結果
| 問題 | No.2243 Coaching Schedule |
| ユーザー |
 akakimidori
|
| 提出日時 | 2023-03-10 21:31:37 |
| 言語 | Rust (1.77.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 454 ms / 4,000 ms |
| コード長 | 23,696 bytes |
| コンパイル時間 | 16,257 ms |
| コンパイル使用メモリ | 390,304 KB |
| 実行使用メモリ | 8,972 KB |
| 最終ジャッジ日時 | 2024-09-18 03:43:48 |
| 合計ジャッジ時間 | 19,521 ms |
|
ジャッジサーバーID （参考情報） |
judge5 / judge1 |
（要ログイン）
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 | 1 ms
6,812 KB |
| testcase_01 | AC | 1 ms
6,816 KB |
| testcase_02 | AC | 1 ms
6,944 KB |
| testcase_03 | AC | 1 ms
6,940 KB |
| testcase_04 | AC | 3 ms
6,940 KB |
| testcase_05 | AC | 64 ms
8,972 KB |
| testcase_06 | AC | 96 ms
8,840 KB |
| testcase_07 | AC | 95 ms
8,836 KB |
| testcase_08 | AC | 95 ms
8,772 KB |
| testcase_09 | AC | 124 ms
8,216 KB |
| testcase_10 | AC | 125 ms
8,220 KB |
| testcase_11 | AC | 124 ms
8,348 KB |
| testcase_12 | AC | 454 ms
7,888 KB |
| testcase_13 | AC | 354 ms
8,640 KB |
| testcase_14 | AC | 354 ms
8,776 KB |
| testcase_15 | AC | 352 ms
8,756 KB |
| testcase_16 | AC | 52 ms
8,172 KB |
| testcase_17 | AC | 25 ms
6,944 KB |
| testcase_18 | AC | 76 ms
7,928 KB |
| testcase_19 | AC | 110 ms
7,056 KB |
| testcase_20 | AC | 82 ms
6,940 KB |
| testcase_21 | AC | 43 ms
6,940 KB |
| testcase_22 | AC | 39 ms
6,940 KB |
| testcase_23 | AC | 7 ms
6,940 KB |
| testcase_24 | AC | 55 ms
6,944 KB |
| testcase_25 | AC | 10 ms
6,940 KB |
| testcase_26 | AC | 21 ms
6,940 KB |
| testcase_27 | AC | 58 ms
6,940 KB |
| testcase_28 | AC | 10 ms
6,940 KB |
| testcase_29 | AC | 88 ms
6,944 KB |
| testcase_30 | AC | 88 ms
8,180 KB |
| testcase_31 | AC | 90 ms
8,576 KB |
| testcase_32 | AC | 38 ms
6,940 KB |
| testcase_33 | AC | 22 ms
6,944 KB |
| testcase_34 | AC | 77 ms
7,236 KB |
| testcase_35 | AC | 91 ms
7,068 KB |
| testcase_36 | AC | 84 ms
8,420 KB |
コンパイルメッセージ
warning: unused import: `std::io::Write` --> src/main.rs:1:5 | 1 | use std::io::Write; | ^^^^^^^^^^^^^^ | = note: `#[warn(unused_imports)]` on by default warning: variable does not need to be mutable --> src/main.rs:38:9 | 38 | let mut dp = memo.multiply(&f.inverse(n + 1)); | ----^^ | | | help: remove this `mut` | = note: `#[warn(unused_mut)]` on by default warning: type alias `Set` is never used --> src/main.rs:5:6 | 5 | type Set<T> = BTreeSet<T>; | ^^^ | = note: `#[warn(dead_code)]` on by default warning: type alias `Deque` is never used --> src/main.rs:6:6 | 6 | type Deque<T> = VecDeque<T>; | ^^^^^
ソースコード
use std::io::Write;
use std::collections::*;
type Map<K, V> = BTreeMap<K, V>;
type Set<T> = BTreeSet<T>;
type Deque<T> = VecDeque<T>;
fn main() {
input! {
m: usize,
n: usize,
a: [usize1; n],
}
let mut c = vec![0; m];
for a in a {
c[a] += 1;
}
c.retain(|p| *p > 0);
let s = *c.iter().max().unwrap();
let mut map = Map::new();
for c in c.iter() {
*map.entry(*c).or_insert(0) += 1;
}
let pc = precalc::Precalc::new(n + m);
let mut memo = vec![M::zero(); n + 1];
for i in s..=n {
let mut v = M::one();
for (&c, &k) in map.iter() {
let r = pc.fact(i) * pc.ifact(i - c);
v *= r.pow(k as u64);
}
memo[i] = v * pc.ifact(i);
}
let mut f = vec![M::zero(); n + 1];
for i in 0..=n {
f[i] = pc.ifact(i);
}
