結果

問題 No.924 紲星
コンテスト
ユーザー noshi91
提出日時 2019-11-08 21:45:44
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 1,480 ms / 4,000 ms
コード長 6,710 bytes
コンパイル時間 886 ms
コンパイル使用メモリ 86,848 KB
実行使用メモリ 106,624 KB
最終ジャッジ日時 2024-09-15 01:23:24
合計ジャッジ時間 13,912 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge5
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 * 16
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 # 

#include <algorithm>
#include <array>
#include <bitset>
#include <cstddef>
#include <tuple>
#include <utility>
#include <vector>

template <std::size_t BitLength, class Abelian> struct foldable_wavelet_matrix {
  using mapped_structure = Abelian;
  using mapped_type = typename mapped_structure::value_type;
  using key_type = std::bitset<BitLength>;

  struct bitvector {
    struct node_type;
    using container_type = std::vector<node_type>;
    using size_type = typename container_type::size_type;
    struct node_type {
      size_type count;
      mapped_type sum;
      constexpr node_type()
          : count(static_cast<size_type>(0)),
            sum(mapped_structure::identity()) {}
    };

    container_type vec;

    constexpr bitvector() : vec() {}

    constexpr void resize(const size_type size) {
      vec.resize(size + static_cast<size_type>(1));
    }
    constexpr void set(const size_type index) {
      vec[index].count = static_cast<size_type>(1);
    }
    template <class InputIterator>
    constexpr void build(const std::vector<InputIterator> &a) {
      for (size_type i = a.size(); i != static_cast<size_type>(0);) {
        --i;
        vec[i].count += vec[i + static_cast<size_type>(1)].count;
        vec[i].sum = mapped_structure::operation(
            a[i]->second, vec[i + static_cast<size_type>(1)].sum);
      }
    }

    constexpr size_type count(const size_type index) const {
      return vec[index].count;
    }
    constexpr size_type zeros() const { return vec.front().count; }
    constexpr mapped_type fold(const size_type first,
                               const size_type last) const {
      return mapped_structure::operation(
          vec[first].sum, mapped_structure::inverse(vec[last].sum));
    }
  };

  using size_type = typename bitvector::size_type;

  std::array<bitvector, BitLength> matrix;

  constexpr foldable_wavelet_matrix() : matrix() {}

  template <class InputIterator>
  explicit constexpr foldable_wavelet_matrix(InputIterator first,
                                             const InputIterator last) {
    using iterator = InputIterator;

    const size_type size = static_cast<size_type>(std::distance(first, last));
    std::vector<iterator> cur, pre;
    cur.reserve(size);
    for (; first != last; ++first) {
      cur.push_back(first);
    }
    pre = cur;
    std::size_t i = BitLength;
    while (i != static_cast<std::size_t>(0)) {
      --i;
      bitvector &vec = matrix[i];
      vec.resize(size);
      std::swap(cur, pre);
      typename std::vector<iterator>::iterator zero_itr = cur.begin(),
                                               one_itr = cur.end();
      for (size_type k = static_cast<size_type>(0); zero_itr != one_itr; ++k) {
        if (pre[k]->first.test(i)) {
          --one_itr;
          *one_itr = pre[k];
        } else {
          vec.set(k);
          *zero_itr = pre[k];
          ++zero_itr;
        }
      }
      std::reverse(one_itr, cur.end());
      vec.build(cur);
    }
  }

  constexpr std::tuple<mapped_type, mapped_type, mapped_type>
  fold_leg(size_type first, size_type last, const key_type &key) const {
    mapped_type less = mapped_structure::identity(),
                greater = mapped_structure::identity();
    std::size_t i = BitLength;
    while (i != static_cast<std::size_t>(0)) {
      --i;
      const bitvector &vec = matrix[i];
      const size_type f = vec.count(first), l = vec.count(last),
                      z = vec.zeros();
      if (key.test(i)) {
        less = mapped_structure::operation(std::move(less),
                                           vec.fold(z - f, z - l));
        first += f;
        last += l;
      } else {
        greater = mapped_structure::operation(vec.fold(first + f, last + l),
                                              std::move(greater));
        first = z - f;
        last = z - l;
      }
    }
    return std::forward_as_tuple(
        std::move(less), matrix.front().fold(first, last), std::move(greater));
  }

  constexpr mapped_type fold_range(const size_type first, const size_type last,
                                   const key_type &lower,
                                   const key_type &upper) const {
    return mapped_structure::operation(
        mapped_structure::inverse(std::get<0>(fold_leg(first, last, lower))),
        std::get<0>(fold_leg(first, last, upper)));
  }

  constexpr std::pair<mapped_type, mapped_type>
  fold_quantile(size_type first, size_type last, size_type k) const {
    mapped_type less = mapped_structure::identity(),
                greater = mapped_structure::identity();
    std::size_t i = BitLength;
    while (i != static_cast<std::size_t>(0)) {
      --i;
      const bitvector &vec = matrix[i];
      const size_type f = vec.count(first), l = vec.count(last),
                      z = vec.zeros();
      if (f - l <= k) {
        k -= f - l;
        less = mapped_structure::operation(std::move(less),
                                           vec.fold(z - f, z - l));
        first += f;
        last += l;
      } else {
        greater = mapped_structure::operation(vec.fold(first + f, last + l),
                                              std::move(greater));
        first = z - f;
        last = z - l;
      }
    }
    return std::make_pair(
        mapped_structure::operation(std::move(less),
                                    matrix.front().fold(first, first + k)),
        mapped_structure::operation(matrix.front().fold(first + k, last),
                                    std::move(greater)));
  }
};

template <class T> class plus_abelian {
public:
  using value_type = T;
  static value_type operation(const value_type &x, const value_type &y) {
    return x + y;
  }
  static value_type identity() { return static_cast<value_type>(0); }
  static value_type inverse(const value_type &x) { return -x; }
  static value_type reverse(const value_type &x) { return x; }
};

#include <iostream>
#include <vector>

int main() {
  using u64 = unsigned long long;
  using i64 = long long;
  using fwm_t = foldable_wavelet_matrix<31, plus_abelian<i64>>;
  int n, q;
  std::cin >> n >> q;
  std::vector<std::pair<typename fwm_t::key_type, i64>> a(n);
  for (auto &e : a) {
    i64 temp;
    std::cin >> temp;
    e = {temp + 1000000000, temp};
  }
  fwm_t wm(a.cbegin(), a.cend());
  for (int i = 0; i < q; ++i) {
    int l, r;
    std::cin >> l >> r;
    l -= 1;
    const i64 sep = (r - l) / 2;
    const auto v = wm.fold_quantile(l, r, sep);
    const auto u = wm.fold_quantile(l, r, sep + 1);
    const i64 base = u.first - v.first;
    std::cout << base * sep - v.first + v.second - base * (r - l - sep)
              << std::endl;
  }
}
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