#424503 (C++17) No.977 アリス仕掛けの摩天楼

提出ソース

結果

問題	No.977 アリス仕掛けの摩天楼
ユーザー	Pachicobue
提出日時	2020-02-01 01:08:38
言語	C++17 (gcc 12.3.0 + boost 1.83.0)
結果	AC
実行時間	163 ms / 2,000 ms
コード長	10,736 bytes
コンパイル時間	2,581 ms
コンパイル使用メモリ	221,496 KB
実行使用メモリ	32,596 KB
最終ジャッジ日時	2024-09-17 15:10:34
合計ジャッジ時間	4,570 ms
ジャッジサーバーID （参考情報）	judge4 / judge2

このコードへのチャレンジ
（要ログイン）

テストケース

テストケース表示

入力	結果	実行時間実行使用メモリ
testcase_00	AC	2 ms 6,816 KB
testcase_01	AC	2 ms 6,940 KB
testcase_02	AC	2 ms 6,944 KB
testcase_03	AC	2 ms 6,944 KB
testcase_04	AC	2 ms 6,940 KB
testcase_05	AC	2 ms 6,944 KB
testcase_06	AC	2 ms 6,940 KB
testcase_07	AC	2 ms 6,940 KB
testcase_08	AC	2 ms 6,940 KB
testcase_09	AC	2 ms 6,940 KB
testcase_10	AC	2 ms 6,944 KB
testcase_11	AC	2 ms 6,940 KB
testcase_12	AC	2 ms 6,940 KB
testcase_13	AC	11 ms 6,940 KB
testcase_14	AC	11 ms 6,944 KB
testcase_15	AC	10 ms 6,944 KB
testcase_16	AC	11 ms 6,940 KB
testcase_17	AC	12 ms 7,040 KB
testcase_18	AC	32 ms 12,140 KB
testcase_19	AC	37 ms 14,208 KB
testcase_20	AC	62 ms 16,896 KB
testcase_21	AC	115 ms 22,656 KB
testcase_22	AC	163 ms 28,032 KB
testcase_23	AC	161 ms 31,560 KB
testcase_24	AC	146 ms 32,596 KB
testcase_25	AC	148 ms 31,288 KB

権限があれば一括ダウンロードができます

ソースコード

raw source code

#include <bits/stdc++.h>
// created [2020/02/01] 01:02:49
#pragma GCC diagnostic ignored "-Wsign-compare"
#pragma GCC diagnostic ignored "-Wsign-conversion"

using i32   = int32_t;
using i64   = int64_t;
using u32   = uint32_t;
using u64   = uint64_t;
using uint  = unsigned int;
using usize = std::size_t;
using ll    = long long;
using ull   = unsigned long long;
using ld    = long double;
template<typename T, usize n>
using arr = T (&)[n];
template<typename T, usize n>
using c_arr = const T (&)[n];
template<typename T>
using max_heap = std::priority_queue<T>;
template<typename T>
using min_heap = std::priority_queue<T, std::vector<T>, std::greater<T>>;
template<typename T> constexpr T popcount(const T u) { return u ? static_cast<T>(__builtin_popcountll(static_cast<u64>(u))) : static_cast<T>(0); }
template<typename T> constexpr T log2p1(const T u) { return u ? static_cast<T>(64 - __builtin_clzll(static_cast<u64>(u))) : static_cast<T>(0); }
template<typename T> constexpr T msbp1(const T u) { return log2p1(u); }
template<typename T> constexpr T lsbp1(const T u) { return __builtin_ffsll(u); }
template<typename T> constexpr T clog(const T u) { return u ? log2p1(u - 1) : static_cast<T>(u); }
template<typename T> constexpr bool ispow2(const T u) { return u and (static_cast<u64>(u) & static_cast<u64>(u - 1)) == 0; }
template<typename T> constexpr T ceil2(const T u) { return static_cast<T>(1) << clog(u); }
template<typename T> constexpr T floor2(const T u) { return u == 0 ? static_cast<T>(0) : static_cast<T>(1) << (log2p1(u) - 1); }
template<typename T> constexpr bool btest(const T mask, const usize ind) { return static_cast<bool>((static_cast<u64>(mask) >> ind) & static_cast<u64>(1)); }
template<typename T> void bset(T& mask, const usize ind) { mask |= (static_cast<T>(1) << ind); }
template<typename T> void breset(T& mask, const usize ind) { mask &= ~(static_cast<T>(1) << ind); }
template<typename T> void bflip(T& mask, const usize ind) { mask ^= (static_cast<T>(1) << ind); }
template<typename T> void bset(T& mask, const usize ind, const bool b) { (b ? bset(mask, ind) : breset(mask, ind)); }
template<typename T> constexpr T bcut(const T mask, const usize ind) { return ind == 0 ? static_cast<T>(0) : static_cast<T>((static_cast<u64>(mask) << (64 - ind)) >> (64 - ind)); }
template<typename T> bool chmin(T& a, const T& b) { return (a > b ? a = b, true : false); }
template<typename T> bool chmax(T& a, const T& b) { return (a < b ? a = b, true : false); }
constexpr unsigned int mod                  = 1000000007;
template<typename T> constexpr T inf_v      = std::numeric_limits<T>::max() / 4;
template<typename Real> constexpr Real pi_v = Real{3.141592653589793238462643383279502884};
auto mfp = [](auto&& f) { return [=](auto&&... args) { return f(f, std::forward<decltype(args)>(args)...); }; };