let mut dp = memo.multiply(&f.inverse(n + 1));
let mut ans = M::zero();
for (i, dp) in dp.iter().enumerate().take(n + 1) {
ans += pc.fact(i) * *dp;
}
println!("{}", ans);
}
// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[macro_export]
macro_rules! input {
(source = $s:expr, $($r:tt)*) => {
let mut iter = $s.split_whitespace();
input_inner!{iter, $($r)*}
};
($($r:tt)*) => {
let s = {
use std::io::Read;
let mut s = String::new();
std::io::stdin().read_to_string(&mut s).unwrap();
s
};
let mut iter = s.split_whitespace();
input_inner!{iter, $($r)*}
};
}
#[macro_export]
macro_rules! input_inner {
($iter:expr) => {};
($iter:expr, ) => {};
($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
let $var = read_value!($iter, $t);
input_inner!{$iter $($r)*}
};
}
#[macro_export]
macro_rules! read_value {
($iter:expr, ( $($t:tt),* )) => {
( $(read_value!($iter, $t)),* )
};
($iter:expr, [ $t:tt ; $len:expr ]) => {
(0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
};
($iter:expr, chars) => {
read_value!($iter, String).chars().collect::<Vec<char>>()
};
($iter:expr, bytes) => {
read_value!($iter, String).bytes().collect::<Vec<u8>>()
};
($iter:expr, usize1) => {
read_value!($iter, usize) - 1
};
($iter:expr, $t:ty) => {
$iter.next().unwrap().parse::<$t>().expect("Parse error")
};
}
// ---------- end input macro ----------
// ---------- begin ModInt ----------
// モンゴメリ乗算を用いる
// ほぼCodeforces用
// 注意
// new_unchecked は値xが 0 <= x < modulo であることを仮定
// ModInt の中身は正規化された値で持ってるので直接読んだり書いたりするとぶっ壊れる
// 奇素数のみ
mod modint {
use std::marker::*;
use std::ops::*;
pub trait Modulo {
fn modulo() -> u32;
fn rem() -> u32;
fn ini() -> u64;
fn reduce(x: u64) -> u32 {
debug_assert!(x < (Self::modulo() as u64) << 32);
let b = (x as u32 * Self::rem()) as u64;
let t = x + b * Self::modulo() as u64;
let mut c = (t >> 32) as u32;
if c >= Self::modulo() {
c -= Self::modulo();
}
c as u32
}
}
#[allow(dead_code)]
pub enum Mod1_000_000_007 {}
impl Modulo for Mod1_000_000_007 {
fn modulo() -> u32 {
1_000_000_007
}
fn rem() -> u32 {
2226617417
}
fn ini() -> u64 {
582344008
}
}
#[allow(dead_code)]
pub enum Mod998_244_353 {}
impl Modulo for Mod998_244_353 {
fn modulo() -> u32 {
998_244_353
}
fn rem() -> u32 {
998244351
}
fn ini() -> u64 {
932051910
}
}
#[allow(dead_code)]
pub fn generate_umekomi_modulo(p: u32) {
assert!(
p < (1 << 31)
&& p > 2
&& p & 1 == 1
&& (2u32..).take_while(|v| v * v <= p).all(|k| p % k != 0)
);
let mut t = 1u32;
let mut s = !p + 1;
let mut n = !0u32 >> 2;
while n > 0 {
if n & 1 == 1 {
t *= s;
}
s *= s;
n >>= 1;
}
let mut ini = (1u64 << 32) % p as u64;
ini = (ini << 32) % p as u64;
assert!(t * p == !0);
println!("pub enum Mod{} {{}}", p);
println!("impl Modulo for Mod{} {{", p);
println!(" fn modulo() -> u32 {{");
println!(" {}", p);
println!(" }}");
println!(" fn rem() -> u32 {{");
println!(" {}", t);
println!(" }}");
println!(" fn ini() -> u64 {{");
println!(" {}", ini);
println!(" }}");
println!("}}");
let mut f = vec![];
let mut n = p - 1;
for i in 2.. {
if i * i > n {
break;
}
if n % i == 0 {
f.push(i);
while n % i == 0 {
n /= i;
}
}
}
if n > 1 {
f.push(n);
}
let mut order = 1;
let mut n = p - 1;
while n % 2 == 0 {
n /= 2;
order <<= 1;
}
let z = (2u64..)
