結果
問題 | No.1407 Kindness |
ユーザー |
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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 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 36 |
ソースコード
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) -> TwhereT: std::str::FromStr,<T as std::str::FromStr>::Err: std::fmt::Debug,{self.skip_blanks();assert!(self.i < self.l.len()); // remain some characterassert_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>whereT: 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()}}