結果
問題 |
No.574 正多面体サイコロ
|
ユーザー |
|
提出日時 | 2017-10-11 20:44:34 |
言語 | Rust (1.83.0 + proconio) |
結果 |
AC
|
実行時間 | 73 ms / 2,000 ms |
コード長 | 3,070 bytes |
コンパイル時間 | 12,394 ms |
コンパイル使用メモリ | 382,120 KB |
実行使用メモリ | 6,824 KB |
最終ジャッジ日時 | 2024-11-17 09:45:04 |
合計ジャッジ時間 | 14,232 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 20 |
ソースコード
#[allow(unused_imports)] use std::cmp::{max, min}; #[allow(unused_imports)] use std::collections::{HashMap, HashSet}; mod util { use std::io::stdin; use std::str::FromStr; use std::fmt::Debug; #[allow(dead_code)] pub fn line() -> String { let mut line: String = String::new(); stdin().read_line(&mut line).unwrap(); line.trim().to_string() } #[allow(dead_code)] pub fn get<T: FromStr>() -> T where <T as FromStr>::Err: Debug, { let mut line: String = String::new(); stdin().read_line(&mut line).unwrap(); line.trim().parse().unwrap() } #[allow(dead_code)] pub fn gets<T: FromStr>() -> Vec<T> where <T as FromStr>::Err: Debug, { let mut line: String = String::new(); stdin().read_line(&mut line).unwrap(); line.split_whitespace() .map(|t| t.parse().unwrap()) .collect() } #[allow(dead_code)] pub fn get2<T: FromStr, U: FromStr>() -> (T, U) where <T as FromStr>::Err: Debug, <U as FromStr>::Err: Debug, { let mut line: String = String::new(); stdin().read_line(&mut line).unwrap(); let mut iter = line.split_whitespace(); ( iter.next().unwrap().parse().unwrap(), iter.next().unwrap().parse().unwrap(), ) } #[allow(dead_code)] pub fn get3<S: FromStr, T: FromStr, U: FromStr>() -> (S, T, U) where <S as FromStr>::Err: Debug, <T as FromStr>::Err: Debug, <U as FromStr>::Err: Debug, { let mut line: String = String::new(); stdin().read_line(&mut line).unwrap(); let mut iter = line.split_whitespace(); ( iter.next().unwrap().parse().unwrap(), iter.next().unwrap().parse().unwrap(), iter.next().unwrap().parse().unwrap(), ) } } #[allow(unused_macros)] macro_rules! debug { ($x: expr) => { println!("{}: {:?}", stringify!($x), $x) } } fn main() { let (f, n, k): (usize, usize, usize) = util::get3(); let mut e = 0.0; for m in 1..f + 1 { let mut dp = vec![vec![vec![0.0; k + 1]; k]; n + 1]; dp[0][0][0] = 1.0; for i in 1..n + 1 { for j in 0..k { for h in 0..k + 1 { if h >= 1 { dp[i][j][h] += dp[i - 1][j][h - 1] / f as f64; } if h == k { dp[i][j][h] += dp[i - 1][j][h] / f as f64; } if j >= 1 { dp[i][j][h] += dp[i - 1][j - 1][h] * ((f - m) as f64) / f as f64; } dp[i][j][h] += dp[i - 1][j][h] * ((m - 1) as f64) / f as f64; } } } for i in 0..k { for j in 0..k + 1 { if j >= k - i { e += m as f64 * dp[n][i][j]; } } } } println!("{}", e); }