.find(|z| {
f.iter()
.all(|f| mod_pow(*z, ((p - 1) / *f) as u64, p as u64) != 1)
})
.unwrap();
let zeta = mod_pow(z, ((p - 1) / order) as u64, p as u64);
println!("impl transform::NTTFriendly for Mod{} {{", p);
println!(" fn order() -> usize {{");
println!(" {}", order);
println!(" }}");
println!(" fn zeta() -> u32 {{");
println!(" {}", zeta);
println!(" }}");
println!("}}");
}
pub struct ModInt<T>(u32, PhantomData<T>);
impl<T> Clone for ModInt<T> {
fn clone(&self) -> Self {
ModInt::build(self.0)
}
}
impl<T> Copy for ModInt<T> {}
impl<T: Modulo> Add for ModInt<T> {
type Output = ModInt<T>;
fn add(self, rhs: Self) -> Self::Output {
let mut d = self.0 + rhs.0;
if d >= T::modulo() {
d -= T::modulo();
}
Self::build(d)
}
}
impl<T: Modulo> AddAssign for ModInt<T> {
fn add_assign(&mut self, rhs: Self) {
*self = *self + rhs;
}
}
impl<T: Modulo> Sub for ModInt<T> {
type Output = ModInt<T>;
fn sub(self, rhs: Self) -> Self::Output {
let mut d = self.0 - rhs.0;
if self.0 < rhs.0 {
d += T::modulo();
}
Self::build(d)
}
}
impl<T: Modulo> SubAssign for ModInt<T> {
fn sub_assign(&mut self, rhs: Self) {
*self = *self - rhs;
}
}
impl<T: Modulo> Mul for ModInt<T> {
type Output = ModInt<T>;
fn mul(self, rhs: Self) -> Self::Output {
Self::build(T::reduce(self.0 as u64 * rhs.0 as u64))
}
}
impl<T: Modulo> MulAssign for ModInt<T> {
fn mul_assign(&mut self, rhs: Self) {
*self = *self * rhs;
}
}
impl<T: Modulo> Neg for ModInt<T> {
type Output = ModInt<T>;
fn neg(self) -> Self::Output {
if self.0 == 0 {
Self::zero()
} else {
Self::build(T::modulo() - self.0)
}
}
}
impl<T: Modulo> std::fmt::Display for ModInt<T> {
fn fmt<'a>(&self, f: &mut std::fmt::Formatter<'a>) -> std::fmt::Result {
write!(f, "{}", self.get())
}
}
impl<T: Modulo> std::fmt::Debug for ModInt<T> {
fn fmt<'a>(&self, f: &mut std::fmt::Formatter<'a>) -> std::fmt::Result {
write!(f, "{}", self.get())
}
}
impl<T: Modulo> std::str::FromStr for ModInt<T> {
type Err = std::num::ParseIntError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let val = s.parse::<u32>()?;
Ok(ModInt::new(val))
}
}
impl<T: Modulo> From<usize> for ModInt<T> {
fn from(val: usize) -> ModInt<T> {
ModInt::new_unchecked((val % T::modulo() as usize) as u32)
}
}
impl<T: Modulo> From<u64> for ModInt<T> {
fn from(val: u64) -> ModInt<T> {
ModInt::new_unchecked((val % T::modulo() as u64) as u32)
}
}
impl<T: Modulo> From<i64> for ModInt<T> {
fn from(val: i64) -> ModInt<T> {
let m = T::modulo() as i64;
ModInt::new((val % m + m) as u32)
}
}
#[allow(dead_code)]
impl<T> ModInt<T> {
fn build(d: u32) -> Self {
