test/verify/yosupo-dynamic-tree-vertex-add-path-sum-4.test.cpp

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• Last update: 2026-08-10 15:44:16+00:00
• Problem: https://judge.yosupo.jp/problem/dynamic_tree_vertex_add_path_sum

Depends on

• Dynamic Tree Builder (for Vertex) (structure/dynamic-tree/dynamic-tree-builder-for-vertex.hpp)
• Link Cut Tree (structure/dynamic-tree/link-cut-tree.hpp)
• structure/dynamic-tree/vertex-set-path-sum.hpp

Code

// clang-format off
// competitive-verifier: PROBLEM https://judge.yosupo.jp/problem/dynamic_tree_vertex_add_path_sum
// clang-format on

#include <iostream>
#include <vector>

#include "../../structure/dynamic-tree/dynamic-tree-builder-for-vertex.hpp"
#include "../../structure/dynamic-tree/vertex-set-path-sum.hpp"

using namespace std;

int main() {
  int N, Q;
  cin >> N >> Q;
  DynamicTreeBuilderForVertex<LinkCutTree, VertexSetPathSum<long long> > g(N);
  for (int i = 0; i < N; i++) {
    long long x;
    cin >> x;
    g.set_vertex(i, {x});
  }
  for (int i = 1; i < N; i++) {
    int a, b;
    cin >> a >> b;
    g.add_edge(a, b);
  }
  g.build();
  while (Q--) {
    int t;
    cin >> t;
    if (t == 0) {
      int u, v, w, x;
      cin >> u >> v >> w >> x;
      g.evert(g.vs[u]);
      g.cut(g.vs[v]);
      g.evert(g.vs[w]);
      g.link(g.vs[w], g.vs[x]);
    } else if (t == 1) {
      int v;
      long long x;
      cin >> v >> x;
      g.set_key(g.vs[v], {g.vs[v]->info.v + x});
    } else {
      int v, p;
      cin >> v >> p;
      cout << g.query_path(g.vs[p], g.vs[v]).sum << "\n";
    }
  }
}

#line 1 "test/verify/yosupo-dynamic-tree-vertex-add-path-sum-4.test.cpp"
// clang-format off
// competitive-verifier: PROBLEM https://judge.yosupo.jp/problem/dynamic_tree_vertex_add_path_sum
// clang-format on

#include <iostream>
#include <vector>

#line 2 "structure/dynamic-tree/dynamic-tree-builder-for-vertex.hpp"

#include <cassert>
#include <utility>
#line 6 "structure/dynamic-tree/dynamic-tree-builder-for-vertex.hpp"

template <template <typename> typename DynamicTree, typename TreeDPInfo>
struct DynamicTreeBuilderForVertex : DynamicTree<TreeDPInfo> {
 private:
  using DT = DynamicTree<TreeDPInfo>;
  using Info = typename TreeDPInfo::Info;

  int n;
  std::vector<std::vector<int> > g;

 public:
  using DT::alloc;
  using DT::link;

  std::vector<typename DT::NP> vs;

  explicit DynamicTreeBuilderForVertex(int n) : n(n), g(n), vs(n) {}

  void set_vertex(int u, const Info& info) {
    assert(0 <= u and u < n);
    vs[u] = this->alloc(info);
  }

  void add_edge(int u, int v) {
    assert(0 <= u and u < n);
    assert(0 <= v and v < n);
    assert(u != v);
    g[u].emplace_back(v);
    g[v].emplace_back(u);
  }

  void build(int r = 0) {
    std::vector<std::pair<int, int> > que;
    que.reserve(n);
    que.emplace_back(r, -1);
    while (not que.empty()) {
      auto [u, p] = que.back();
      que.pop_back();
      for (auto& v : g[u]) {
        if (v == p) continue;
        que.emplace_back(v, u);
        link(vs[v], vs[u]);
      }
    }
  }
};
#line 2 "structure/dynamic-tree/vertex-set-path-sum.hpp"

#line 2 "structure/dynamic-tree/link-cut-tree.hpp"

#include <stdexcept>
#line 6 "structure/dynamic-tree/link-cut-tree.hpp"

template <typename TreeDPInfo>
struct LinkCutTree {
  using Path = typename TreeDPInfo::Path;
  using Info = typename TreeDPInfo::Info;

 private:
  struct Node {
    Node *l, *r, *p;

