結果

問題 No.1407 Kindness
ユーザー ikdikd
提出日時 2021-02-26 22:44:02
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 38 ms / 2,000 ms
コード長 3,160 bytes
コンパイル時間 20,446 ms
コンパイル使用メモリ 384,476 KB
実行使用メモリ 22,132 KB
最終ジャッジ日時 2024-10-02 15:26:50
合計ジャッジ時間 16,200 ms
ジャッジサーバーID
(参考情報)
judge4 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 36
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

const MO: u64 = 1_000_000_000 + 7;
use std::collections::HashMap;
fn solve(s: &[u64], carry: bool, memo: &mut HashMap<(usize, bool), u64>) -> u64 {
let len = s.len();
if len == 1 {
let u = s[0] - carry as u64;
return 1 + (1..=u).sum::<u64>() % MO;
}
if let Some(&ans) = memo.get(&(len, carry)) {
return ans;
}
let t = &s[..(len - 1)];
let ans = match (s.last(), carry) {
(Some(0), true) => {
let ans = (0..=9).sum::<u64>() * solve(t, true, memo);
(ans + 1) % MO
}
(Some(&d), carry) => {
let d = d - carry as u64;
let ans = (0..=d).sum::<u64>() * solve(t, false, memo)
+ ((d + 1)..=9).sum::<u64>() * solve(t, true, memo);
(ans + 1) % MO
}
_ => unreachable!(),
};
memo.insert((len, carry), ans);
ans
}
fn main() {
let stdin = std::io::stdin();
let mut rd = ProconReader::new(stdin.lock());
let s: Vec<char> = rd.get_chars();
let s: Vec<u64> = s.into_iter().map(|d| d as u64 - '0' as u64).collect();
let mut memo = HashMap::new();
let ans = solve(&s, false, &mut memo);
println!("{}", (MO + ans - 1) % MO);
}
pub struct ProconReader<R> {
r: R,
l: String,
i: usize,
}
impl<R: std::io::BufRead> ProconReader<R> {
pub fn new(reader: R) -> Self {
Self {
r: reader,
l: String::new(),
i: 0,
}
}
pub fn get<T>(&mut self) -> T
where
T: std::str::FromStr,
<T as std::str::FromStr>::Err: std::fmt::Debug,
{
self.skip_blanks();
assert!(self.i < self.l.len()); // remain some character
assert_ne!(&self.l[self.i..=self.i], " ");
let rest = &self.l[self.i..];
let len = rest.find(' ').unwrap_or_else(|| rest.len());
// parse self.l[self.i..(self.i + len)]
let val = rest[..len]
.parse()
.unwrap_or_else(|e| panic!("{:?}, attempt to read `{}`", e, rest));
self.i += len;
val
}
fn skip_blanks(&mut self) {
loop {
match self.l[self.i..].find(|ch| ch != ' ') {
Some(j) => {
self.i += j;
break;
}
None => {
let mut buf = String::new();
let num_bytes = self
.r
.read_line(&mut buf)
.unwrap_or_else(|_| panic!("invalid UTF-8"));
assert!(num_bytes > 0, "reached EOF :(");
self.l = buf
.trim_end_matches('\n')
.trim_end_matches('\r')
.to_string();
self.i = 0;
}
}
}
}
pub fn get_vec<T>(&mut self, n: usize) -> Vec<T>
where
T: std::str::FromStr,
<T as std::str::FromStr>::Err: std::fmt::Debug,
{
(0..n).map(|_| self.get()).collect()
}
pub fn get_chars(&mut self) -> Vec<char> {
self.get::<String>().chars().collect()
}
}
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