ModInt(d, PhantomData)
}
pub fn zero() -> Self {
Self::build(0)
}
pub fn is_zero(&self) -> bool {
self.0 == 0
}
}
#[allow(dead_code)]
impl<T: Modulo> ModInt<T> {
pub fn new_unchecked(d: u32) -> Self {
Self::build(T::reduce(d as u64 * T::ini()))
}
pub fn new(d: u32) -> Self {
Self::new_unchecked(d % T::modulo())
}
pub fn one() -> Self {
Self::new_unchecked(1)
}
pub fn get(&self) -> u32 {
T::reduce(self.0 as u64)
}
pub fn pow(&self, mut n: u64) -> Self {
let mut t = Self::one();
let mut s = *self;
while n > 0 {
if n & 1 == 1 {
t *= s;
}
s *= s;
n >>= 1;
}
t
}
pub fn inv(&self) -> Self {
assert!(!self.is_zero());
self.pow((T::modulo() - 2) as u64)
}
}
pub fn mod_pow(mut r: u64, mut n: u64, m: u64) -> u64 {
let mut t = 1 % m;
while n > 0 {
if n & 1 == 1 {
t = t * r % m;
}
r = r * r % m;
n >>= 1;
}
t
}
}
// ---------- end ModInt ----------
// ---------- begin Precalc ----------
mod precalc {
use super::modint::*;
#[allow(dead_code)]
pub struct Precalc<T> {
inv: Vec<ModInt<T>>,
fact: Vec<ModInt<T>>,
ifact: Vec<ModInt<T>>,
}
#[allow(dead_code)]
impl<T: Modulo> Precalc<T> {
pub fn new(n: usize) -> Precalc<T> {
let mut inv = vec![ModInt::one(); n + 1];
let mut fact = vec![ModInt::one(); n + 1];
let mut ifact = vec![ModInt::one(); n + 1];
for i in 2..(n + 1) {
fact[i] = fact[i - 1] * ModInt::new_unchecked(i as u32);
}
ifact[n] = fact[n].inv();
if n > 0 {
inv[n] = ifact[n] * fact[n - 1];
}
for i in (1..n).rev() {
ifact[i] = ifact[i + 1] * ModInt::new_unchecked((i + 1) as u32);
inv[i] = ifact[i] * fact[i - 1];
}
Precalc {
inv: inv,
fact: fact,
ifact: ifact,
}
}
pub fn inv(&self, n: usize) -> ModInt<T> {
assert!(n > 0);
self.inv[n]
}
pub fn fact(&self, n: usize) -> ModInt<T> {
self.fact[n]
}
pub fn ifact(&self, n: usize) -> ModInt<T> {
self.ifact[n]
}
pub fn perm(&self, n: usize, k: usize) -> ModInt<T> {
if k > n {
return ModInt::zero();
}
self.fact[n] * self.ifact[n - k]
}
pub fn comb(&self, n: usize, k: usize) -> ModInt<T> {
if k > n {
return ModInt::zero();
}
self.fact[n] * self.ifact[k] * self.ifact[n - k]
}
}
}
// ---------- end Precalc ----------
use modint::*;
pub trait NTTFriendly: modint::Modulo {
fn order() -> usize;
fn zeta() -> u32;
}
type M = ModInt<Mod998_244_353>;
impl NTTFriendly for Mod998_244_353 {
fn order() -> usize {
8388608
}
fn zeta() -> u32 {
15311432
}
}
// 列に対する命令をテキトーに詰めあわせ
// modint, primitive type の２つあたりで使うことを想定
// +, -, *
// zero を要求してないのに仮定してる場所がある
//
// 何も考えずに書き始めたらいろいろよくわからないことになった
// 整理
// 長さが等しいときの加算、減算、dot積はok
// 長さが異なるときはどうする？
// 0埋めされてるというイメージなので
// 加算、減算は素直だがdot積はイマイチ
// dot積だけ長さが等しいとしておく?