    Info info;

    Path sum, mus;

    bool rev;

    bool is_root() const { return not p or (p->l != this and p->r != this); }

    Node(const Info& info)
        : info(info), l(nullptr), r(nullptr), p(nullptr), rev(false) {}
  };

 public:
  using NP = Node*;

 private:
  void toggle(NP t) {
    std::swap(t->l, t->r);
    std::swap(t->sum, t->mus);
    t->rev ^= true;
  }

  void rotr(NP t) {
    NP x = t->p, y = x->p;
    push(x), push(t);
    if ((x->l = t->r)) t->r->p = x;
    t->r = x, x->p = t;
    update(x), update(t);
    if ((t->p = y)) {
      if (y->l == x) y->l = t;
      if (y->r == x) y->r = t;
    }
  }

  void rotl(NP t) {
    NP x = t->p, y = x->p;
    push(x), push(t);
    if ((x->r = t->l)) t->l->p = x;
    t->l = x, x->p = t;
    update(x), update(t);
    if ((t->p = y)) {
      if (y->l == x) y->l = t;
      if (y->r == x) y->r = t;
    }
  }

 public:
  LinkCutTree() = default;

  void push(NP t) {
    if (t->rev) {
      if (t->l) toggle(t->l);
      if (t->r) toggle(t->r);
      t->rev = false;
    }
  }

  void push_rev(NP t) {
    if (t->rev) {
      if (t->l) toggle(t->l);
      if (t->r) toggle(t->r);
      t->rev = false;
    }
  }

  void update(NP t) {
    Path key = TreeDPInfo::vertex(t->info);
    t->sum = key;
    t->mus = key;
    if (t->l) {
      t->sum = TreeDPInfo::compress(t->l->sum, t->sum);
      t->mus = TreeDPInfo::compress(t->mus, t->l->mus);
    }
    if (t->r) {
      t->sum = TreeDPInfo::compress(t->sum, t->r->sum);
      t->mus = TreeDPInfo::compress(t->r->mus, t->mus);
    }
  }

  void splay(NP t) {
    push(t);
    while (not t->is_root()) {
      NP q = t->p;
      if (q->is_root()) {
        push_rev(q), push_rev(t);
        if (q->l == t)
          rotr(t);
        else
          rotl(t);
      } else {
        NP r = q->p;
        push_rev(r), push_rev(q), push_rev(t);
        if (r->l == q) {
          if (q->l == t)
            rotr(q), rotr(t);
          else
            rotl(t), rotr(t);
        } else {
          if (q->r == t)
            rotl(q), rotl(t);
          else
            rotr(t), rotl(t);
        }
      }
    }
  }

  NP expose(NP t) {
    NP rp = nullptr;
    for (NP cur = t; cur; cur = cur->p) {
      splay(cur);
      cur->r = rp;
      update(cur);
      rp = cur;
    }
    splay(t);
    return rp;
  }

  void link(NP child, NP parent) {
    if (is_connected(child, parent)) {
      throw std::runtime_error(
          "child and parent must be different connected components");
    }
    if (child->l) {
      throw std::runtime_error("child must be root");
    }
    child->p = parent;
    parent->r = child;
    update(parent);
  }

  void cut(NP child) {
    expose(child);
    NP parent = child->l;
    if (not parent) {
      throw std::runtime_error("child must not be root");
    }
    child->l = nullptr;
    parent->p = nullptr;
    update(child);
  }

  void evert(NP t) {
    expose(t);
    toggle(t);
    push(t);
  }

  NP alloc(const Info& v) {
    NP t = new Node(v);
    update(t);
    return t;
  }

  bool is_connected(NP u, NP v) {
    expose(u), expose(v);
    return u == v or u->p;
  }

  std::vector<NP> build(std::vector<Info>& vs) {
    std::vector<NP> nodes(vs.size());
    for (int i = 0; i < (int)vs.size(); i++) {
      nodes[i] = alloc(vs[i]);
    }
    return nodes;
  }

