結果

問題 No.1812 Uribo Road
ユーザー ei1333333ei1333333
提出日時 2022-01-14 22:02:08
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 128 ms / 5,000 ms
コード長 5,239 bytes
コンパイル時間 2,566 ms
コンパイル使用メモリ 229,972 KB
実行使用メモリ 9,216 KB
最終ジャッジ日時 2024-04-30 14:44:29
合計ジャッジ時間 4,557 ms
ジャッジサーバーID
(参考情報)
judge4 / judge1
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 2 ms
6,816 KB
testcase_01 AC 2 ms
6,940 KB
testcase_02 AC 2 ms
6,940 KB
testcase_03 AC 22 ms
6,940 KB
testcase_04 AC 1 ms
6,944 KB
testcase_05 AC 1 ms
6,940 KB
testcase_06 AC 2 ms
6,944 KB
testcase_07 AC 4 ms
6,940 KB
testcase_08 AC 4 ms
6,944 KB
testcase_09 AC 4 ms
6,944 KB
testcase_10 AC 3 ms
6,940 KB
testcase_11 AC 3 ms
6,944 KB
testcase_12 AC 70 ms
8,576 KB
testcase_13 AC 48 ms
8,576 KB
testcase_14 AC 45 ms
8,320 KB
testcase_15 AC 30 ms
6,940 KB
testcase_16 AC 32 ms
6,944 KB
testcase_17 AC 90 ms
7,168 KB
testcase_18 AC 46 ms
7,552 KB
testcase_19 AC 128 ms
9,216 KB
testcase_20 AC 126 ms
9,216 KB
testcase_21 AC 106 ms
9,088 KB
testcase_22 AC 90 ms
9,216 KB
testcase_23 AC 9 ms
6,940 KB
testcase_24 AC 2 ms
6,940 KB
testcase_25 AC 12 ms
6,944 KB
testcase_26 AC 3 ms
6,940 KB
testcase_27 AC 24 ms
6,940 KB
testcase_28 AC 23 ms
6,940 KB
testcase_29 AC 2 ms
6,944 KB
testcase_30 AC 5 ms
6,940 KB
testcase_31 AC 78 ms
8,064 KB
testcase_32 AC 4 ms
6,944 KB
testcase_33 AC 31 ms
6,940 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

diff #

#include <bits/stdc++.h>

using namespace std;

using int64 = long long;
const int mod = 1e9 + 7;
// const int mod = 998244353;

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 {
  FixPoint(F &&f) : F(forward< F >(f)) {}

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

template< typename F >
inline decltype(auto) MFP(F &&f) {
  return FixPoint< F >{forward< F >(f)};
}

/**
 * @brief Graph Template(グラフテンプレート)
 */
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 > >;

/**
 * @brief Dijkstra(単一始点最短路)
 * @docs docs/dijkstra.md
 */
template< typename T >
struct ShortestPath {
  vector< T > dist;
  vector< int > from, id;
};

template< typename T >
ShortestPath< T > dijkstra(const Graph< T > &g, int s) {
  const auto INF = numeric_limits< T >::max();
  vector< T > dist(g.size(), INF);
  vector< int > from(g.size(), -1), id(g.size(), -1);
  using Pi = pair< T, int >;
  priority_queue< Pi, vector< Pi >, greater<> > que;
  dist[s] = 0;
  que.emplace(dist[s], s);
  while(!que.empty()) {
    T cost;
    int idx;
    tie(cost, idx) = que.top();
    que.pop();
    if(dist[idx] < cost) continue;
    for(auto &e: g.g[idx]) {
      auto next_cost = cost + e.cost;
      if(dist[e.to] <= next_cost) continue;
      dist[e.to] = next_cost;
      from[e.to] = idx;
      id[e.to] = e.idx;
      que.emplace(dist[e.to], e.to);
    }
  }
  return {dist, from, id};
}

int main() {
  int N, M, K;
  cin >> N >> M >> K;
  vector< int > R(K);
  cin >> R;
  for(auto &r: R) --r;
  Graph<> g(N);
  vector< int > A(M), B(M), C(M);
  for(int i = 0; i < M; i++) {
    cin >> A[i] >> B[i] >> C[i];
    --A[i], --B[i];
    g.add_edge(A[i], B[i], C[i]);
  }
  vector< map< int, int64 > > dp(1 << K);
  vector< vector< int > > dist(N);
  auto get_dist = [&](int u, int v) {
    if(dist[u].empty()) dist[u] = dijkstra(g, u).dist;
    return dist[u][v];
  };
  auto rec = MFP([&](auto rec, int bit, int u) -> int64 {
    if(bit == (1 << K) - 1) return get_dist(N - 1, u);
    if(dp[bit].count(u)) return dp[bit][u];
    int64 ret = infll;
    for(int i = 0; i < K; i++) {
      if((bit >> i) & 1) continue;
      chmin(ret, rec(bit | (1 << i), B[R[i]]) + get_dist(A[R[i]], u) + C[R[i]]);
      chmin(ret, rec(bit | (1 << i), A[R[i]]) + get_dist(B[R[i]], u) + C[R[i]]);
    }
    return dp[bit][u] = ret;
  });
  cout << rec(0, 0) << "\n";
}

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