// あるいは0埋めのイメージを消すか
use std::ops::*;
pub trait Zero: Sized + Add<Output = Self> {
fn zero() -> Self;
}
pub fn zero<T: Zero>() -> T {
T::zero()
}
impl<T: Modulo> Zero for ModInt<T> {
fn zero() -> Self {
Self::zero()
}
}
impl Zero for usize {
fn zero() -> Self {
0
}
}
pub trait ArrayAdd {
type Item;
fn add(&self, rhs: &[Self::Item]) -> Vec<Self::Item>;
}
impl<T> ArrayAdd for [T]
where
T: Zero + Copy,
{
type Item = T;
fn add(&self, rhs: &[Self::Item]) -> Vec<Self::Item> {
let mut c = vec![T::zero(); self.len().max(rhs.len())];
c[..self.len()].copy_from_slice(self);
c.add_assign(rhs);
c
}
}
pub trait ArrayAddAssign {
type Item;
fn add_assign(&mut self, rhs: &[Self::Item]);
}
impl<T> ArrayAddAssign for [T]
where
T: Add<Output = T> + Copy,
{
type Item = T;
fn add_assign(&mut self, rhs: &[Self::Item]) {
assert!(self.len() >= rhs.len());
self.iter_mut().zip(rhs).for_each(|(x, a)| *x = *x + *a);
}
}
impl<T> ArrayAddAssign for Vec<T>
where
T: Zero + Add<Output = T> + Copy,
{
type Item = T;
fn add_assign(&mut self, rhs: &[Self::Item]) {
if self.len() < rhs.len() {
self.resize(rhs.len(), T::zero());
}
self.as_mut_slice().add_assign(rhs);
}
}
pub trait ArraySub {
type Item;
fn sub(&self, rhs: &[Self::Item]) -> Vec<Self::Item>;
}
impl<T> ArraySub for [T]
where
T: Zero + Sub<Output = T> + Copy,
{
type Item = T;
fn sub(&self, rhs: &[Self::Item]) -> Vec<Self::Item> {
let mut c = vec![T::zero(); self.len().max(rhs.len())];
c[..self.len()].copy_from_slice(self);
c.sub_assign(rhs);
c
}
}
pub trait ArraySubAssign {
type Item;
fn sub_assign(&mut self, rhs: &[Self::Item]);
}
impl<T> ArraySubAssign for [T]
where
T: Sub<Output = T> + Copy,
{
type Item = T;
fn sub_assign(&mut self, rhs: &[Self::Item]) {
assert!(self.len() >= rhs.len());
self.iter_mut().zip(rhs).for_each(|(x, a)| *x = *x - *a);
}
}
impl<T> ArraySubAssign for Vec<T>
where
T: Zero + Sub<Output = T> + Copy,
{
type Item = T;
fn sub_assign(&mut self, rhs: &[Self::Item]) {
if self.len() < rhs.len() {
self.resize(rhs.len(), T::zero());
}
self.as_mut_slice().sub_assign(rhs);
}
}
pub trait ArrayDot {
type Item;
fn dot(&self, rhs: &[Self::Item]) -> Vec<Self::Item>;
}
impl<T> ArrayDot for [T]
where
T: Mul<Output = T> + Copy,
{
type Item = T;
fn dot(&self, rhs: &[Self::Item]) -> Vec<Self::Item> {
assert!(self.len() == rhs.len());
self.iter().zip(rhs).map(|p| *p.0 * *p.1).collect()
}
}
pub trait ArrayDotAssign {
type Item;
fn dot_assign(&mut self, rhs: &[Self::Item]);
}
impl<T> ArrayDotAssign for [T]
where
T: MulAssign + Copy,
{
type Item = T;
fn dot_assign(&mut self, rhs: &[Self::Item]) {
assert!(self.len() == rhs.len());
self.iter_mut().zip(rhs).for_each(|(x, a)| *x *= *a);
}
}
pub trait ArrayMul {
type Item;
fn mul(&self, rhs: &[Self::Item]) -> Vec<Self::Item>;
}
impl<T> ArrayMul for [T]
where
T: Zero + Mul<Output = T> + Copy,
{
type Item = T;
fn mul(&self, rhs: &[Self::Item]) -> Vec<Self::Item> {
if self.is_empty() || rhs.is_empty() {
return vec![];
}
let mut res = vec![zero(); self.len() + rhs.len() - 1];
for (i, a) in self.iter().enumerate() {
