#354905 (C++17) No.845 最長の切符

提出ソース

結果

問題	No.845 最長の切符
ユーザー	Pachicobue
提出日時	2019-06-28 21:47:59
言語	C++17 (gcc 12.3.0 + boost 1.83.0)
結果	MLE
実行時間	-
コード長	9,122 bytes
コンパイル時間	2,451 ms
コンパイル使用メモリ	216,484 KB
実行使用メモリ	816,896 KB
最終ジャッジ日時	2024-07-02 04:35:40
合計ジャッジ時間	8,146 ms
ジャッジサーバーID （参考情報）	judge5 / judge2

このコードへのチャレンジ
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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	3 ms 5,248 KB
testcase_01	AC	3 ms 5,376 KB
testcase_02	AC	5 ms 5,376 KB
testcase_03	AC	2 ms 5,376 KB
testcase_04	AC	2 ms 5,376 KB
testcase_05	AC	2 ms 5,376 KB
testcase_06	AC	2 ms 5,376 KB
testcase_07	AC	2 ms 5,376 KB
testcase_08	AC	5 ms 5,376 KB
testcase_09	AC	3 ms 5,376 KB
testcase_10	AC	31 ms 14,848 KB
testcase_11	AC	5 ms 5,376 KB
testcase_12	AC	13 ms 7,552 KB
testcase_13	AC	4 ms 5,376 KB
testcase_14	AC	8 ms 6,016 KB
testcase_15	AC	832 ms 208,924 KB
testcase_16	MLE	-
testcase_17	--	-
testcase_18	--	-
testcase_19	--	-
testcase_20	--	-
testcase_21	--	-
testcase_22	--	-
testcase_23	--	-
testcase_24	--	-
testcase_25	--	-
testcase_26	--	-
testcase_27	--	-
testcase_28	--	-
testcase_29	--	-

