結果

問題 No.1326 ふたりのDominator
ユーザー 横山緑
提出日時 2025-05-08 14:37:56
言語 C++23
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 132 ms / 2,000 ms
コード長 9,433 bytes
コンパイル時間 3,963 ms
コンパイル使用メモリ 296,572 KB
実行使用メモリ 55,584 KB
最終ジャッジ日時 2025-05-08 14:38:03
合計ジャッジ時間 7,051 ms
ジャッジサーバーID
(参考情報)
judge2 / judge3
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 1
other AC * 24
権限があれば一括ダウンロードができます
コンパイルメッセージ
tree/euler-tour.hpp: In instantiation of ‘struct EulerTour<Graph<bool> >’:
/home/y_midori/cp/test/test.test.cpp:11:23:   required from here
tree/euler-tour.hpp:7:27: warning: ‘EulerTour<Graph<bool> >’ has a field ‘SparseTable<std::pair<int, int>, <lambda closure object>EulerTour<Graph<bool> >::<lambda(EulerTour<Graph<bool> >::pii, EulerTour<Graph<bool> >::pii)>()> EulerTour<Graph<bool> >::rmq’ whose type has internal linkage [-Wsubobject-linkage]

ソースコード

diff #

#line 1 "/home/y_midori/cp/test/test.test.cpp"
#define PROBLEM "https://yukicoder.me/problems/no/1326"
#line 2 "template.hpp"
// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
template <class T>
concept Streamable = requires(ostream os, T &x) { os << x; };
template <class mint>
concept is_modint = requires(mint &x) {
    { x.val() } -> std::convertible_to<int>;
};
#ifdef LOCAL
#include <debug.hpp>
#else
#define debug(...)
#endif
template <Streamable T> void print_one(const T &value) { cout << value; }
template <is_modint T> void print_one(const T &value) { cout << value.val(); }
void print() { cout << '\n'; }
template <class T, class... Ts> void print(const T &a, const Ts &...b) {
    print_one(a);
    ((cout << ' ', print_one(b)), ...);
    cout << '\n';
}
template <ranges::range Iterable>
    requires(!Streamable<Iterable>)
void print(const Iterable &v) {
    for(auto it = v.begin(); it != v.end(); ++it) {
        if(it != v.begin())
            cout << " ";
        print_one(*it);
    }
    cout << '\n';
}
using vi = vector<int>;
using vii = vector<vector<int>>;
using pii = pair<int, int>;
using ll = long long;
using vl = vector<ll>;
using vll = vector<vl>;
using pll = pair<ll, ll>;
#define all(v) begin(v), end(v)
#define UNIQUE(v) ranges::sort(v), v.erase(unique(all(v)), end(v))
template <typename T> inline bool chmax(T &a, T b) {
    return ((a < b) ? (a = b, true) : (false));
}
template <typename T> inline bool chmin(T &a, T b) {
    return ((a > b) ? (a = b, true) : (false));
}
// https://trap.jp/post/1224/
template <class... T> constexpr auto min(T... a) {
    return min(initializer_list<common_type_t<T...>>{a...});
}
template <class... T> constexpr auto max(T... a) {
    return max(initializer_list<common_type_t<T...>>{a...});
}
template <class... T> void input(T &...a) { (cin >> ... >> a); }
template <class T> void input(vector<T> &a) {
    for(T &x : a)
        cin >> x;
}
#define INT(...)                                                               \
    int __VA_ARGS__;                                                           \
    input(__VA_ARGS__)
#define LL(...)                                                                \
    long long __VA_ARGS__;                                                     \
    input(__VA_ARGS__)
#define STR(...)                                                               \
    string __VA_ARGS__;                                                        \
    input(__VA_ARGS__)
#define REP1(a) for(ll i = 0; i < a; i++)
#define REP2(i, a) for(ll i = 0; i < a; i++)
#define REP3(i, a, b) for(ll i = a; i < b; i++)
#define REP4(i, a, b, c) for(ll i = a; i < b; i += c)
#define overload4(a, b, c, d, e, ...) e
#define rep(...) overload4(__VA_ARGS__, REP4, REP3, REP2, REP1)(__VA_ARGS__)
#define rep1(i, n) for(ll i = 1; i <= ((ll)n); ++i)
ll inf = 3e18;
vl dx = {1, -1, 0, 0};
vl dy = {0, 0, 1, -1};
template <class T> T floor(T x, T y) {
    return x / y - ((x ^ y) < 0 and x % y);
}
template <class T> T ceil(T x, T y) {
    return y < 0 ? floor(-x + -y - 1, -y) : floor(x + y - 1, y);
}
// yの符号に関わらず非負で定義 \bmod:texコマンド
template <class T> T bmod(T x, T y) {
    T m = x % y;
    return (m < 0) ? m + (y > 0 ? y : -y) : m;
}
#line 3 "graph/graph-template.hpp"
/**
 * @brief Graph Template(グラフテンプレート)
 * @see https://ei1333.github.io/library/graph/graph-template.hpp
 */
template <class T = ll> 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) {}
    Edge &operator=(const int &x) {
        to = x;
        return *this;
    }
    operator int() const { return to; }
};
template <class T = ll> struct Graph {
    using cost_type = T;
    vector<vector<Edge<T>>> g;
    int es; // edge_size
    Graph() = default;
    explicit Graph(int n) : g(n), es(0) {};
    int size() const { return ssize(g); }
    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++);
    }
    vector<Edge<T>> &operator[](const int &k) { return g[k]; }
    const vector<Edge<T>> &operator[](const int &k) const { return g[k]; }
    void read(int m, int padding = -1, bool weighted = false,
              bool directed = false) {
        for(int i = 0; i < m; ++i) {
            int a, b;
            T c(1);
            cin >> a >> b;
            a += padding;
            b += padding;
            if(weighted)
                cin >> c;
            if(directed)
                add_directed_edge(a, b, c);
            else
                add_edge(a, b, c);
        }
    }
};
#line 4 "graph/block-cut-tree.hpp"
/**
 * @brief ブロックカット木的な
 * https://maspypy.github.io/library/graph/block_cut.hpp
 * https://twitter.com/noshi91/status/1529858538650374144
 * N頂点の無向グラフがC個の二重連結成分を持つとき(N+C)頂点の森を作る
 * [0,N)のidxは元のグラフの頂点を表し[N,N+C)のidxは二重連結成分を表す
 * 辺(u,N+v)は頂点uがv番目の二重連結成分に属することを表す
 * 関節点<->次数2以上
 */
template <class G> Graph<bool> block_cut_tree(const G &g) {
    int n = g.size();
    Graph<bool> tree(n);
    vector<int> low(n, -1), ord(n, -1);
    int id = 0;
    vector<int> tmp;
    tree.g.reserve(2 * n);
    tmp.reserve(n);
    auto dfs = [&](auto &dfs, int cur, int p) -> void {
        ord[cur] = low[cur] = id++;
        tmp.emplace_back(cur);
        int cnt = 0;
        for(auto &to : g[cur]) {
            if(to == p)
                continue;
            if(ord[to] == -1) {
                int sz = ssize(tmp);
                ++cnt;
                dfs(dfs, to, cur);
                chmin(low[cur], low[to]);
                if((p == -1 and cnt > 1) or (p != -1 and low[to] >= ord[cur])) {
                    int k = tree.size();
                    tree.g.emplace_back();
                    tree.add_edge(cur, k);
                    while(ssize(tmp) > sz) {
                        tree.add_edge(tmp.back(), k);
                        tmp.pop_back();
                    }
                }
            } else {
                chmin(low[cur], ord[to]);
            }
        }
        if(p == -1) {
            int k = tree.size();
            tree.g.emplace_back();
            for(auto &i : tmp)
                tree.add_edge(i, k);
            tmp.clear();
        }
    };
    for(int i = 0; i < n; ++i) {
        if(ord[i] == -1)
            dfs(dfs, i, -1);
    }
    return tree;
}
#line 3 "data-structure/sparse-table.hpp"
/*
    auto opには
    [](int i,int j){return min(i,j);}や(int(*)(int,int))min
    を渡す
    ↑このmin,std::minじゃないな
    prod 単位元を渡していないので l==rは不可
*/
template <class T, auto op> struct SparseTable {
    SparseTable(const vector<T> &vec) {
        int n = vec.size();
        int b = bit_width(unsigned(n));
        v.resize(b);
        v[0] = vec;
        rep(i, b - 1) {
            v[i + 1].resize(n - (1 << i));
            rep(j, ssize(v[i]) - (1 << i)) {
                v[i + 1][j] = op(v[i][j], v[i][j + (1 << i)]);
            }
        }
    }
    T prod(int l, int r) const {
        if(l + 1 == r)
            return v[0][l];
        int b = bit_width(unsigned(r - l - 1)) - 1;
        return op(v[b][l], v[b][r - (1 << b)]);
    }

