test/verify/aoj-grl-5-c.test.cpp

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• Last update: 2025-08-16 01:23:21+09:00
• Problem: http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=GRL_5_C

Depends on

• Graph Template(グラフテンプレート) (graph/graph-template.hpp)
• Doubling-Lowest-Common-Ancestor(最小共通祖先) (graph/tree/doubling-lowest-common-ancestor.hpp)
• template/template.hpp

Code

// competitive-verifier: PROBLEM http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=GRL_5_C

#include "../../template/template.hpp"

#include "../../graph/tree/doubling-lowest-common-ancestor.hpp"

int main() {
  int N, Q;
  cin >> N;
  DoublingLowestCommonAncestor< int > dlca(N);
  for(int i = 0; i < N; i++) {
    int k;
    cin >> k;
    for(int j = 0; j < k; j++) {
      int c;
      cin >> c;
      dlca.add_edge(i, c);
    }
  }
  dlca.build();
  cin >> Q;
  for(int i = 0; i < Q; i++) {
    int u, v;
    cin >> u >> v;
    cout << dlca.lca(u, v) << "\n";
  }
}

#line 1 "test/verify/aoj-grl-5-c.test.cpp"
// competitive-verifier: PROBLEM http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=GRL_5_C

#line 1 "template/template.hpp"
#include <bits/stdc++.h>
#if __has_include(<atcoder/all>)
#include <atcoder/all>
#endif

using namespace std;

using int64 = long long;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
  }
} iosetup;

template <typename T1, typename T2>
ostream& operator<<(ostream& os, const pair<T1, T2>& p) {
  os << p.first << " " << p.second;
  return os;
}

template <typename T1, typename T2>
istream& operator>>(istream& is, pair<T1, T2>& p) {
  is >> p.first >> p.second;
  return is;
}

template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
  for (int i = 0; i < (int)v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template <typename T>
istream& operator>>(istream& is, vector<T>& v) {
  for (T& in : v) is >> in;
  return is;
}

template <typename T1, typename T2>
inline bool chmax(T1& a, T2 b) {
  return a < b && (a = b, true);
}

template <typename T1, typename T2>
inline bool chmin(T1& a, T2 b) {
  return a > b && (a = b, true);
}

template <typename T = int64>
vector<T> make_v(size_t a) {
  return vector<T>(a);
}

template <typename T, typename... Ts>
auto make_v(size_t a, Ts... ts) {
  return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}

template <typename T, typename V>
typename enable_if<is_class<T>::value == 0>::type fill_v(T& t, const V& v) {
  t = v;
}

template <typename T, typename V>
typename enable_if<is_class<T>::value != 0>::type fill_v(T& t, const V& v) {
  for (auto& e : t) fill_v(e, v);
}

template <typename F>
struct FixPoint : F {
  explicit FixPoint(F&& f) : F(std::forward<F>(f)) {}

  template <typename... Args>
  decltype(auto) operator()(Args&&... args) const {
    return F::operator()(*this, std::forward<Args>(args)...);
  }
};

template <typename F>
inline decltype(auto) MFP(F&& f) {
  return FixPoint<F>{std::forward<F>(f)};
}
#line 4 "test/verify/aoj-grl-5-c.test.cpp"

#line 2 "graph/tree/doubling-lowest-common-ancestor.hpp"

#line 2 "graph/graph-template.hpp"

template <typename T = int>
struct Edge {
  int from, to;
  T cost;
  int idx;

  Edge() = default;

  Edge(int from, int to, T cost = 1, int idx = -1)
      : from(from), to(to), cost(cost), idx(idx) {}

  operator int() const { return to; }
};

template <typename T = int>
struct Graph {
  vector<vector<Edge<T> > > g;
  int es;

