結果

問題 No.1817 Reversed Edges
ユーザー maimai
提出日時 2022-01-21 23:32:08
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 36 ms / 2,000 ms
コード長 6,762 bytes
コンパイル時間 3,059 ms
コンパイル使用メモリ 222,424 KB
実行使用メモリ 13,568 KB
最終ジャッジ日時 2024-05-04 15:08:44
合計ジャッジ時間 4,258 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge4
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
5,248 KB
testcase_01 AC 2 ms
5,376 KB
testcase_02 AC 2 ms
5,376 KB
testcase_03 AC 1 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 30 ms
9,528 KB
testcase_08 AC 15 ms
6,172 KB
testcase_09 AC 28 ms
9,128 KB
testcase_10 AC 16 ms
6,628 KB
testcase_11 AC 21 ms
7,660 KB
testcase_12 AC 33 ms
10,328 KB
testcase_13 AC 36 ms
10,328 KB
testcase_14 AC 33 ms
10,332 KB
testcase_15 AC 33 ms
10,204 KB
testcase_16 AC 34 ms
10,336 KB
testcase_17 AC 34 ms
10,332 KB
testcase_18 AC 33 ms
10,460 KB
testcase_19 AC 32 ms
10,332 KB
testcase_20 AC 34 ms
10,464 KB
testcase_21 AC 34 ms
10,328 KB
testcase_22 AC 13 ms
10,628 KB
testcase_23 AC 14 ms
10,636 KB
testcase_24 AC 21 ms
13,568 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 # 

#pragma GCC optimize("O3")
#include <bits/stdc++.h>

// clang-format off
using namespace std;
using ll = long long int;

#define all(v) (v).begin(),(v).end()
#define repeat(cnt,l) for(typename remove_const<typename remove_reference<decltype(l)>::type>::type cnt={};(cnt)<(l);++(cnt))
#define rrepeat(cnt,l) for(auto cnt=(l)-1;0<=(cnt);--(cnt))
#define iterate(cnt,b,e) for(auto cnt=(b);(cnt)!=(e);++(cnt))
#define upto(cnt,b,e,step) for(auto cnt=(b);(cnt)<=(e);(cnt)+=(step))
#define downto(cnt,b,e,step) for(auto cnt=(b);(e)<=(cnt);(cnt)-=(step))
const long long MD = 998244353; const long double PI = 3.1415926535897932384626433832795L;
template<typename T1, typename T2> inline ostream& operator <<(ostream &o, const pair<T1, T2> p) { o << '(' << p.first << ':' << p.second << ')'; return o; }
template<typename T> inline T& chmax(T& to, const T& val) { return to = max(to, val); }
template<typename T> inline T& chmin(T& to, const T& val) { return to = min(to, val); }
void bye(string s, int code = 0) { cout << s << endl; exit(code); }
mt19937_64 randdev(8901016);
template<typename T, typename Random = decltype(randdev), typename enable_if<is_integral<T>::value>::type* = nullptr>
inline T rand(T l, T h, Random& rand = randdev) { return uniform_int_distribution<T>(l, h)(rand); }
template<typename T, typename Random = decltype(randdev), typename enable_if<is_floating_point<T>::value>::type* = nullptr>
inline T rand(T l, T h, Random& rand = randdev) { return uniform_real_distribution<T>(l, h)(rand); }template<typename T>
static ostream& operator<<(ostream& o, const std::vector<T>& v) {
  o << "[ "; for(const auto& e : v) o<<e<<' '; return o << ']';
}

template <typename I> struct MyRangeFormat{ I b,e; MyRangeFormat(I _b, I _e):b(_b),e(_e){} };
template<typename I> static ostream& operator<<(ostream& o, const MyRangeFormat<I>& f) {
  o << "[ "; iterate(i,f.b,f.e) o<<*i<<' '; return o << ']';
}
template <typename I> struct MyMatrixFormat{
  const I& p; long long n, m;
  MyMatrixFormat(const I& _p, long long _n, long long _m):p(_p),n(_n),m(_m){}
};
template<typename I> static ostream& operator<<(ostream& o, const MyMatrixFormat<I>& f) {
  o<<'\n'; repeat(i,(f.n)) { repeat(j,f.m) o<<f.p[i][j]<<' '; o<<'\n'; }
  return o;
}
struct LOG_t { ~LOG_t() { cout << endl; } };
#define LOG (LOG_t(),cout<<'L'<<__LINE__<<": ")
#define FMTA(m,w) (MyRangeFormat<decltype(m+0)>(m,m+w))
#define FMTR(b,e) (MyRangeFormat<decltype(e)>(b,e))
#define FMTV(v) FMTR(v.begin(),v.end())
#define FMTM(m,h,w) (MyMatrixFormat<decltype(m+0)>(m,h,w))