template<typename T>
T in()
{
    T v;
    return std::cin >> v, v;
}
template<typename T, typename Uint, usize n, usize i>
T in_v(typename std::enable_if<(i == n), c_arr<Uint, n>>::type) { return in<T>(); }
template<typename T, typename Uint, usize n, usize i>
auto in_v(typename std::enable_if<(i < n), c_arr<Uint, n>>::type& szs)
{
    const usize s = (usize)szs[i];
    std::vector<decltype(in_v<T, Uint, n, i + 1>(szs))> ans(s);
    for (usize j = 0; j < s; j++) { ans[j] = in_v<T, Uint, n, i + 1>(szs); }
    return ans;
}
template<typename T, typename Uint, usize n>
auto in_v(c_arr<Uint, n> szs) { return in_v<T, Uint, n, 0>(szs); }
template<typename... Types>
auto in_t() { return std::tuple<std::decay_t<Types>...>{in<Types>()...}; }
struct io_init
{
    io_init()
    {
        std::cin.tie(nullptr), std::ios::sync_with_stdio(false);
        std::cout << std::fixed << std::setprecision(20);
    }
    void clear()
    {
        std::cin.tie(), std::ios::sync_with_stdio(true);
    }
} io_setting;

int out() { return 0; }
template<typename T>
int out(const T& v) { return std::cout << v, 0; }
template<typename T>
int out(const std::vector<T>& v)
{
    for (usize i = 0; i < v.size(); i++) {
        if (i > 0) { std::cout << ' '; }
        out(v[i]);
    }
    return 0;
}
template<typename T1, typename T2>
int out(const std::pair<T1, T2>& v) { return out(v.first), std::cout << ' ', out(v.second), 0; }
template<typename T, typename... Args>
int out(const T& v, const Args... args) { return out(v), std::cout << ' ', out(args...), 0; }
template<typename... Args>
int outln(const Args... args) { return out(args...), std::cout << '\n', 0; }
template<typename... Args>
int outel(const Args... args) { return out(args...), std::cout << std::endl, 0; }
#    define SHOW(...) static_cast<void>(0)
constexpr ull TEN(const usize n) { return n == 0 ? 1ULL : TEN(n - 1) * 10ULL; }

template<typename T, typename Uint, usize n, usize i>
auto make_v(typename std::enable_if<(i == n), c_arr<Uint, n>>::type, const T& v = T{}) { return v; }
template<typename T, typename Uint, usize n, usize i>
auto make_v(typename std::enable_if<(i < n), c_arr<Uint, n>>::type szs, const T& v = T{})
{
    const usize s = (usize)szs[i];
    return std::vector<decltype(make_v<T, Uint, n, i + 1>(szs, v))>(s, make_v<T, Uint, n, i + 1>(szs, v));
}
template<typename T, typename Uint, usize n>
auto make_v(c_arr<Uint, n> szs, const T& t = T{}) { return make_v<T, Uint, n, 0>(szs, t); }

class unionfind
{
public:
    unionfind(const usize sz) : sz{sz}, rt(sz), comp_sz(sz, 1) { std::iota(rt.begin(), rt.end(), 0); }
    usize root_of(const usize a) { return assert(a < sz), rt[a] == a ? a : rt[a] = root_of(rt[a]); }
    bool unite(usize a, usize b)
    {
        assert(a < sz), assert(b < sz), a = root_of(a), b = root_of(b);
        if (a == b) { return false; }
        if (comp_sz[a] < comp_sz[b]) { std::swap(a, b); }
        return comp_sz[a] += comp_sz[b], rt[b] = a, true;
    }
    usize size_of(const usize a) { return assert(a < sz), comp_sz[root_of(a)]; }
    friend std::ostream& operator<<(std::ostream& os, const unionfind& uf)
    {
        os << "[";
        for (usize i = 0; i < uf.sz; i++) { os << uf.rt[i] << (i + 1 == uf.sz ? "" : ","); }
        return (os << "]\n");
    }

private:
    const usize sz;
    std::vector<usize> rt, comp_sz;
};