  NP lca(NP u, NP v) {
    if (not is_connected(u, v)) return nullptr;
    expose(u);
    return expose(v);
  }

  void set_key(NP t, const Info& v) {
    expose(t);
    t->info = std::move(v);
    update(t);
  }

  const Path& query_path(NP u) {
    expose(u);
    return u->sum;
  }

  const Path& query_path(NP u, NP v) {
    evert(u);
    return query_path(v);
  }

  template <typename C>
  std::pair<NP, Path> find_first(NP u, const C& check) {
    expose(u);
    Path sum = TreeDPInfo::vertex(u->info);
    if (check(sum)) return {u, sum};
    u = u->l;
    while (u) {
      push(u);
      if (u->r) {
        Path nxt = TreeDPInfo::compress(u->r->sum, sum);
        if (check(nxt)) {
          u = u->r;
          continue;
        }
        sum = nxt;
      }
      Path nxt = TreeDPInfo::compress(TreeDPInfo::vertex(u->info), sum);
      if (check(nxt)) {
        splay(u);
        return {u, nxt};
      }
      sum = nxt;
      u = u->l;
    }
    return {nullptr, sum};
  }
};

/*
struct TreeDPInfo {
  struct Path {};
  struct Info {};
  static Path vertex(const Info& u) {}
  static Path compress(const Path& p, const Path& c) {}
};
*/
#line 4 "structure/dynamic-tree/vertex-set-path-sum.hpp"

template <typename T>
struct VertexSetPathSum {
  struct Path {
    T sum;
  };
  struct Info {
    T v;
  };

  static Path vertex(const Info& u) { return {u.v}; }
  static Path compress(const Path& p, const Path& c) { return {p.sum + c.sum}; }
};
#line 10 "test/verify/yosupo-dynamic-tree-vertex-add-path-sum-4.test.cpp"

using namespace std;

int main() {
  int N, Q;
  cin >> N >> Q;
  DynamicTreeBuilderForVertex<LinkCutTree, VertexSetPathSum<long long> > g(N);
  for (int i = 0; i < N; i++) {
    long long x;
    cin >> x;
    g.set_vertex(i, {x});
  }
  for (int i = 1; i < N; i++) {
    int a, b;
    cin >> a >> b;
    g.add_edge(a, b);
  }
  g.build();
  while (Q--) {
    int t;
    cin >> t;
    if (t == 0) {
      int u, v, w, x;
      cin >> u >> v >> w >> x;
      g.evert(g.vs[u]);
      g.cut(g.vs[v]);
      g.evert(g.vs[w]);
      g.link(g.vs[w], g.vs[x]);
    } else if (t == 1) {
      int v;
      long long x;
      cin >> v >> x;
      g.set_key(g.vs[v], {g.vs[v]->info.v + x});
    } else {
      int v, p;
      cin >> v >> p;
      cout << g.query_path(g.vs[p], g.vs[v]).sum << "\n";
    }
  }
}

Test cases

Env	Name	Status	Elapsed	Memory
g++	almost_line_00	AC	878 ms	28 MB
g++	almost_line_01	AC	955 ms	28 MB
g++	example_00	AC	2 ms	4 MB
g++	issue_1216_00	AC	439 ms	28 MB
g++	max_random_00	AC	653 ms	29 MB
g++	max_random_01	AC	656 ms	29 MB
g++	max_random_02	AC	638 ms	29 MB
g++	random_00	AC	514 ms	20 MB
g++	random_01	AC	466 ms	22 MB
g++	random_02	AC	225 ms	10 MB
g++	random_03	AC	208 ms	25 MB
g++	random_04	AC	183 ms	5 MB
g++	small_00	AC	3 ms	4 MB
g++	small_01	AC	2 ms	4 MB
g++	small_02	AC	2 ms	4 MB
clang++	almost_line_00	AC	1051 ms	28 MB
clang++	almost_line_01	AC	990 ms	28 MB
clang++	example_00	AC	2 ms	4 MB
clang++	issue_1216_00	AC	398 ms	28 MB
clang++	max_random_00	AC	717 ms	29 MB
clang++	max_random_01	AC	795 ms	29 MB
clang++	max_random_02	AC	707 ms	29 MB
clang++	random_00	AC	481 ms	19 MB
clang++	random_01	AC	601 ms	22 MB
clang++	random_02	AC	266 ms	10 MB
clang++	random_03	AC	253 ms	25 MB
clang++	random_04	AC	160 ms	5 MB
clang++	small_00	AC	3 ms	4 MB
clang++	small_01	AC	3 ms	4 MB
clang++	small_02	AC	3 ms	4 MB

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