#if defined(_WIN32) || defined(_WIN64)
#define getc_x _getc_nolock
#define putc_x _putc_nolock
#elif defined(__GNUC__)
#define getc_x getc_unlocked
#define putc_x putc_unlocked
#else
#define getc_x getc
#define putc_x putc
#endif
class MaiScanner {
  FILE* fp_;
  constexpr bool isvisiblechar(char c) noexcept { return (0x21<=(c)&&(c)<=0x7E); }
public:
  inline MaiScanner(FILE* fp):fp_(fp){}
  template<typename T> void input_integer(T& var) noexcept {
    var = 0; T sign = 1;
    int cc = getc_x(fp_);
    for (; cc < '0' || '9' < cc; cc = getc_x(fp_))
      if (cc == '-') sign = -1;
    for (; '0' <= cc && cc <= '9'; cc = getc_x(fp_))
      var = (var << 3) + (var << 1) + cc - '0';
    var = var * sign;
  }
  inline int c() noexcept { return getc_x(fp_); }
  template<typename T, typename enable_if<is_integral<T>::value, nullptr_t>::type = nullptr>
  inline MaiScanner& operator>>(T& var) noexcept { input_integer<T>(var); return *this; }
  inline MaiScanner& operator>>(string& var) {
    int cc = getc_x(fp_);
    for (; !isvisiblechar(cc); cc = getc_x(fp_));
    for (; isvisiblechar(cc); cc = getc_x(fp_))
      var.push_back(cc);
    return *this;
  }
  template<typename IT> inline void in(IT begin, IT end) { for (auto it = begin; it != end; ++it) *this >> *it; }
};
class MaiPrinter {
  FILE* fp_;
public:
  inline MaiPrinter(FILE* fp):fp_(fp){}
  template<typename T>
  void output_integer(T var) noexcept {
    if (var == 0) { putc_x('0', fp_); return; }
    if (var < 0)
      putc_x('-', fp_),
      var = -var;
    char stack[32]; int stack_p = 0;
    while (var)
      stack[stack_p++] = '0' + (var % 10),
      var /= 10;
    while (stack_p)
      putc_x(stack[--stack_p], fp_);
  }
  inline MaiPrinter& operator<<(char c) noexcept { putc_x(c, fp_); return *this; }
  template<typename T, typename enable_if<is_integral<T>::value, nullptr_t>::type = nullptr>
  inline MaiPrinter& operator<<(T var) noexcept { output_integer<T>(var); return *this; }
  inline MaiPrinter& operator<<(const char* str_p) noexcept { while (*str_p) putc_x(*(str_p++), fp_); return *this; }
  inline MaiPrinter& operator<<(const string& str) {
    const char* p = str.c_str();
    const char* l = p + str.size();
    while (p < l) putc_x(*p++, fp_);
    return *this;
  }
  template<typename IT> void join(IT begin, IT end, char sep = ' ') { for (bool b = 0; begin != end; ++begin, b = 1) b ? *this << sep << *begin : *this << *begin; }
};
MaiScanner scanner(stdin);
MaiPrinter printer(stdout);
// clang-format on

// Edge構造体を定義する無向グラフ
class GraphE {
 public:
  using W_T = int;
  struct Edge {
    int u, v;
    W_T value;
    Edge(int from = 0, int to = 0, W_T value = 0) : u(from), v(to), value(value) {}
    inline int to(int _v) const { return _v == v ? u : v; }
  };
  size_t n;
  vector<vector<int>> vertex_to;
  vector<Edge> edges;

  explicit GraphE(int n = 1) : n(n), vertex_to(n) {}

  inline size_t size() const noexcept { return n; }
  void resize(size_t _n) { vertex_to.resize(n = _n); }
  void connect(int from, int to, W_T val = 0) {
    vertex_to[(size_t)from].push_back((int)edges.size());
    vertex_to[(size_t)to].push_back((int)edges.size());
    edges.emplace_back(from, to, val);
  }
  void connect(vector<Edge>&& es) {
    edges = move(es);
    for (int i = 0; (size_t)i < edges.size(); ++i) {
      vertex_to[edges[i].u].push_back(i);
      vertex_to[edges[i].v].push_back(i);
    }
  }
};

//

int N;

//
GraphE graph;

int dfs(int v, int from) {
  int total = 0;
  for (auto ei : graph.vertex_to[v]) {
    auto e = graph.edges[ei];
    auto to = e.to(v);
    if (to == from) continue;
    total += dfs(to, v) + (to < v);
  }
  return total;
}
int ans[100010];
void dfs1(int v, int from) {
  for (auto ei : graph.vertex_to[v]) {
    auto e = graph.edges[ei];
    auto to = e.to(v);
    if (to == from) continue;
    
    ans[to] = ans[v] + (to > v ? 1 : -1);
    dfs1(to, v);
  }
  return;
}

int main() {
  scanner >> N;
  graph.resize(N);
  repeat(i, N-1) {
    int a, b;
    scanner >> a >> b;
    --a; --b;
    if (a > b) swap(a, b);
    graph.connect(a, b);
  }
  
  ans[0] = dfs(0, -1);
  dfs1(0, -1);
  
  printer.join(ans, ans + N, '\n');
  
  return 0;
}
0