for (c, b) in res[i..].iter_mut().zip(rhs) {
*c = *c + *a * *b;
}
}
res
}
}
pub trait ArrayNTT {
type Item;
fn ntt(&mut self);
fn intt(&mut self);
fn multiply(&self, rhs: &[Self::Item]) -> Vec<Self::Item>;
}
impl<T> ArrayNTT for [ModInt<T>]
where
T: NTTFriendly,
{
type Item = ModInt<T>;
fn ntt(&mut self) {
let f = self;
let n = f.len();
assert!(n.count_ones() == 1);
assert!(n <= T::order());
let len = n.trailing_zeros() as usize;
let mut es = [ModInt::zero(); 30];
let mut ies = [ModInt::zero(); 30];
let mut sum_e = [ModInt::zero(); 30];
let cnt2 = T::order().trailing_zeros() as usize;
let mut e = ModInt::new_unchecked(T::zeta());
let mut ie = e.inv();
for i in (2..=cnt2).rev() {
es[i - 2] = e;
ies[i - 2] = ie;
e = e * e;
ie = ie * ie;
}
let mut now = ModInt::one();
for i in 0..(cnt2 - 1) {
sum_e[i] = es[i] * now;
now *= ies[i];
}
for ph in 1..=len {
let p = 1 << (len - ph);
let mut now = ModInt::one();
for (i, f) in f.chunks_exact_mut(2 * p).enumerate() {
let (x, y) = f.split_at_mut(p);
for (x, y) in x.iter_mut().zip(y.iter_mut()) {
let l = *x;
let r = *y * now;
*x = l + r;
*y = l - r;
}
now *= sum_e[(!i).trailing_zeros() as usize];
}
}
}
fn intt(&mut self) {
let f = self;
let n = f.len();
assert!(n.count_ones() == 1);
assert!(n <= T::order());
let len = n.trailing_zeros() as usize;
let mut es = [ModInt::zero(); 30];
let mut ies = [ModInt::zero(); 30];
let mut sum_ie = [ModInt::zero(); 30];
let cnt2 = T::order().trailing_zeros() as usize;
let mut e = ModInt::new_unchecked(T::zeta());
let mut ie = e.inv();
for i in (2..=cnt2).rev() {
es[i - 2] = e;
ies[i - 2] = ie;
e = e * e;
ie = ie * ie;
}
let mut now = ModInt::one();
for i in 0..(cnt2 - 1) {
sum_ie[i] = ies[i] * now;
now *= es[i];
}
for ph in (1..=len).rev() {
let p = 1 << (len - ph);
let mut inow = ModInt::one();
for (i, f) in f.chunks_exact_mut(2 * p).enumerate() {
let (x, y) = f.split_at_mut(p);
for (x, y) in x.iter_mut().zip(y.iter_mut()) {
let l = *x;
let r = *y;
*x = l + r;
*y = (l - r) * inow;
}
inow *= sum_ie[(!i).trailing_zeros() as usize];
}
}
let ik = ModInt::new_unchecked((T::modulo() + 1) >> 1).pow(len as u64);
for f in f.iter_mut() {
*f *= ik;
}
}
fn multiply(&self, rhs: &[Self::Item]) -> Vec<Self::Item> {
if self.len().min(rhs.len()) <= 32 {
return self.mul(rhs);
}
let size = (self.len() + rhs.len() - 1).next_power_of_two();
let mut f = vec![ModInt::zero(); size];
let mut g = vec![ModInt::zero(); size];
f[..self.len()].copy_from_slice(self);
g[..rhs.len()].copy_from_slice(rhs);
f.ntt();
g.ntt();
f.dot_assign(&g);
f.intt();
f.truncate(self.len() + rhs.len() - 1);
f
}
}
pub trait PolynomialOperation {
type Item;
fn eval(&self, x: Self::Item) -> Self::Item;
fn derivative(&self) -> Vec<Self::Item>;
fn integral(&self) -> Vec<Self::Item>;
}
impl<T: Modulo> PolynomialOperation for [ModInt<T>] {
type Item = ModInt<T>;
fn eval(&self, x: Self::Item) -> Self::Item {
self.iter().rev().fold(ModInt::zero(), |s, a| s * x + *a)
}
fn derivative(&self) -> Vec<Self::Item> {
if self.len() <= 1 {
return vec![];
}
self[1..]
