結果

問題 No.1227 I hate ThREE
ユーザー akakimidoriakakimidori
提出日時 2020-09-11 22:38:07
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 41 ms / 2,000 ms
コード長 7,741 bytes
コンパイル時間 14,452 ms
コンパイル使用メモリ 400,996 KB
実行使用メモリ 25,472 KB
最終ジャッジ日時 2025-01-02 05:38:14
合計ジャッジ時間 12,700 ms
ジャッジサーバーID
(参考情報)
judge1 / judge3
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 33
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 #
プレゼンテーションモードにする

// ---------- begin ModInt ----------
mod modint {
#[allow(dead_code)]
pub struct Mod;
impl ConstantModulo for Mod {
const MOD: u32 = 1_000_000_007;
}
#[allow(dead_code)]
pub struct StaticMod;
static mut STATIC_MOD: u32 = 0;
impl Modulo for StaticMod {
fn modulo() -> u32 {
unsafe { STATIC_MOD }
}
}
#[allow(dead_code)]
impl StaticMod {
pub fn set_modulo(p: u32) {
unsafe {
STATIC_MOD = p;
}
}
}
use std::marker::*;
use std::ops::*;
pub trait Modulo {
fn modulo() -> u32;
}
pub trait ConstantModulo {
const MOD: u32;
}
impl<T> Modulo for T
where
T: ConstantModulo,
{
fn modulo() -> u32 {
T::MOD
}
}
pub struct ModInt<T>(pub u32, PhantomData<T>);
impl<T> Clone for ModInt<T> {
fn clone(&self) -> Self {
ModInt::new_unchecked(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();
}
ModInt::new_unchecked(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 = T::modulo() + self.0 - rhs.0;
if d >= T::modulo() {
d -= T::modulo();
}
ModInt::new_unchecked(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 {
let v = self.0 as u64 * rhs.0 as u64 % T::modulo() as u64;
ModInt::new_unchecked(v as u32)
}
}
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::new_unchecked(T::modulo() - self.0)
}
}
}
impl<T> std::fmt::Display for ModInt<T> {
fn fmt<'a>(&self, f: &mut std::fmt::Formatter<'a>) -> std::fmt::Result {
write!(f, "{}", self.0)
}
}
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> {
pub fn new_unchecked(d: u32) -> Self {
ModInt(d, PhantomData)
}
pub fn zero() -> Self {
ModInt::new_unchecked(0)
}
pub fn one() -> Self {
ModInt::new_unchecked(1)
}
pub fn is_zero(&self) -> bool {
self.0 == 0
}
}
#[allow(dead_code)]
impl<T: Modulo> ModInt<T> {
pub fn new(d: u32) -> Self {
ModInt::new_unchecked(d % T::modulo())
}
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.0 != 0);
self.pow(T::modulo() as u64 - 2)
}
}
#[allow(dead_code)]
pub fn mod_pow(r: u64, mut n: u64, m: u64) -> u64 {
let mut t = 1 % m;
let mut s = r % m;
while n > 0 {
if n & 1 == 1 {
t = t * s % m;
}
s = s * s % m;
n >>= 1;
}
t
}
}
// ---------- end ModInt ----------
//https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
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_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_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")
};
}
//
use modint::*;
type M = ModInt<Mod>;
fn run() {
input! {
n: usize,
c: usize,
e: [(usize1, usize1); n - 1],
}
let mut g = vec![vec![]; n];
for (a, b) in e {
g[a].push(b);
g[b].push(a);
}
let mut q = vec![(0, 0)];
for i in 0..n {
let (v, p) = q[i];
let g = &mut g[v];
if let Some(k) = g.iter().position(|u| *u == p) {
g.remove(k);
}
for &u in g.iter() {
q.push((u, v));
}
}
let mut rank = vec![0; n];
for &(v, _) in q.iter().rev() {
for &u in g[v].iter() {
rank[v] = std::cmp::max(rank[v], rank[u] + 1);
}
}
let w = std::cmp::min(c, 6 * rank[0] + 1);
let mut dp = vec![vec![M::one(); w]; n];
for &(v, _) in q.iter().rev() {
for &u in g[v].iter() {
for k in 0..w {
let mut val = M::zero();
if k >= 3 {
val += dp[u][k - 3];
}
if k + 3 < w {
val += dp[u][k + 3];
}
dp[v][k] *= val;
}
}
}
let mut ans = M::zero();
if 6 * rank[0] + 1 < c {
ans += dp[0].iter().take(3 * rank[0]).fold(M::zero(), |s, a| s + *a) * M::new(2);
ans += dp[0][rank[0] * 3] * M::from(c - rank[0] * 6);
} else {
ans += dp[0].iter().fold(M::zero(), |s, a| s + *a);
}
println!("{}", ans);
}
fn main() {
run();
}
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