結果

問題 No.1103 Directed Length Sum
ユーザー maimai
提出日時 2020-07-03 21:43:05
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 812 ms / 3,000 ms
コード長 5,963 bytes
コンパイル時間 3,295 ms
コンパイル使用メモリ 217,356 KB
実行使用メモリ 194,688 KB
最終ジャッジ日時 2024-09-16 23:47:49
合計ジャッジ時間 10,419 ms
ジャッジサーバーID
（参考情報） 		judge1 / 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 3 ms
5,376 KB
testcase_02 AC 281 ms
194,688 KB
testcase_03 AC 146 ms
104,768 KB
testcase_04 AC 423 ms
67,456 KB
testcase_05 AC 812 ms
114,176 KB
testcase_06 AC 257 ms
44,928 KB
testcase_07 AC 41 ms
13,312 KB
testcase_08 AC 68 ms
18,688 KB
testcase_09 AC 22 ms
9,472 KB
testcase_10 AC 112 ms
24,192 KB
testcase_11 AC 473 ms
73,216 KB
testcase_12 AC 251 ms
45,312 KB
testcase_13 AC 105 ms
24,960 KB
testcase_14 AC 17 ms
7,808 KB
testcase_15 AC 193 ms
35,840 KB
testcase_16 AC 538 ms
81,792 KB
testcase_17 AC 570 ms
85,120 KB
testcase_18 AC 97 ms
24,064 KB
testcase_19 AC 483 ms
74,880 KB
testcase_20 AC 27 ms
11,008 KB
testcase_21 AC 54 ms
17,152 KB
testcase_22 AC 382 ms
61,824 KB
testcase_23 AC 197 ms
38,272 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"

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 diterate(cnt,b,e) for(auto cnt=(b);(cnt)!=(e);--(cnt))
const long long MD = 1000000007ll; 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 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<<(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);

class DGraph {
 public:
  int n;
  vector<vector<int>> vertex_to;
  vector<vector<int>> vertex_from;

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

  inline int size() const { return n; }
  void resize(int _n) {
    n = _n;
    vertex_to.resize(_n);
    vertex_from.resize(_n);
  }
  void connect(int from, int to) {
    vertex_to[(int)from].emplace_back(to);
    vertex_from[(int)to].emplace_back(from);
  }
};


//

int N;
DGraph G;

//

int rem[1000010];
ll num[1000010];
ll result[1000010];

void dfs(int v) {
  for (auto to : G.vertex_to[v]) {
    num[to] += num[v] + 1;
    result[to] += result[v] + num[v] + 1;
    result[to] %= MD;
    rem[to] -= 1;
    if (rem[to] == 0) dfs(to);
  }
}

int main() {
  scanner >> N;
  G.resize(N);
  repeat(i, N-1) {
    int a, b; scanner >> a >> b;
    --a; --b;
    G.connect(a, b);
  }
  
  vector<int> starts;
  repeat(i, N) {
    rem[i] = G.vertex_from[i].size();
    if (rem[i] == 0) starts.emplace_back(i);
  }
  
  for (auto v : starts) {
    dfs(v);
  }
  
  ll total = 0;
  repeat(i, N) {
    total += result[i];
    total %= MD;
  }
  
  cout << (total%MD) << endl;
  
  return 0;
}
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