  private:
    vector<vector<T>> v;
};
#line 4 "tree/euler-tour.hpp"
// https://maspypy.com/euler-tour-%E3%81%AE%E3%81%8A%E5%8B%89%E5%BC%B7
// https://nyaannyaan.github.io/library/tree/euler-tour.hpp

template <class G> struct EulerTour {
    int root, id;
    vector<int> in, out, dep;
    using pii = pair<int, int>; // depth,vartex
    SparseTable<pii, [](pii a, pii b) { return a.first < b.first ? a : b; }>
        rmq;
    EulerTour(G &g, int root = 0)
        : root(root), id(0), in(g.size(), -1), out(g.size(), -1),
          dep(g.size(), 0), rmq([&] {
              vector<pii> vec;
              vec.reserve(2 * g.size());
              dfs(g, root, -1, vec);
              return vec;
          }()) {}
    int lca(int x, int y) const {
        int ix = in[x], iy = in[y];
        if(ix > iy)
            swap(ix, iy);
        return rmq.prod(ix, iy + 1).second;
    }
    int dist(int x, int y) const {
        int l = lca(x, y);
        return dep[x] + dep[y] - 2 * dep[l];
    }

  private:
    void dfs(G &g, int now, int prev, vector<pii> &vec) {
        vec.push_back({dep[now], now});
        in[now] = id++;
        for(auto nex : g[now]) {
            if(nex == prev)
                continue;
            dep[nex] = dep[now] + 1;
            dfs(g, nex, now, vec);
        }
        vec.push_back({dep[now] - 1, prev});
        out[now] = id++;
    }
};
#line 6 "/home/y_midori/cp/test/test.test.cpp"
void solve() {
    INT(n, m);
    Graph<bool> g(n);
    g.read(m);
    auto bct = block_cut_tree(g);
    EulerTour tour(bct);
    INT(q);
    while(q--) {
        INT(x, y);
        --x, --y;
        print((tour.dist(x, y) - 1) / 2);
    }
}
int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    solve();
}
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