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ソースコード

raw source code

#include <bits/stdc++.h>
#pragma GCC diagnostic ignored "-Wsign-compare"
#pragma GCC diagnostic ignored "-Wsign-conversion"
#define NDEBUG
#define SHOW(...) static_cast<void>(0)
//!===========================================================!//
//!  dP     dP                          dP                    !//
//!  88     88                          88                    !//
//!  88aaaaa88a .d8888b. .d8888b. .d888b88 .d8888b. 88d888b.  !//
//!  88     88  88ooood8 88'  '88 88'  '88 88ooood8 88'  '88  !//
//!  88     88  88.  ... 88.  .88 88.  .88 88.  ... 88        !//
//!  dP     dP  '88888P' '88888P8 '88888P8 '88888P' dP        !//
//!===========================================================!//
template <typename T>
T read()
{
    T v;
    return std::cin >> v, v;
}
template <typename T>
std::vector<T> readVec(const std::size_t l)
{
    std::vector<T> v(l);
    for (auto& e : v) { std::cin >> e; }
    return v;
}
using ld = long double;
using uint = unsigned int;
using ll = long long;
using ull = unsigned long long;
constexpr unsigned int MOD = 1000000007;
template <typename T>
constexpr T INF = std::numeric_limits<T>::max() / 4;
template <typename F>
constexpr F PI = static_cast<F>(3.1415926535897932385);
std::mt19937 mt{std::random_device{}()};
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); }
template <typename T>
std::vector<T> Vec(const std::size_t n, T v) { return std::vector<T>(n, v); }
template <class... Args>
auto Vec(const std::size_t n, Args... args) { return std::vector<decltype(Vec(args...))>(n, Vec(args...)); }
template <typename T>
constexpr T popCount(const T u)
{
#ifdef __has_builtin
    return u == 0 ? T(0) : (T)__builtin_popcountll(u);
#else
    unsigned long long v = static_cast<unsigned long long>(u);
    return v = (v & 0x5555555555555555ULL) + (v >> 1 & 0x5555555555555555ULL), v = (v & 0x3333333333333333ULL) + (v >> 2 & 0x3333333333333333ULL), v = (v + (v >> 4)) & 0x0F0F0F0F0F0F0F0FULL, static_cast<T>(v * 0x0101010101010101ULL >> 56 & 0x7f);
#endif
}
template <typename T>
constexpr T log2p1(const T u)
{
#ifdef __has_builtin
    return u == 0 ? T(0) : T(64 - __builtin_clzll(u));
#else
    unsigned long long v = static_cast<unsigned long long>(u);
    return v = static_cast<unsigned long long>(v), v |= (v >> 1), v |= (v >> 2), v |= (v >> 4), v |= (v >> 8), v |= (v >> 16), v |= (v >> 32), popCount(v);
#endif
}
template <typename T>
constexpr T clog(const T v) { return v == 0 ? T(0) : log2p1(v - 1); }
template <typename T>
constexpr T msbp1(const T v) { return log2p1(v); }
template <typename T>
constexpr T lsbp1(const T v)
{
#ifdef __has_builtin
    return __builtin_ffsll(v);
#else
    return v == 0 ? T(0) : popCount((v & (-v)) - T(1)) + T(1);
#endif
}
template <typename T>
constexpr bool ispow2(const T v) { return popCount(v) == 1; }
template <typename T>
constexpr T ceil2(const T v) { return v == 0 ? T(1) : T(1) << log2p1(v - 1); }
template <typename T>
constexpr T floor2(const T v) { return v == 0 ? T(0) : T(1) << (log2p1(v) - 1); }
//!=======================================================================================!//
//!   a88888b.                     dP       .88888.                             dP        !//
//!  d8'   '88                     88      d8'   '88                            88        !//
//!  88        .d8888b. .d8888b. d8888P    88        88d888b. .d8888b. 88d888b. 88d888b.  !//
//!  88        88'  '88 Y8ooooo.   88      88   YP88 88'  '88 88'  '88 88'  '88 88'  '88  !//
//!  Y8.   .88 88.  .88       88   88      Y8.   .88 88       88.  .88 88.  .88 88    88  !//
//!   Y88888P' '88888P' '88888P'   dP       '88888'  dP       '88888P8 88Y888P' dP    dP  !//
//!                                                                    88                 !//
//!                                                                    dP                 !//
//!=======================================================================================!//
template <typename Cost>
struct CostGraph
{
    CostGraph(const std::size_t v) : V{v}, edge(v), rev_edge(v) {}
    void addEdge(const std::size_t from, const std::size_t to, const Cost cost, const bool bi = false)
    {
        assert(from < V), assert(to < V);
        edge[from].push_back(Edge{to, cost}), rev_edge[to].push_back(Edge(from, cost));
        if (bi) { addEdge(to, from, cost, false); }
    }
    struct Edge
    {
        Edge(const std::size_t to, const Cost cost) : to{to}, cost{cost} {}
        const std::size_t to;
