結果
| 問題 |
No.1302 Random Tree Score
|
| コンテスト | |
| ユーザー |
minato
|
| 提出日時 | 2020-11-27 23:23:34 |
| 言語 | C++17(gcc12) (gcc 12.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 517 ms / 3,000 ms |
| コード長 | 4,234 bytes |
| コンパイル時間 | 27,376 ms |
| コンパイル使用メモリ | 357,540 KB |
| 最終ジャッジ日時 | 2025-01-16 08:33:35 |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 14 |
ソースコード
#ifdef ONLINE_JUDGE
#pragma GCC target("avx2,avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#endif
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using i128 = __int128_t;
using pii = pair<int, int>;
using pll = pair<long long, long long>;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define rrep(i, n) for (int i = int(n) - 1; i >= 0; i--)
#define all(x) (x).begin(), (x).end()
constexpr char ln = '\n';
istream& operator>>(istream& is, __int128_t& x) {
x = 0;
string s;
is >> s;
int n = int(s.size()), it = 0;
if (s[0] == '-') it++;
for (; it < n; it++) x = (x * 10 + s[it] - '0');
if (s[0] == '-') x = -x;
return is;
}
ostream& operator<<(ostream& os, __int128_t x) {
if (x == 0) return os << 0;
if (x < 0) os << '-', x = -x;
deque<int> deq;
while (x) deq.emplace_front(x % 10), x /= 10;
for (int e : deq) os << e;
return os;
}
template<class T1, class T2>
ostream& operator<<(ostream& os, const pair<T1, T2>& p) {
return os << "(" << p.first << ", " << p.second << ")";
}
template<class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
os << "{";
for (int i = 0; i < int(v.size()); i++) {
if (i) os << ", ";
os << v[i];
}
return os << "}";
}
template<class Container> inline int SZ(Container& v) { return int(v.size()); }
template<class T> inline void UNIQUE(vector<T>& v) { v.erase(unique(v.begin(), v.end()), v.end()); }
template<class T1, class T2> inline bool chmax(T1& a, T2 b) { if (a < b) {a = b; return true ;} return false ;}
template<class T1, class T2> inline bool chmin(T1& a, T2 b) { if (a > b) {a = b; return true ;} return false ;}
inline int topbit(ull x) { return x == 0 ? -1 : 63 - __builtin_clzll(x); }
inline int botbit(ull x) { return x == 0 ? 64 : __builtin_ctzll(x); }
inline int popcount(ull x) { return __builtin_popcountll(x); }
inline int kthbit(ull x, int k) { return (x>>k) & 1; }
inline constexpr long long TEN(int x) { return x == 0 ? 1 : TEN(x-1) * 10; }
inline void print() { cout << "\n"; }
template<class T>
inline void print(const vector<T>& v) {
for (int i = 0; i < int(v.size()); i++) {
if (i) cout << " ";
cout << v[i];
}
print();
}
template<class T, class... Args>
inline void print(const T& x, const Args& ... args) {
cout << x << " ";
print(args...);
}
#ifdef MINATO_LOCAL
inline void debug_out() { cerr << endl; }
template <class T, class... Args>
inline void debug_out(const T& x, const Args& ... args) {
cerr << " " << x;
debug_out(args...);
}
#define debug(...) cerr << __LINE__ << " : [" << #__VA_ARGS__ << "] =", debug_out(__VA_ARGS__)
#define dump(x) cerr << __LINE__ << " : " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif
struct fast_ios { fast_ios() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
//using mint = modint1000000007;
//using mint = modint;
struct ModCombination {
vector<mint> Fac,Facinv;
ModCombination(int x) {
Fac.resize(x+1);
Facinv.resize(x+1);
Fac[0] = 1;
for (int i = 0; i < x; ++i) Fac[i+1] = Fac[i]*(i+1);
Facinv[x] = Fac[0]/Fac[x];
for (int i = x; i > 0; --i) Facinv[i-1] = Facinv[i]*i;
}
mint get(int n, int k) {
if (k < 0 || k > n) return 0;
return Fac[n]*Facinv[k]*Facinv[n-k];
}
};
int main() {
ModCombination MC(1000000);
int N; cin >> N;
vector<mint> p(N-1,1);
for (int i = 0; i < N-1; i++) p[i] = MC.Facinv[i]*(i+1);
int K = N;
auto b = p;
vector<mint> e(N-1);
e[0] = 1;
while (K) {
if (K&1) {
e = convolution(e,b);
e.resize(N-1);
}
K >>= 1;
b = convolution(b,b);
b.resize(N-1);
}
//rep(i,N) debug(e[i].val());
e[N-2] *= MC.Fac[N-2];
mint q = mint(N).pow(N-2);
cout << (e[N-2]/q).val() << ln;
}
minato