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:x: alg/acted_monoid/cntsum_affine.hpp

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Code

#include "alg/monoid/add_pair.hpp"
#include "alg/monoid/affine.hpp"

template <typename E>
struct ActedMonoid_CntSum_Affine {
  using Monoid_X = Monoid_Add_Pair<E>;
  using Monoid_A = Monoid_Affine<E>;
  using X = typename Monoid_X::value_type;
  using A = typename Monoid_A::value_type;
  static constexpr X act(const X &x, const A &a, const ll &size) {
    return {x.fi, x.se * a.fi + x.fi * a.se};
  }
};
#line 2 "alg/monoid/add_pair.hpp"

template <typename E>
struct Monoid_Add_Pair {
  using value_type = pair<E, E>;
  using X = value_type;
  static constexpr X op(const X &x, const X &y) {
    return {x.fi + y.fi, x.se + y.se};
  }
  static constexpr X inverse(const X &x) { return {-x.fi, -x.se}; }
  static constexpr X unit() { return {0, 0}; }
  static constexpr bool commute = true;
};
#line 2 "alg/monoid/affine.hpp"

// op(F, G) = comp(G,F), F のあとで G
template <typename K>
struct Monoid_Affine {
  using F = pair<K, K>;
  using value_type = F;
  using X = value_type;
  static constexpr F op(const F &x, const F &y) noexcept {
    return F({x.first * y.first, x.second * y.first + y.second});
  }
  static constexpr F inverse(const F &x) {
    auto [a, b] = x;
    a = K(1) / a;
    return {a, a * (-b)};
  }
  static constexpr K eval(const F &f, K x) noexcept {
    return f.first * x + f.second;
  }
  static constexpr F unit() { return {K(1), K(0)}; }
  static constexpr bool commute = false;
};
#line 3 "alg/acted_monoid/cntsum_affine.hpp"

template <typename E>
struct ActedMonoid_CntSum_Affine {
  using Monoid_X = Monoid_Add_Pair<E>;
  using Monoid_A = Monoid_Affine<E>;
  using X = typename Monoid_X::value_type;
  using A = typename Monoid_A::value_type;
  static constexpr X act(const X &x, const A &a, const ll &size) {
    return {x.fi, x.se * a.fi + x.fi * a.se};
  }
};
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