ds/offline_query/rectangle_add_point_sum.hpp

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• Last update: 2023-11-01 01:33:38+09:00
• Include: #include "ds/offline_query/rectangle_add_point_sum.hpp"

Depends on

• alg/monoid/add.hpp
• ds/fenwicktree/fenwicktree.hpp

Verified with

• test/mytest/rect_add_pt_sum.test.cpp
• test/yukicoder/2338.test.cpp
• test/yukicoder/2491.test.cpp

Code

#include "ds/fenwicktree/fenwicktree.hpp"

template <typename AbelGroup, typename XY, bool SMALL_X = false>
struct Rectangle_Add_Point_Sum {
  using G = typename AbelGroup::value_type;
  vector<tuple<XY, XY, XY, G>> rect;
  vector<tuple<int, XY, XY>> point;

  Rectangle_Add_Point_Sum() {}

  void add_query(XY x1, XY x2, XY y1, XY y2, G g) {
    rect.eb(y1, x1, x2, g), rect.eb(y2, x2, x1, g);
  }
  void sum_query(XY x, XY y) { point.eb(len(point), x, y); }

  vector<G> calc() {
    int N = rect.size(), Q = point.size();
    if (N == 0 || Q == 0) return vector<G>(Q, AbelGroup::unit());
    // X 方向の座圧
    int NX = 0;
    if (!SMALL_X) {
      sort(all(point),
           [&](auto &x, auto &y) -> bool { return get<1>(x) < get<1>(y); });
      vc<XY> keyX;
      keyX.reserve(Q);
      for (auto &&[i, a, b]: point) {
        if (len(keyX) == 0 || keyX.back() != a) { keyX.eb(a); }
        a = len(keyX) - 1;
      }
      for (auto &&[y, x1, x2, g]: rect) x1 = LB(keyX, x1), x2 = LB(keyX, x2);
      NX = len(keyX);
    }
    if (SMALL_X) {
      XY mx = infty<XY>;
      for (auto &&[i, x, y]: point) chmin(mx, x);
      for (auto &&[i, x, y]: point) x -= mx, chmax(NX, x + 1);
      for (auto &&[y, x1, x2, g]: rect) {
        x1 -= mx, x2 -= mx;
        x1 = max(0, min<int>(x1, NX)), x2 = max(0, min<int>(x2, NX));
      }
    }

    sort(all(point),
         [&](auto &x, auto &y) -> bool { return get<2>(x) < get<2>(y); });
    sort(all(rect),
         [&](auto &x, auto &y) -> bool { return get<0>(x) < get<0>(y); });
    FenwickTree<AbelGroup> bit(NX);
    vc<G> res(Q, AbelGroup::unit());
    int j = 0;
    FOR(i, Q) {
      auto [q, x, y] = point[i];
      while (j < N && get<0>(rect[j]) <= y) {
        auto [yy, x1, x2, g] = rect[j++];
        bit.add(x1, g), bit.add(x2, AbelGroup::inverse(g));
      }
      res[q] = bit.sum(x + 1);
    }
    return res;
  }
};

#line 2 "alg/monoid/add.hpp"

template <typename X>
struct Monoid_Add {
  using value_type = X;
  static constexpr X op(const X &x, const X &y) noexcept { return x + y; }
  static constexpr X inverse(const X &x) noexcept { return -x; }
  static constexpr X power(const X &x, ll n) noexcept { return X(n) * x; }
  static constexpr X unit() { return X(0); }
  static constexpr bool commute = true;
};
#line 3 "ds/fenwicktree/fenwicktree.hpp"

template <typename Monoid>
struct FenwickTree {
  using G = Monoid;
  using E = typename G::value_type;
  int n;
  vector<E> dat;
  E total;

  FenwickTree() {}
  FenwickTree(int n) { build(n); }
  template <typename F>
  FenwickTree(int n, F f) {
    build(n, f);
  }
  FenwickTree(const vc<E>& v) { build(v); }

  void build(int m) {
    n = m;
    dat.assign(m, G::unit());
    total = G::unit();
  }
  void build(const vc<E>& v) {
    build(len(v), [&](int i) -> E { return v[i]; });
  }
  template <typename F>
  void build(int m, F f) {
    n = m;
    dat.clear();
    dat.reserve(n);
    total = G::unit();
    FOR(i, n) { dat.eb(f(i)); }
    for (int i = 1; i <= n; ++i) {
      int j = i + (i & -i);
      if (j <= n) dat[j - 1] = G::op(dat[i - 1], dat[j - 1]);
    }
    total = prefix_sum(m);
  }

