test/yosupo-judge/static_range_sum/main.test.cpp

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• Last update: 2021-04-23 23:44:44+09:00
• Problem: https://judge.yosupo.jp/problem/static_range_sum
• Link: View error logs on GitHub Actions

Depends on

• 1D cumulative sum (Mylib/Algorithm/cumulative_sum_1d.cpp)
• Input tuple (Mylib/IO/input_tuple.cpp)
• Input tuples (Mylib/IO/input_tuples.cpp)
• Input vector (Mylib/IO/input_vector.cpp)

Code

#define PROBLEM "https://judge.yosupo.jp/problem/static_range_sum"

#include <iostream>
#include "Mylib/Algorithm/cumulative_sum_1d.cpp"
#include "Mylib/IO/input_tuples.cpp"
#include "Mylib/IO/input_vector.cpp"

namespace hl = haar_lib;

int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);

  int N, Q;
  std::cin >> N >> Q;

  auto a = hl::input_vector<int64_t>(N);

  auto c = hl::cumulative_sum_1d_builder<int64_t>(N).update(a).build();

  for (auto [l, r] : hl::input_tuples<int, int>(Q)) {
    std::cout << c.fold(l, r) << "\n";
  }

  return 0;
}

#line 1 "test/yosupo-judge/static_range_sum/main.test.cpp"
#define PROBLEM "https://judge.yosupo.jp/problem/static_range_sum"

#include <iostream>
#line 2 "Mylib/Algorithm/cumulative_sum_1d.cpp"
#include <cassert>
#include <functional>
#include <vector>

namespace haar_lib {
  template <typename T>
  class cumulative_sum_1d {
  public:
    using value_type = T;

  private:
    template <typename>
    friend class cumulative_sum_1d_builder;
    int N_;
    std::vector<T> data_;

  public:
    T fold(int l, int r) const {
      assert(0 <= l and l <= r and r <= N_);
      return data_[r] - data_[l];
    }
  };

  template <typename T>
  class cumulative_sum_1d_builder {
    int N_;
    std::vector<T> data_;

  public:
    cumulative_sum_1d_builder() {}
    cumulative_sum_1d_builder(int N) : N_(N), data_(N + 1) {}

    auto& update(const std::vector<T>& a) {
      for (int i = 0; i < N_; ++i) data_[i + 1] += a[i];
      return *this;
    }

    auto& update(int i, const T& val) {
      assert(0 <= i and i < N_);
      data_[i + 1] += val;
      return *this;
    }

    auto build() const {
      cumulative_sum_1d<T> ret;
      ret.data_ = data_;
      ret.N_    = N_;
      for (int i = 0; i < N_; ++i) ret.data_[i + 1] += ret.data_[i];
      return ret;
    }
  };
}  // namespace haar_lib
#line 2 "Mylib/IO/input_tuples.cpp"
#include <initializer_list>
#line 4 "Mylib/IO/input_tuples.cpp"
#include <tuple>
#include <utility>
#line 6 "Mylib/IO/input_tuple.cpp"

namespace haar_lib {
  template <typename T, size_t... I>
  static void input_tuple_helper(std::istream &s, T &val, std::index_sequence<I...>) {
    (void) std::initializer_list<int>{(void(s >> std::get<I>(val)), 0)...};
  }

  template <typename T, typename U>
  std::istream &operator>>(std::istream &s, std::pair<T, U> &value) {
    s >> value.first >> value.second;
    return s;
  }

  template <typename... Args>
  std::istream &operator>>(std::istream &s, std::tuple<Args...> &value) {
    input_tuple_helper(s, value, std::make_index_sequence<sizeof...(Args)>());
    return s;
  }
}  // namespace haar_lib
#line 8 "Mylib/IO/input_tuples.cpp"

namespace haar_lib {
  template <typename... Args>
  class InputTuples {
    struct iter {
      using value_type = std::tuple<Args...>;
      value_type value;
      bool fetched = false;
      int N, c = 0;

      value_type operator*() {
        if (not fetched) {
          std::cin >> value;
        }
        return value;
      }

      void operator++() {
        ++c;
        fetched = false;
      }

      bool operator!=(iter &) const {
        return c < N;
      }

      iter(int N) : N(N) {}
    };

    int N;

  public:
    InputTuples(int N) : N(N) {}

    iter begin() const { return iter(N); }
    iter end() const { return iter(N); }
  };

  template <typename... Args>
  auto input_tuples(int N) {
    return InputTuples<Args...>(N);
  }
}  // namespace haar_lib
#line 4 "Mylib/IO/input_vector.cpp"

namespace haar_lib {
  template <typename T>
  std::vector<T> input_vector(int N) {
    std::vector<T> ret(N);
    for (int i = 0; i < N; ++i) std::cin >> ret[i];
    return ret;
  }

  template <typename T>
  std::vector<std::vector<T>> input_vector(int N, int M) {
    std::vector<std::vector<T>> ret(N);
    for (int i = 0; i < N; ++i) ret[i] = input_vector<T>(M);
    return ret;
  }
}  // namespace haar_lib
#line 7 "test/yosupo-judge/static_range_sum/main.test.cpp"

namespace hl = haar_lib;

int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);

  int N, Q;
  std::cin >> N >> Q;

  auto a = hl::input_vector<int64_t>(N);

  auto c = hl::cumulative_sum_1d_builder<int64_t>(N).update(a).build();

  for (auto [l, r] : hl::input_tuples<int, int>(Q)) {
    std::cout << c.fold(l, r) << "\n";
  }

  return 0;
}

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