Range update / Range sum
(Mylib/AlgebraicStructure/MonoidAction/update_sum.cpp)

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• Last update: 2021-04-23 23:44:44+09:00
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Operations

Requirements

Notes

Problems

References

Verified with

• test/aoj/DSL_2_I/main.test.cpp
• test/yukicoder/899/main.test.cpp

Code

#pragma once

namespace haar_lib {
  template <typename MonoidUpdate, typename MonoidGet>
  struct update_sum {
    using monoid_get        = MonoidGet;
    using monoid_update     = MonoidUpdate;
    using value_type_get    = typename MonoidGet::value_type;
    using value_type_update = typename MonoidUpdate::value_type;

    value_type_get operator()(value_type_get a, value_type_update b, int len) const {
      return b ? *b * len : a;
    }
  };
}  // namespace haar_lib

#line 2 "Mylib/AlgebraicStructure/MonoidAction/update_sum.cpp"

namespace haar_lib {
  template <typename MonoidUpdate, typename MonoidGet>
  struct update_sum {
    using monoid_get        = MonoidGet;
    using monoid_update     = MonoidUpdate;
    using value_type_get    = typename MonoidGet::value_type;
    using value_type_update = typename MonoidUpdate::value_type;

    value_type_get operator()(value_type_get a, value_type_update b, int len) const {
      return b ? *b * len : a;
    }
  };
}  // namespace haar_lib

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