.iter()
.enumerate()
.map(|(k, a)| ModInt::new_unchecked(k as u32 + 1) * *a)
.collect()
}
fn integral(&self) -> Vec<Self::Item> {
if self.is_empty() {
return vec![];
}
let mut inv = vec![ModInt::one(); self.len() + 1];
let mut mul = ModInt::zero();
for i in 1..=self.len() {
mul += ModInt::one();
inv[i] = inv[i - 1] * mul;
}
let mut prod = inv[self.len()].inv();
for i in (1..=self.len()).rev() {
inv[i] = self[i - 1] * inv[i - 1] * prod;
prod *= mul;
mul -= ModInt::one();
}
inv[0] = ModInt::zero();
inv
}
}
pub trait FPSOperation {
type Item;
fn inverse(&self, n: usize) -> Vec<Self::Item>;
fn log(&self, n: usize) -> Vec<Self::Item>;
fn exp(&self, n: usize) -> Vec<Self::Item>;
}
impl<T: NTTFriendly> FPSOperation for [ModInt<T>] {
type Item = ModInt<T>;
fn inverse(&self, n: usize) -> Vec<Self::Item> {
assert!(self.len() > 0 && !self[0].is_zero());
let len = n.next_power_of_two();
assert!(2 * len <= T::order());
let mut b = vec![ModInt::zero(); n];
b[0] = self[0].inv();
let mut f = Vec::with_capacity(2 * len);
let mut g = Vec::with_capacity(2 * len);
let mut size = 1;
while size < n {
g.clear();
g.extend(b.iter().take(size));
g.resize(2 * size, ModInt::zero());
f.clear();
f.extend(self.iter().take(2 * size));
f.resize(2 * size, ModInt::zero());
f.ntt();
g.ntt();
f.dot_assign(&g);
f.intt();
f[..size].iter_mut().for_each(|f| *f = ModInt::zero());
f.ntt();
f.dot_assign(&g);
f.intt();
for (b, g) in b[size..].iter_mut().zip(&f[size..]) {
*b = *b - *g;
}
size *= 2;
}
b
}
fn log(&self, n: usize) -> Vec<Self::Item> {
assert!(self.get(0).map_or(false, |p| p.get() == 1));
let mut b = self.derivative().multiply(&self.inverse(n));
b.truncate(n - 1);
let mut b = b.integral();
b.resize(n, ModInt::zero());
b
}
fn exp(&self, n: usize) -> Vec<Self::Item> {
assert!(self.get(0).map_or(true, |a| a.is_zero()));
assert!(n <= T::order());
let mut b = vec![ModInt::one()];
let mut size = 1;
while size < n {
size <<= 1;
let f = b.log(size);
let g = self[..self.len().min(size)].sub(&f);
b = b.multiply(&g).add(&b);
b.truncate(size);
}
b.truncate(n);
b.resize(n, ModInt::zero());
b
}
}
// test
// yuki907: https://yukicoder.me/submissions/712523
// hhkb2020: https://atcoder.jp/contests/hhkb2020/submissions/26997806
//