  Graph() = default;

  explicit Graph(int n) : g(n), es(0) {}

  size_t size() const { return g.size(); }

  void add_directed_edge(int from, int to, T cost = 1) {
    g[from].emplace_back(from, to, cost, es++);
  }

  void add_edge(int from, int to, T cost = 1) {
    g[from].emplace_back(from, to, cost, es);
    g[to].emplace_back(to, from, cost, es++);
  }

  void read(int M, int padding = -1, bool weighted = false,
            bool directed = false) {
    for (int i = 0; i < M; i++) {
      int a, b;
      cin >> a >> b;
      a += padding;
      b += padding;
      T c = T(1);
      if (weighted) cin >> c;
      if (directed)
        add_directed_edge(a, b, c);
      else
        add_edge(a, b, c);
    }
  }

  inline vector<Edge<T> >& operator[](const int& k) { return g[k]; }

  inline const vector<Edge<T> >& operator[](const int& k) const { return g[k]; }
};

template <typename T = int>
using Edges = vector<Edge<T> >;
#line 4 "graph/tree/doubling-lowest-common-ancestor.hpp"

/**
 * @brief Doubling-Lowest-Common-Ancestor(最小共通祖先)
 *
 */
template <typename T>
struct DoublingLowestCommonAncestor : Graph<T> {
 public:
  using Graph<T>::g;
  vector<int> dep;
  vector<T> sum;
  vector<vector<int> > table;
  const int LOG;

  explicit DoublingLowestCommonAncestor(int n)
      : Graph<T>(n), LOG(32 - __builtin_clz(g.size())) {}

  explicit DoublingLowestCommonAncestor(const Graph<T>& g)
      : LOG(32 - __builtin_clz(g.size())), Graph<T>(g) {}

  void build(int root = 0) {
    dep.assign(g.size(), 0);
    sum.assign(g.size(), 0);
    table.assign(LOG, vector<int>(g.size(), -1));
    dfs(root, -1, 0);
    for (int k = 0; k + 1 < LOG; k++) {
      for (int i = 0; i < (int)table[k].size(); i++) {
        if (table[k][i] == -1)
          table[k + 1][i] = -1;
        else
          table[k + 1][i] = table[k][table[k][i]];
      }
    }
  }

  int lca(int u, int v) {
    if (dep[u] > dep[v]) swap(u, v);
    v = climb(v, dep[v] - dep[u]);
    if (u == v) return u;
    for (int i = LOG - 1; i >= 0; i--) {
      if (table[i][u] != table[i][v]) {
        u = table[i][u];
        v = table[i][v];
      }
    }
    return table[0][u];
  }

  int climb(int u, int k) {
    if (dep[u] < k) return -1;
    for (int i = LOG - 1; i >= 0; i--) {
      if ((k >> i) & 1) u = table[i][u];
    }
    return u;
  }

  T dist(int u, int v) { return sum[u] + sum[v] - 2 * sum[lca(u, v)]; }

 private:
  void dfs(int idx, int par, int d) {
    table[0][idx] = par;
    dep[idx] = d;
    for (auto& to : g[idx]) {
      if (to != par) {
        sum[to] = sum[idx] + to.cost;
        dfs(to, idx, d + 1);
      }
    }
  }
};
#line 6 "test/verify/aoj-grl-5-c.test.cpp"

int main() {
  int N, Q;
  cin >> N;
  DoublingLowestCommonAncestor< int > dlca(N);
  for(int i = 0; i < N; i++) {
    int k;
    cin >> k;
    for(int j = 0; j < k; j++) {
      int c;
      cin >> c;
      dlca.add_edge(i, c);
    }
  }
  dlca.build();
  cin >> Q;
  for(int i = 0; i < Q; i++) {
    int u, v;
    cin >> u >> v;
    cout << dlca.lca(u, v) << "\n";
  }
}