        const Cost cost;
        bool operator<(const Edge& e) const { return cost != e.cost ? cost < e.cost : to < e.to; }
    };
    const std::vector<Edge>& operator[](const std::size_t i) const { return assert(i < V), edge[i]; }
    friend std::ostream& operator<<(std::ostream& os, const CostGraph& g)
    {
        os << "[\n";
        for (std::size_t i = 0; i < g.V; i++) {
            for (const auto& e : g.edge[i]) { os << i << "->" << e.to << ":" << e.cost << "\n"; }
        }
        return (os << "]\n");
    }
    const std::size_t V;
    std::vector<std::vector<Edge>> edge, rev_edge;
};
template <typename Cost>
using CostTree = CostGraph<Cost>;
//!=================================================!//
//!   .88888.                             dP        !//
//!  d8'   '88                            88        !//
//!  88        88d888b. .d8888b. 88d888b. 88d888b.  !//
//!  88   YP88 88'  '88 88'  '88 88'  '88 88'  '88  !//
//!  Y8.   .88 88       88.  .88 88.  .88 88    88  !//
//!   '88888'  dP       '88888P8 88Y888P' dP    dP  !//
//!                              88                 !//
//!                              dP                 !//
//!=================================================!//
struct Graph
{
    Graph(const std::size_t v) : V{v}, edge(v), rev_edge(v) {}
    void addEdge(const std::size_t from, const std::size_t to, const bool bi = false)
    {
        assert(from < V), assert(to < V);
        edge[from].push_back(to), rev_edge[to].push_back(from);
        if (bi) { addEdge(to, from, false); }
    }
    const std::vector<std::size_t>& operator[](const std::size_t i) const { return assert(i < V), edge[i]; }
    friend std::ostream& operator<<(std::ostream& os, const Graph& g)
    {
        os << "[\n";
        for (std::size_t i = 0; i < g.V; i++) {
            for (const std::size_t to : g.edge[i]) { os << i << "->" << to << "\n"; }
        }
        return (os << "]\n");
    }
    std::size_t V;
    std::vector<std::vector<std::size_t>> edge, rev_edge;
};
using Tree = Graph;
//!=================================================================!//
//!  d888888P                   .d88888b                      dP    !//
//!     88                      88.    "'                     88    !//
//!     88    .d8888b. 88d888b. 'Y88888b. .d8888b. 88d888b. d8888P  !//
//!     88    88'  '88 88'  '88       '8b 88'  '88 88'  '88   88    !//
//!     88    88.  .88 88.  .88 d8'   .8P 88.  .88 88         88    !//
//!     dP    '88888P' 88Y888P'  Y88888P  '88888P' dP         dP    !//
//!                    88                                           !//
//!                    dP                                           !//
//!=================================================================!//
std::pair<bool, std::vector<std::size_t>> TopSort(const Graph& g)
{
    std::vector<std::size_t> srt, used(g.V, 0);
    auto dfs = [&](auto&& self, const std::size_t s) -> bool {
        if (used[s] == 1) {
            return false;
        } else if (used[s] == 0) {
            used[s] = 1;
            for (const std::size_t to : g.edge[s]) {
                if (not self(self, to)) { return false; }
            }
            used[s] = 2, srt.push_back(s);
        }
        return true;
    };
    for (std::size_t i = 0; i < g.V; i++) {
        if (not dfs(dfs, i)) { return {false, srt}; }
    }
    std::reverse(srt.begin(), srt.end());
    return {true, srt};
}
int main()
{
    const int N = read<int>(), M = read<int>();
    const int MASK = 1 << N;
    CostGraph<int> G(N * MASK);
    Graph G2(N * MASK);
    for (int i = 0, a, b, c; i < M; i++) {
        std::cin >> a >> b >> c, a--, b--;
        for (int j = 0; j < MASK; j++) {
            if (j & (1 << b)) { continue; }
            G.addEdge(a * MASK + j, b * MASK + j + (1 << b), c);
            G2.addEdge(a * MASK + j, b * MASK + j + (1 << b));
        }
        for (int j = 0; j < MASK; j++) {
            if (j & (1 << a)) { continue; }
            G.addEdge(b * MASK + j, a * MASK + j + (1 << a), c);
            G2.addEdge(b * MASK + j, a * MASK + j + (1 << a));
        }
    }
    const auto top = TopSort(G2);
    assert(top.first);
    std::vector<int> L(N * MASK + 1, 0);
    for (const int v : top.second) {
        const int s = v / MASK, vs = v % MASK;
        if (vs & (1 << s)) {
            for (const auto& e : G[v]) { chmax(L[e.to], L[v] + e.cost); }
        }
    }
    std::cout << *std::max_element(L.begin(), L.end()) << std::endl;
    return 0;
}

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結果

テストケース

ソースコード