template<typename Cost = usize>
struct edge
{
    using cost_type = Cost;
    usize u, v;
    Cost c;
    edge(const usize u, const usize v) : u{u}, v{v}, c{1} {}
    edge(const usize u, const usize v, const Cost& c) : u{u}, v{v}, c{c} {}
    operator usize() const { return v; }
    usize from() const { return u; }
    usize to() const { return v; }
    Cost cost() const { return c; }
    friend std::ostream& operator<<(std::ostream& os, const edge& e) { return os << e.u << "->" << e.v << ":" << e.c; }
};
template<typename Edge>
class base_graph
{
public:
    base_graph(const usize n) : v{n}, es(n), res(n) {}
    void add_edge(const usize u, const usize v, const bool bi = false)
    {
        es[u].emplace_back(u, v), res[v].emplace_back(v, u);
        if (bi) { es[v].emplace_back(v, u), res[u].emplace_back(u, v); }
    }
    template<typename Cost>
    void add_edge(const usize u, const usize v, const Cost& c, const bool bi = false)
    {
        es[u].emplace_back(u, v, c), res[v].emplace_back(v, u, c);
        if (bi) { es[v].emplace_back(v, u, c), res[u].emplace_back(u, v, c); }
    }
    std::vector<Edge>& operator[](const usize u) { return es[u]; }
    const std::vector<Edge>& operator[](const usize u) const { return es[u]; }
    std::vector<Edge>& from(const usize u) { return es[u]; }
    const std::vector<Edge>& from(const usize u) const { return es[u]; }
    std::vector<Edge>& to(const usize v) { return res[v]; }
    const std::vector<Edge>& to(const usize v) const { return res[v]; }
    usize size() const { return v; }
    friend std::ostream& operator<<(std::ostream& os, const base_graph& g)
    {
        for (usize i = 0; i < g.v; i++) {
            for (const auto& e : g.es[i]) { os << e << '\n'; }
        }
        return os;
    }

private:
    usize v;
    std::vector<std::vector<Edge>> es, res;
};
template<typename Edge>
using base_tree = base_graph<Edge>;
using graph     = base_graph<edge<>>;
using tree      = base_graph<edge<>>;
template<typename Cost>
using cost_graph = base_graph<edge<Cost>>;
template<typename Cost>
using cost_tree = base_graph<edge<Cost>>;
template<typename Edge = edge<>>
class lowlink_manager
{
private:
    using P = std::pair<usize, usize>;
    const usize sz;
    std::vector<P> bs;
    std::vector<usize> ord, low, as;
    std::vector<bool> is_a;
    std::vector<std::vector<usize>> dfs_tree;

public:
    lowlink_manager(const base_tree<Edge>& g) : sz(g.size()), ord(sz, sz), low(sz, sz), is_a(sz, false), dfs_tree(sz)
    {
        usize num = 0;
        auto dfs  = [&](auto&& self, const usize s, const usize p) -> void {
            ord[s] = low[s] = num++;
            usize back      = 0;
            for (const auto& e : g[s]) {
                const usize to = e.to();
                if (ord[to] == sz) {
                    dfs_tree[s].push_back(to), self(self, to, s), low[s] = std::min(low[s], low[to]);
                } else {
                    if (p == to) { back++; }
                    if (p != to or back > 1) { low[s] = std::min(low[s], ord[to]); }
                }
            }
        };
        auto dfs2 = [&](auto&& self, const usize s) -> void {
            usize max = 0;
            for (const usize to : dfs_tree[s]) {
                max = std::max(max, low[to]);
                if (this->is_bridge(s, to)) { bs.push_back(std::minmax(s, to)); }
                self(self, to);
            }
            is_a[s] = ord[s] <= max and (s != 0 or dfs_tree[s].size() > 1);
            if (is_a[s]) { as.push_back(s); }
        };
        for (usize i = 0; i < sz; i++) {
            if (ord[i] != sz) { continue; }
            dfs(dfs, i, sz), dfs2(dfs2, i);
        }
    }
    bool is_art(const usize i) const { return is_a[i]; }
    bool is_bridge(const usize i, const usize j) const { return (ord[i] < ord[j]) ? ord[i] < low[j] : ord[j] < low[i]; }
    const std::vector<P>& bridges() const { return bs; }
    const std::vector<usize>& arts() const { return as; }
};
int main()
{
    const auto N = in<int>();
    unionfind uf(N);
    int c = N;
    graph g(N);
    for (int i = 0; i < N - 1; i++) {
        const auto [u, v] = in_t<int, int>();
        if (uf.unite(u, v)) { c--; }
        g.add_edge(u, v, true);
    }
    lowlink_manager lowlink(g);
    if (c >= 3) {
        outln("Alice");
    } else if (c == 1) {
        outln("Bob");
    } else {
        const auto bridge = lowlink.bridges();
        if (bridge.empty()) {
            outln("Bob");
        } else {
            outln("Alice");
        }
    }
    return 0;
}

yukicoder

結果

テストケース

ソースコード