結果
| 問題 |
No.574 正多面体サイコロ
|
| コンテスト | |
| 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);
}