Test cases

Env	Name	Status	Elapsed	Memory
g++	00_sample_00.in	AC	5 ms	4 MB
g++	01_small_00.in	AC	5 ms	4 MB
g++	02_middle_00.in	AC	5 ms	4 MB
g++	02_middle_01.in	AC	5 ms	4 MB
g++	02_middle_02.in	AC	5 ms	4 MB
g++	02_middle_03.in	AC	5 ms	4 MB
g++	03_corner_00.in	AC	5 ms	4 MB
g++	03_corner_01.in	AC	5 ms	4 MB
g++	04_rand_00.in	AC	5 ms	4 MB
g++	04_rand_01.in	AC	5 ms	4 MB
g++	04_rand_02.in	AC	5 ms	4 MB
g++	04_rand_03.in	AC	5 ms	4 MB
g++	04_rand_04.in	AC	5 ms	4 MB
g++	04_rand_05.in	AC	5 ms	4 MB
g++	04_rand_06.in	AC	5 ms	4 MB
g++	04_rand_07.in	AC	5 ms	4 MB
g++	05_complete_00.in	AC	5 ms	4 MB
g++	05_complete_01.in	AC	5 ms	4 MB
g++	05_complete_02.in	AC	5 ms	4 MB
g++	05_complete_03.in	AC	5 ms	4 MB
g++	05_complete_04.in	AC	5 ms	4 MB
g++	05_complete_05.in	AC	6 ms	4 MB
g++	05_complete_06.in	AC	8 ms	5 MB
g++	05_complete_07.in	AC	18 ms	11 MB
g++	06_biased_00.in	AC	21 ms	5 MB
g++	06_biased_01.in	AC	46 ms	22 MB
g++	06_biased_02.in	AC	47 ms	18 MB
g++	06_biased_03.in	AC	44 ms	20 MB
g++	07_large_00.in	AC	54 ms	19 MB
g++	07_large_01.in	AC	53 ms	19 MB
g++	07_large_02.in	AC	60 ms	18 MB
g++	07_large_03.in	AC	60 ms	19 MB
clang++	00_sample_00.in	AC	5 ms	4 MB
clang++	01_small_00.in	AC	5 ms	4 MB
clang++	02_middle_00.in	AC	5 ms	4 MB
clang++	02_middle_01.in	AC	5 ms	4 MB
clang++	02_middle_02.in	AC	5 ms	4 MB
clang++	02_middle_03.in	AC	5 ms	4 MB
clang++	03_corner_00.in	AC	5 ms	4 MB
clang++	03_corner_01.in	AC	5 ms	4 MB
clang++	04_rand_00.in	AC	5 ms	4 MB
clang++	04_rand_01.in	AC	5 ms	4 MB
clang++	04_rand_02.in	AC	5 ms	4 MB
clang++	04_rand_03.in	AC	5 ms	4 MB
clang++	04_rand_04.in	AC	5 ms	4 MB
clang++	04_rand_05.in	AC	5 ms	4 MB
clang++	04_rand_06.in	AC	5 ms	4 MB
clang++	04_rand_07.in	AC	5 ms	4 MB
clang++	05_complete_00.in	AC	5 ms	4 MB
clang++	05_complete_01.in	AC	5 ms	4 MB
clang++	05_complete_02.in	AC	5 ms	4 MB
clang++	05_complete_03.in	AC	5 ms	4 MB
clang++	05_complete_04.in	AC	5 ms	4 MB
clang++	05_complete_05.in	AC	6 ms	4 MB
clang++	05_complete_06.in	AC	8 ms	5 MB
clang++	05_complete_07.in	AC	20 ms	11 MB
clang++	06_biased_00.in	AC	22 ms	5 MB
clang++	06_biased_01.in	AC	48 ms	24 MB
clang++	06_biased_02.in	AC	63 ms	18 MB
clang++	06_biased_03.in	AC	47 ms	21 MB
clang++	07_large_00.in	AC	66 ms	19 MB
clang++	07_large_01.in	AC	67 ms	19 MB
clang++	07_large_02.in	AC	75 ms	19 MB
clang++	07_large_03.in	AC	74 ms	19 MB

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