結果
問題 | No.1879 How many matchings? |
ユーザー | akakimidori |
提出日時 | 2022-03-18 22:08:22 |
言語 | Rust (1.77.0 + proconio) |
結果 |
WA
|
実行時間 | - |
コード長 | 4,640 bytes |
コンパイル時間 | 10,814 ms |
コンパイル使用メモリ | 405,176 KB |
実行使用メモリ | 6,824 KB |
最終ジャッジ日時 | 2024-10-03 06:54:41 |
合計ジャッジ時間 | 11,624 ms |
ジャッジサーバーID (参考情報) |
judge3 / 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
6,816 KB |
testcase_01 | AC | 1 ms
6,820 KB |
testcase_02 | WA | - |
testcase_03 | AC | 1 ms
6,820 KB |
testcase_04 | WA | - |
testcase_05 | AC | 1 ms
6,816 KB |
testcase_06 | WA | - |
testcase_07 | AC | 1 ms
6,820 KB |
testcase_08 | WA | - |
testcase_09 | AC | 1 ms
6,816 KB |
testcase_10 | WA | - |
testcase_11 | WA | - |
testcase_12 | WA | - |
testcase_13 | AC | 0 ms
6,820 KB |
testcase_14 | WA | - |
コンパイルメッセージ
warning: unused import: `std::io::Write` --> src/main.rs:153:5 | 153 | use std::io::Write; | ^^^^^^^^^^^^^^ | = note: `#[warn(unused_imports)]` on by default warning: type alias `Map` is never used --> src/main.rs:156:6 | 156 | type Map<K, V> = BTreeMap<K, V>; | ^^^ | = note: `#[warn(dead_code)]` on by default warning: type alias `Set` is never used --> src/main.rs:157:6 | 157 | type Set<T> = BTreeSet<T>; | ^^^ warning: type alias `Deque` is never used --> src/main.rs:158:6 | 158 | type Deque<T> = VecDeque<T>; | ^^^^^
ソースコード
pub trait SemiRing: Clone { fn zero() -> Self; fn one() -> Self; fn add(&self, rhs: &Self) -> Self; fn mul(&self, rhs: &Self) -> Self; } pub struct Kitamasa<T> { c: Vec<T>, tmp: std::cell::RefCell<Vec<T>>, } impl<T: SemiRing> Kitamasa<T> { pub fn new(c: Vec<T>) -> Self { assert!(!c.is_empty()); Self { c: c, tmp: std::cell::RefCell::new(vec![]), } } pub fn normalize(&self, d: &mut Vec<T>) { let n = self.c.len(); for i in (n..d.len()).rev() { let v = d.pop().unwrap(); for (d, c) in d[(i - n)..].iter_mut().zip(&self.c) { *d = d.add(&v.mul(c)); } } } pub fn next(&self, d: &mut Vec<T>) { d.insert(0, T::zero()); self.normalize(d); } pub fn twice(&self, d: &mut Vec<T>) { assert!(!d.is_empty()); let mut tmp = self.tmp.borrow_mut(); tmp.clear(); tmp.resize(d.len() * 2 - 1, T::zero()); for (i, a) in d.iter().enumerate() { for (tmp, b) in tmp[i..].iter_mut().zip(d.iter()) { *tmp = tmp.add(&a.mul(b)); } } std::mem::swap(&mut *tmp, d); drop(tmp); self.normalize(d); } pub fn merge(&self, x: &[T], y: &[T]) -> Vec<T> { assert!(x.len() > 0 && y.len() > 0); let mut res = vec![T::zero(); x.len() + y.len() - 1]; for (i, a) in x.iter().enumerate() { for (res, b) in res[i..].iter_mut().zip(y) { *res = a.mul(b).add(res); } } self.normalize(&mut res); res } pub fn kth_coefficient(&self, k: usize) -> Vec<T> { let mut t = vec![T::one()]; if k > 0 { let p = (k + 1).next_power_of_two().trailing_zeros() - 1; for i in (0..=p).rev() { self.twice(&mut t); if k >> i & 1 == 1 { self.next(&mut t); } } } t.resize(self.c.len(), T::zero()); t } pub fn find_kth(&self, a: &[T], k: usize) -> T { assert_eq!(a.len(), self.c.len()); let d = self.kth_coefficient(k); a.iter() .zip(d) .fold(T::zero(), |s, a| a.0.mul(&a.1).add(&s)) } } const MOD: u64 = 1_000_000_007; impl SemiRing for u64 { fn zero() -> Self { 0 } fn one() -> Self { 1 } fn add(&self, rhs: &Self) -> Self { let mut v = *self + *rhs; if v >= MOD { v -= MOD; } v } fn mul(&self, rhs: &Self) -> Self { *self * *rhs % MOD } } // ---------- begin input macro ---------- // reference: 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") }; } // ---------- end input macro ---------- 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 run() { input! { n: u64, } let m = n / 2; let ans = if n % 2 == 0 { let kita = Kitamasa::new(vec![1, 1]); kita.find_kth(&[1, 1], m as usize) } else { let kita = Kitamasa::new(vec![2, 1, MOD - 2, MOD - 1]); kita.find_kth(&[1, 2, 4, 10], m as usize) * ((n + 1) / 2 % MOD) % MOD }; println!("{}", ans); } fn main() { run(); }