結果
| 問題 |
No.1667 Forest
|
| コンテスト | |
| ユーザー |
keijak
|
| 提出日時 | 2021-09-03 22:52:44 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 719 ms / 3,000 ms |
| コード長 | 3,678 bytes |
| コンパイル時間 | 2,260 ms |
| コンパイル使用メモリ | 205,640 KB |
| 最終ジャッジ日時 | 2025-01-24 06:41:35 |
|
ジャッジサーバーID (参考情報) |
judge4 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 15 |
ソースコード
#include <bits/stdc++.h>
#define REP_(i, a_, b_, a, b, ...) \
for (int i = (a), END_##i = (b); i < END_##i; ++i)
#define REP(i, ...) REP_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__)
#define ALL(x) std::begin(x), std::end(x)
using i64 = long long;
#include <atcoder/modint>
using Mint = atcoder::dynamic_modint<0>;
std::ostream &operator<<(std::ostream &os, const Mint &m) {
return os << m.val();
}
template<typename T, typename U>
inline bool chmax(T &a, U b) {
return a < b and ((a = std::move(b)), true);
}
template<typename T, typename U>
inline bool chmin(T &a, U b) {
return a > b and ((a = std::move(b)), true);
}
template<typename T>
inline int ssize(const T &a) {
return (int) std::size(a);
}
template<typename T>
std::istream &operator>>(std::istream &is, std::vector<T> &a) {
for (auto &x: a) is >> x;
return is;
}
template<typename T, typename U>
std::ostream &operator<<(std::ostream &os, const std::pair<T, U> &a) {
return os << "(" << a.first << ", " << a.second << ")";
}
template<typename Container>
std::ostream &print_seq(const Container &a, std::string_view sep = " ",
std::string_view ends = "\n",
std::ostream &os = std::cout) {
auto b = std::begin(a), e = std::end(a);
for (auto it = std::begin(a); it != e; ++it) {
if (it != b) os << sep;
os << *it;
}
return os << ends;
}
template<typename T, typename = void>
struct is_iterable : std::false_type {};
template<typename T>
struct is_iterable<T, std::void_t<decltype(std::begin(std::declval<T>())),
decltype(std::end(std::declval<T>()))>>
: std::true_type {
};
template<typename T, typename = std::enable_if_t<
is_iterable<T>::value &&
!std::is_same<T, std::string_view>::value &&
!std::is_same<T, std::string>::value>>
std::ostream &operator<<(std::ostream &os, const T &a) {
return print_seq(a, ", ", "", (os << "{")) << "}";
}
void print() { std::cout << "\n"; }
template<class T>
void print(const T &x) {
std::cout << x << "\n";
}
template<typename Head, typename... Tail>
void print(const Head &head, Tail... tail) {
std::cout << head << " ";
print(tail...);
}
struct Input {
template<typename T>
operator T() const {
T x;
std::cin >> x;
return x;
}
} in;
#ifdef MY_DEBUG
#include "debug_dump.hpp"
#else
#define DUMP(...)
#endif
using namespace std;
// mod: prime
template<class T = Mint>
struct Factorials {
// factorials and inverse factorials.
std::vector<T> fact, ifact;
// n: max cached value.
Factorials(int n) : fact(n + 1), ifact(n + 1) {
assert(n >= 0);
assert(n < T::mod());
fact[0] = 1;
for (int i = 1; i <= n; ++i) {
fact[i] = fact[i - 1] * i;
}
ifact[n] = fact[n].inv();
for (int i = n; i >= 1; --i) {
ifact[i - 1] = ifact[i] * i;
}
}
// Combination (nCk)
T C(int n, int k) const {
if (k < 0 || k > n) return 0;
return fact[n] * ifact[k] * ifact[n - k];
}
};
int main() {
ios_base::sync_with_stdio(false), cin.tie(nullptr);
int n = in;
int mod = in;
Mint::set_mod(mod);
Factorials<Mint> fs(n);
auto g = [&](int n) -> Mint {
if (n <= 2) return 1;
return Mint(n).pow(n - 2);
};
vector memo(n + 1, vector(n + 1, optional<Mint>()));
auto f = [&](auto &f, int n, int m) -> Mint {
if (m < 0) return 0;
if (n <= 1) return (m == 0) ? 1 : 0;
if (memo[n][m].has_value()) return memo[n][m].value();
Mint ret = 0;
for (int i = 1; i <= n; ++i) {
ret += fs.C(n - 1, i - 1) * g(i) * f(f, n - i, m - i + 1);
}
memo[n][m] = ret;
return ret;
};
REP(j, n) {
print(f(f, n, j));
}
}
keijak