結果

問題 No.1813 Magical Stones
ユーザー ei1333333
提出日時 2022-01-14 21:36:18
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 5,310 bytes
コンパイル時間 2,210 ms
コンパイル使用メモリ 209,064 KB
最終ジャッジ日時 2025-01-27 11:05:41
ジャッジサーバーID
（参考情報） 		judge5 / judge3
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ファイルパターン 結果
sample AC * 4
other AC * 12 WA * 28
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 #
プレゼンテーションモードにする

#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 Strongly-Connected-Components(強連結成分分解)
 */
template< typename T = int >
struct StronglyConnectedComponents : Graph< T > {
public:
  using Graph< T >::Graph;
  using Graph< T >::g;
  vector< int > comp;
  Graph< T > dag;
  vector< vector< int > > group;
  void build() {
    rg = Graph< T >(g.size());
    for(int i = 0; i < g.size(); i++) {
      for(auto &e: g[i]) {
        rg.add_directed_edge(e.to, e.from, e.cost);
      }
    }
    comp.assign(g.size(), -1);
    used.assign(g.size(), 0);
    for(int i = 0; i < g.size(); i++) dfs(i);
    reverse(begin(order), end(order));
    int ptr = 0;
    for(int i: order) if(comp[i] == -1) rdfs(i, ptr), ptr++;
    dag = Graph< T >(ptr);
    for(int i = 0; i < g.size(); i++) {
      for(auto &e: g[i]) {
        int x = comp[e.from], y = comp[e.to];
        if(x == y) continue;
        dag.add_directed_edge(x, y, e.cost);
      }
    }
    group.resize(ptr);
    for(int i = 0; i < g.size(); i++) {
      group[comp[i]].emplace_back(i);
    }
  }
  int operator[](int k) const {
    return comp[k];
  }
private:
  vector< int > order, used;
  Graph< T > rg;
  void dfs(int idx) {
    if(exchange(used[idx], true)) return;
    for(auto &to: g[idx]) dfs(to);
    order.push_back(idx);
  }
  void rdfs(int idx, int cnt) {
    if(comp[idx] != -1) return;
    comp[idx] = cnt;
    for(auto &to: rg.g[idx]) rdfs(to, cnt);
  }
};
int main() {
  int N, M;
  cin >> N >> M;
  StronglyConnectedComponents<> g(N);
  for(int i = 0; i < M; i++) {
    int a, b;
    cin >> a >> b;
    --a, --b;
    g.add_directed_edge(b, a);
  }
  g.build();
  N = (int) g.dag.size();
  vector< int > in(N), out(N);
  for(int i = 0; i < N; i++) {
    for(auto j: g.dag[i]) {
      in[j]++;
      out[i]++;
    }
  }
  int ret = 0;
  for(int i = 0; i < N; i++) {
    ret += in[i] == 0;
    ret += out[i] == 0;
  }
  if(N == 1) cout << 0 << "\n";
  else cout << (ret + 1) / 2 << "\n";
}
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