  E prod_all() { return total; }
  E sum_all() { return total; }
  E sum(int k) { return prefix_sum(k); }
  E prod(int k) { return prefix_prod(k); }
  E prefix_sum(int k) { return prefix_prod(k); }
  E prefix_prod(int k) {
    chmin(k, n);
    E ret = G::unit();
    for (; k > 0; k -= k & -k) ret = G::op(ret, dat[k - 1]);
    return ret;
  }
  E sum(int L, int R) { return prod(L, R); }
  E prod(int L, int R) {
    chmax(L, 0), chmin(R, n);
    if (L == 0) return prefix_prod(R);
    assert(0 <= L && L <= R && R <= n);
    E pos = G::unit(), neg = G::unit();
    while (L < R) { pos = G::op(pos, dat[R - 1]), R -= R & -R; }
    while (R < L) { neg = G::op(neg, dat[L - 1]), L -= L & -L; }
    return G::op(pos, G::inverse(neg));
  }

  void add(int k, E x) { multiply(k, x); }
  void multiply(int k, E x) {
    static_assert(G::commute);
    total = G::op(total, x);
    for (++k; k <= n; k += k & -k) dat[k - 1] = G::op(dat[k - 1], x);
  }

  template <class F>
  int max_right(const F check) {
    assert(check(G::unit()));
    int i = 0;
    E s = G::unit();
    int k = 1;
    while (2 * k <= n) k *= 2;
    while (k) {
      if (i + k - 1 < len(dat)) {
        E t = G::op(s, dat[i + k - 1]);
        if (check(t)) { i += k, s = t; }
      }
      k >>= 1;
    }
    return i;
  }

  // check(i, x)
  template <class F>
  int max_right_with_index(const F check) {
    assert(check(0, G::unit()));
    int i = 0;
    E s = G::unit();
    int k = 1;
    while (2 * k <= n) k *= 2;
    while (k) {
      if (i + k - 1 < len(dat)) {
        E t = G::op(s, dat[i + k - 1]);
        if (check(i + k, t)) { i += k, s = t; }
      }
      k >>= 1;
    }
    return i;
  }

  int kth(E k) {
    return max_right([&k](E x) -> bool { return x <= k; });
  }
};
#line 2 "ds/offline_query/rectangle_add_point_sum.hpp"

template <typename AbelGroup, typename XY, bool SMALL_X = false>
struct Rectangle_Add_Point_Sum {
  using G = typename AbelGroup::value_type;
  vector<tuple<XY, XY, XY, G>> rect;
  vector<tuple<int, XY, XY>> point;

  Rectangle_Add_Point_Sum() {}

  void add_query(XY x1, XY x2, XY y1, XY y2, G g) {
    rect.eb(y1, x1, x2, g), rect.eb(y2, x2, x1, g);
  }
  void sum_query(XY x, XY y) { point.eb(len(point), x, y); }

  vector<G> calc() {
    int N = rect.size(), Q = point.size();
    if (N == 0 || Q == 0) return vector<G>(Q, AbelGroup::unit());
    // X 方向の座圧
    int NX = 0;
    if (!SMALL_X) {
      sort(all(point),
           [&](auto &x, auto &y) -> bool { return get<1>(x) < get<1>(y); });
      vc<XY> keyX;
      keyX.reserve(Q);
      for (auto &&[i, a, b]: point) {
        if (len(keyX) == 0 || keyX.back() != a) { keyX.eb(a); }
        a = len(keyX) - 1;
      }
      for (auto &&[y, x1, x2, g]: rect) x1 = LB(keyX, x1), x2 = LB(keyX, x2);
      NX = len(keyX);
    }
    if (SMALL_X) {
      XY mx = infty<XY>;
      for (auto &&[i, x, y]: point) chmin(mx, x);
      for (auto &&[i, x, y]: point) x -= mx, chmax(NX, x + 1);
      for (auto &&[y, x1, x2, g]: rect) {
        x1 -= mx, x2 -= mx;
        x1 = max(0, min<int>(x1, NX)), x2 = max(0, min<int>(x2, NX));
      }
    }

    sort(all(point),
         [&](auto &x, auto &y) -> bool { return get<2>(x) < get<2>(y); });
    sort(all(rect),
         [&](auto &x, auto &y) -> bool { return get<0>(x) < get<0>(y); });
    FenwickTree<AbelGroup> bit(NX);
    vc<G> res(Q, AbelGroup::unit());
    int j = 0;
    FOR(i, Q) {
      auto [q, x, y] = point[i];
      while (j < N && get<0>(rect[j]) <= y) {
        auto [yy, x1, x2, g] = rect[j++];
        bit.add(x1, g), bit.add(x2, AbelGroup::inverse(g));
      }
      res[q] = bit.sum(x + 1);
    }
    return res;
  }
};

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