結果

問題 No.3441 Sort Permutation 2
コンテスト
ユーザー risujiroh
提出日時 2026-02-06 21:30:36
言語 C++23
(gcc 15.2.0 + boost 1.89.0)
結果
AC  
実行時間 148 ms / 2,000 ms
コード長 4,506 bytes
記録
記録タグの例:
初AC ショートコード 純ショートコード 純主流ショートコード 最速実行時間
コンパイル時間 4,405 ms
コンパイル使用メモリ 365,704 KB
実行使用メモリ 39,512 KB
最終ジャッジ日時 2026-02-06 21:30:48
合計ジャッジ時間 11,663 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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ファイルパターン 結果
sample AC * 3
other AC * 41
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 #
raw source code

#if __INCLUDE_LEVEL__ == 0

#include __BASE_FILE__

void Solve() {
  int n;
  IN(n);
  vector<int> p(n);
  IN(OneBased(p));

  basic_string<bool> done(n, false);

  vector<int> cyc;
  cyc.reserve(n);

  vector<int> ans(n);

  for (int d : Rep1(1, n)) {
    for (int i = d; i <= n; i += d) {
      CsrArray<int>::Add(i, d);
    }
  }
  auto ds = CsrArray<int>::Build(n + 1);

  for (int s : Rep(0, n)) {
    if (done[s]) {
      continue;
    }

    cyc.clear();
    {
      int i = s;
      do {
        cyc.push_back(i);
        i = p[i];
      } while (i != s);
    }

    int g = 0;
    ranges::sort(cyc);
    for (int ci : Rep(1, Len(cyc))) {
      g = gcd(g, cyc[ci] - cyc[0]);
    }

    for (int d : ds[g]) {
      ans[d] += Len(cyc) - 1;
    }

    for (int i : cyc) {
      done[i] = true;
    }
  }

  ranges::for_each(ans | views::drop(1), LIFT(OUT));
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  Solve();
}

#elif __INCLUDE_LEVEL__ == 1

#include <bits/stdc++.h>

template <class T, int Id = -1>
class CsrArray {
 public:
  static void Reserve(int m) {
    buf_.reserve(m);
  }

  static void Add(int i, T x) {
    buf_.emplace_back(i, std::move(x));
  }

  static CsrArray Build(int n) {
    CsrArray ret;
    ret.pos_.resize(n + 1);
    for (int i : buf_ | std::views::keys) {
      ++ret.pos_[i];
    }
    std::partial_sum(ret.pos_.begin(), ret.pos_.end(), ret.pos_.begin());
    ret.data_.resize(ret.pos_[n]);
    for (auto& [i, x] : buf_ | std::views::reverse) {
      ret.data_[--ret.pos_[i]] = std::move(x);
    }
    buf_.clear();
    return ret;
  }

  int size() const { return int(pos_.size()) - 1; }

  auto operator[](int i) {
    return std::span<T>(data_.data() + pos_[i], data_.data() + pos_[i + 1]);
  }
  auto operator[](int i) const {
    return std::span<const T>(data_.data() + pos_[i], data_.data() + pos_[i + 1]);
  }

 private:
  static thread_local inline std::vector<std::pair<int, T>> buf_;
  std::vector<T> data_;
  std::vector<int> pos_;
};

template <class T>
concept MyRange =
    std::ranges::range<T> &&
    !std::convertible_to<T, std::string_view> &&
    !std::convertible_to<T, std::filesystem::path>;

template <class T>
concept MyTuple = std::__is_tuple_like<T>::value && !MyRange<T>;

namespace std {

istream& operator>>(istream& is, MyRange auto&& r) {
  for (auto&& e : r) {
    is >> e;
  }
  return is;
}

istream& operator>>(istream& is, MyTuple auto&& t) {
  apply([&](auto&... xs) { (is >> ... >> xs); }, t);
  return is;
}

ostream& operator<<(ostream& os, MyRange auto&& r) {
  auto sep = "";
  for (auto&& e : r) {
    os << exchange(sep, " ") << forward<decltype(e)>(e);
  }
  return os;
}

ostream& operator<<(ostream& os, MyTuple auto&& t) {
  auto sep = "";
  apply([&](auto&... xs) { ((os << exchange(sep, " ") << xs), ...); }, t);
  return os;
}

}  // namespace std

template <class T>
class OneBased {
 public:
  explicit OneBased(T&& x) : ref_(std::forward<T>(x)) {}

  template <class... Ts>
  requires(sizeof...(Ts) > 1)
      OneBased(Ts&&... xs) : ref_(std::forward_as_tuple(std::forward<Ts>(xs)...)) {}

  friend std::istream& operator>>(std::istream& is, OneBased x) {
    if constexpr (MyRange<T>) {
      for (auto&& e : x.ref_) {
        is >> ::OneBased(e);
      }
    } else if constexpr (MyTuple<T>) {
      std::apply([&](auto&... xs) { (is >> ... >> ::OneBased(xs)); }, x.ref_);
    } else {
      is >> x.ref_;
      --x.ref_;
    }
    return is;
  }

  friend std::ostream& operator<<(std::ostream& os, OneBased x) {
    if constexpr (MyRange<T>) {
      auto f = [](auto&& e) { return ::OneBased(std::forward<decltype(e)>(e)); };
      os << (x.ref_ | std::views::transform(f));
    } else if constexpr (MyTuple<T>) {
      std::apply([&](auto&... xs) { os << std::tuple(::OneBased(xs)...); }, x.ref_);
    } else {
      os << ++x.ref_;
      --x.ref_;
    }
    return os;
  }

 private:
  T ref_;
};

template <class T>
OneBased(T&&) -> OneBased<T>;

template <class... Ts>
OneBased(Ts&&...) -> OneBased<std::tuple<Ts...>>;

using namespace std;

#define LIFT(f) ([&](auto&&... xs) -> decltype(auto) { return f(forward<decltype(xs)>(xs)...); })
#define Rep(...) [](int l, int r) { return views::iota(min(l, r), r); }(__VA_ARGS__)
#define Rep1(...) [](int l, int r) { return Rep(l, r + 1); }(__VA_ARGS__)
#define Len(r) int(size(r))
#define IN(...) (cin >> forward_as_tuple(__VA_ARGS__))
#define OUT(...) (cout << forward_as_tuple(__VA_ARGS__) << '\n')

#endif  // __INCLUDE_LEVEL__ == 1
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