* = nullptr>
  constexpr modular inverse_helper() const noexcept { return power(*this, mod() - 2); }
  template <bool IsPrime, std::enable_if_t<!IsPrime>* = nullptr>
  constexpr modular inverse_helper() const noexcept {
    const auto tmp = mod_inv(value, mod());
    assert(tmp.first == 1);
    return modular(tmp.second);
  }

public:
  constexpr modular() noexcept : value(0) { }
  template <class T>
  explicit constexpr modular(T value_) noexcept : value(normalize(value_)) { }
  template <class T>
  explicit constexpr operator T() const noexcept { return static_cast<T>(value); }
 
  constexpr value_type get() const noexcept { return value; }
  constexpr value_type &extract() noexcept { return value; }
  constexpr modular operator - () const noexcept { return modular(mod() - value); }
  constexpr modular operator ~ () const noexcept { return inverse(*this); }
 
  constexpr modular operator + (const modular &rhs) const noexcept { return modular(*this) += rhs; }
  constexpr modular& operator += (const modular &rhs) noexcept { 
    if ((value += rhs.value) >= mod()) value -= mod(); 
    return *this; 
  }
 
  constexpr modular operator - (const modular &rhs) const noexcept { return modular(*this) -= rhs; }
  constexpr modular& operator -= (const modular &rhs) noexcept { 
    if ((value += mod() - rhs.value) >= mod()) value -= mod(); 
    return *this; 
  }
 
  constexpr modular operator * (const modular &rhs) const noexcept { return modular(*this) *= rhs; }
  constexpr modular& operator *= (const modular &rhs) noexcept { 
    value = (cover_type) value * rhs.value % mod();
    return *this;
  }
 
  constexpr modular operator / (const modular &rhs) const noexcept { return modular(*this) /= rhs; }
  constexpr modular& operator /= (const modular &rhs) noexcept { return (*this) *= inverse(rhs); }
 
  constexpr bool zero() const noexcept { return value == 0; }
  constexpr bool operator == (const modular &rhs) const noexcept { return value == rhs.value; }
  constexpr bool operator != (const modular &rhs) const noexcept { return value != rhs.value; }
 
  friend std::ostream& operator << (std::ostream &stream, const modular &rhs) { return stream << rhs.value; }
  friend constexpr modular inverse(const modular &val) noexcept { return val.inverse_helper<Modulus::is_prime>(); }
  friend constexpr modular power(modular val, cover_type exp) noexcept { 
    modular res(1);
    for (; exp > 0; exp >>= 1, val *= val) if (exp & 1) res *= val;
    return res;
  }
 
};
 
template <uint32_t Mod, bool IsPrime = true>
struct static_modulus { 
  static constexpr uint32_t mod() noexcept { return Mod; } 
  static constexpr bool is_prime = IsPrime;
};

template <uint32_t Id = 0, bool IsPrime = false>
struct dynamic_modulus {
  static uint32_t &mod() noexcept { static uint32_t val = 0; return val; }
  static constexpr bool is_prime = IsPrime;
};

template <uint32_t Mod, bool IsPrime = true>
using mint32_t = modular<static_modulus<Mod, IsPrime>>;
using rmint32_t = modular<dynamic_modulus<>>;

/*
 * @title Modint
 */
#line 16 "main.cpp"

using i32 = std::int32_t;
using i64 = std::int64_t;
using u32 = std::uint32_t;
using u64 = std::uint64_t;
using isize = std::ptrdiff_t;
using usize = std::size_t;

constexpr i32 inf32 = (u32) ~0 >> 2;
constexpr i64 inf64 = (u64) ~0 >> 2;

template <class T>
using Vec = std::vector<T>;

using Fp = mint32_t<1000000007>;

int main() {
  usize N;
  std::cin >> N;
  Vec<usize> A(N);
  for (auto &x: A) {
    std::cin >> x;
  }
  Vec<std::array<Fp, 300>> add(N);
  Vec<Fp> dp(N);
  dp[0] = Fp(1);
  for (auto i: range(0, N - 1)) {
    if (A[i] >= 300) {
      for (usize j = i + A[i]; j < N; j += A[i]) {
        dp[j] += dp[i];
      }
    }
    else {
      const auto j = i + A[i];
      if (j < N) {
        dp[j] += dp[i];
        add[j][A[i]] += dp[i];
      }
    }
    if (A[i] != 1) {
      dp[i + 1] += dp[i];
    }
    for (auto k: range(0, 300)) {
      const auto j = i + k;
      if (j < N) {
        dp[j] += add[i][k];
        add[j][k] += add[i][k];
      }
    }
  }
  std::cout << dp[N - 1] << '\n';
  return 0;
}
0