結果
| 問題 |
No.2846 Birthday Cake
|
| コンテスト | |
| ユーザー |
risujiroh
|
| 提出日時 | 2024-08-23 22:49:48 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 516 ms / 2,000 ms |
| コード長 | 4,708 bytes |
| コンパイル時間 | 4,022 ms |
| コンパイル使用メモリ | 286,312 KB |
| 実行使用メモリ | 8,192 KB |
| 最終ジャッジ日時 | 2024-08-23 22:49:59 |
| 合計ジャッジ時間 | 9,838 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 34 |
ソースコード
#if __INCLUDE_LEVEL__ == 0
#include __BASE_FILE__
template <class Mint>
Mint Go(int K, int n) {
vector<int64_t> L(n + 1, 1);
for (int i : Rep1(1, n)) {
L[i] = lcm(L[i - 1], i);
}
Comb<Mint> comb(n);
vector<map<int64_t, Mint>> f(K + 1);
f[0][0] = comb.fact(K);
for (int i : Rev(Rep1(1, n))) {
for (int k : Rev(Rep(0, K))) {
for (auto [x, y] : f[k]) {
for (int nk : Rep1(k + 1, K)) {
int64_t nx = x + L[n] / i * (nk - k);
if (nx <= L[n] && nx % (L[n] / L[i - 1]) == 0) {
f[nk][nx] += y * comb.recip_fact(nk - k);
}
}
}
}
}
return f[K][L[n]];
}
void Solve() {
int K, n;
IN(K, n);
long long r0 = Go<atcoder::modint998244353>(K, n).val();
long long r1 = Go<atcoder::modint1000000007>(K, n).val();
OUT(atcoder::crt({r0, r1}, {998244353, 1000000007}).first);
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
Solve();
}
#elif __INCLUDE_LEVEL__ == 1
#include <bits/stdc++.h>
#include <atcoder/math>
#include <atcoder/modint>
template <class T>
std::vector<T> make_vector_for_overwrite(int n) {
static_assert(std::is_trivially_destructible_v<T>);
std::vector<T> v;
static_assert(sizeof(v) == 3 * sizeof(T*));
v.reserve(n);
T*(&a)[3] = reinterpret_cast<T*(&)[3]>(v);
assert(a[0] == a[1] && a[1] + n == a[2]);
a[1] = a[2];
return v;
}
template <class T>
class Comb {
public:
Comb() = default;
explicit Comb(int max_n)
: fact_(make_vector_for_overwrite<T>(max_n + 1)),
recip_fact_(make_vector_for_overwrite<T>(max_n + 1)) {
fact_[0] = 1;
for (const int n : std::views::iota(1, max_n + 1)) {
fact_[n] = fact_[n - 1] * n;
}
recip_fact_[max_n] = 1 / fact_[max_n];
for (const int n : std::views::iota(1, max_n + 1) | std::views::reverse) {
recip_fact_[n - 1] = n * recip_fact_[n];
}
}
T recip(int n) const {
assert(n);
return n < 0 ? -recip(-n) : recip_fact_[n] * fact_[n - 1];
}
T fact(int n) const {
assert(0 <= n);
return fact_[n];
}
T recip_fact(int n) const { return n < 0 ? 0 : recip_fact_[n]; }
T falling_fact(int n, int k) const {
assert(0 <= n || n < k);
if (n < 0) {
const T t = falling_fact(k - n - 1, k);
return k & 1 ? -t : t;
}
return n < k ? 0 : recip_fact(n - k) * fact(n);
}
T recip_falling_fact(int n, int k) const {
assert(n < 0 || k <= n);
return falling_fact(n - k, -k);
}
T rising_fact(int n, int k) const {
assert(n <= 0 || 0 < n + k);
return falling_fact(n + k - 1, k);
}
T recip_rising_fact(int n, int k) const {
assert(0 < n || n + k <= 0);
return falling_fact(n - 1, -k);
}
T binom(int n, int k) const {
if ((n < 0) ^ (k < 0) ^ (n < k)) {
return 0;
}
if (n < 0 && k < 0) {
k = n - k;
}
return recip_fact(k) * falling_fact(n, k);
}
T recip_binom(int n, int k) const {
assert((0 <= n) ^ (0 <= k) ^ (k <= n));
k = std::max(k, n - k);
return recip_falling_fact(n, k) * fact(k);
}
T multiset(int n, int k) const { return binom(n + k - 1, k); }
T recip_multiset(int n, int k) const {
assert((0 < n) ^ (0 <= k) ^ (0 < n + k));
return recip_binom(n + k - 1, k);
}
private:
std::vector<T> fact_;
std::vector<T> recip_fact_;
};
template <class T> concept Range = std::ranges::range<T> && !std::convertible_to<T, std::string_view>;
template <class T> concept Tuple = std::__is_tuple_like<T>::value && !Range<T>;
namespace std {
istream& operator>>(istream& is, Range auto&& r) {
for (auto&& e : r) is >> e;
return is;
}
istream& operator>>(istream& is, Tuple auto&& t) {
apply([&](auto&... xs) { (is >> ... >> xs); }, t);
return is;
}
ostream& operator<<(ostream& os, Range auto&& r) {
auto sep = "";
for (auto&& e : r) os << exchange(sep, " ") << e;
return os;
}
ostream& operator<<(ostream& os, Tuple auto&& t) {
auto sep = "";
apply([&](auto&... xs) { ((os << exchange(sep, " ") << xs), ...); }, t);
return os;
}
template <class T, atcoder::internal::is_modint_t<T>* = nullptr>
istream& operator>>(istream& is, T& x) {
int v;
is >> v;
x = T::raw(v);
return is;
}
template <class T, atcoder::internal::is_modint_t<T>* = nullptr>
ostream& operator<<(ostream& os, const T& x) {
return os << x.val();
}
} // namespace std
using namespace std;
#define Rev views::reverse
#define Rep(...) [](int l, int r) { return views::iota(min(l, r), r); }(__VA_ARGS__)
#define Rep1(...) [](int l, int r) { return Rep(l, r + 1); }(__VA_ARGS__)
#define IN(...) cin >> forward_as_tuple(__VA_ARGS__)
#define OUT(...) cout << forward_as_tuple(__VA_ARGS__) << '\n'
#endif // __INCLUDE_LEVEL__ == 1
risujiroh