結果

問題 No.248 ミラー君の宿題
ユーザー koba-e964koba-e964
提出日時 2017-01-22 03:49:16
言語 Rust
(1.77.0 + proconio)
結果
TLE  
実行時間 -
コード長 4,067 bytes
コンパイル時間 12,333 ms
コンパイル使用メモリ 378,176 KB
実行使用メモリ 7,424 KB
最終ジャッジ日時 2024-06-02 09:26:15
合計ジャッジ時間 21,938 ms
ジャッジサーバーID
(参考情報)
judge3 / judge2
このコードへのチャレンジ
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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 28 ms
5,248 KB
testcase_01 AC 24 ms
5,376 KB
testcase_02 AC 32 ms
5,376 KB
testcase_03 AC 42 ms
5,376 KB
testcase_04 AC 208 ms
5,376 KB
testcase_05 AC 224 ms
5,376 KB
testcase_06 AC 478 ms
5,376 KB
testcase_07 AC 1,998 ms
5,376 KB
testcase_08 AC 72 ms
5,376 KB
testcase_09 TLE -
testcase_10 -- -
testcase_11 -- -
testcase_12 -- -
testcase_13 -- -
testcase_14 -- -
testcase_15 -- -
testcase_16 -- -
testcase_17 -- -
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 #

#[allow(unused_imports)]
use std::cmp::*;
#[allow(unused_imports)]
use std::collections::*;
use std::io::*;
#[allow(dead_code)]
fn getline() -> String {
    let mut ret = String::new();
    std::io::stdin().read_line(&mut ret).ok();
    return ret;
}
fn get_word() -> String {
    let mut stdin = std::io::stdin();
    let mut u8b: [u8; 1] = [0];
    loop {
        let mut buf: Vec<u8> = Vec::with_capacity(16);
        loop {
            let res = stdin.read(&mut u8b);
            if res.is_err() || res.ok().unwrap() == 0 || u8b[0] <= ' ' as u8 {
                break;
            } else {
                buf.push(u8b[0]);
            }
        }
        if buf.len() >= 1 {
            let ret = std::string::String::from_utf8(buf).unwrap();
            return ret;
        }
    }
}
fn parse<T: std::str::FromStr>(s: &str) -> T { s.parse::<T>().ok().unwrap() }

#[allow(dead_code)]
fn get<T: std::str::FromStr>() -> T { parse(&get_word()) }


const DEBUG: bool = false;

fn calc_density(elem: u32, exp: u32) -> f64 {
    if elem > exp {
        return 0.0;
    }
    1.0 / (1u64 << exp + 1 - max(elem, 1)) as f64
}


fn solve(p: &[i64]) -> f64 {
    let n = p.len();
    let exp: Vec<u32> = p.iter().map(|v| (v - 1).trailing_zeros()).collect();
    let mut inex = vec![0.0f64; 1 << n];
    for b2 in (0 .. 1 << n).rev() {
        let mut cur = 1.0;
        for i in 0 .. n {
            if (b2 & (1 << i)) != 0 {
                cur /= p[i] as f64;
            }
        }
        for b3 in b2 + 1 .. 1 << n {
            if (b3 & b2) == b2 {
                cur -= inex[b3];
            }
        }
        inex[b2] = cur;
    }
    let mut dp = vec![1.0_f64; 1 << n];
    for bits in 1 .. 1usize << n {
        let pop = bits.count_ones();
        if pop == 1 {
            dp[bits] = 1.0;
            continue;
        }
        let mut factor = 1.0;
        for i in 0 .. n {
            if (bits & 1 << i) == 0 {
                factor *= p[i] as f64;
            }
        }
        let coprime = inex[(1 << n) - 1 - bits] * factor;
        let mut tot = 1.0;
        let mut loopback = 0.0;
        let mut b2 = (bits - 1) & bits;
        loop {
            if b2 == 0 { break; }
            tot += factor * inex[(1 << n) - 1 - bits + b2]
                * (dp[b2] + dp[bits ^ b2]);
            b2 = (b2 - 1) & bits;
        }
        loopback += factor * inex[(1 << n) - 1];
        b2 = bits;
        let exp_max = exp.iter().max().unwrap();
        loop {
            let mut prob = 0.0;
            for sh in 0 .. exp_max + 1 {
                // Find #c s.t. c^(2^(sh+1)) = 1 and (c^(2^sh) - 1) % prod(b2)p[i] == 0
                if b2 == bits && sh >= 1 {
                    continue;
                }
                let mut cur = 1.0;
                for i in 0 .. n {
                    if (bits & 1 << i) == 0 { continue; }
                    if (b2 & 1 << i) != 0 {
                        let mut sum = 0.0;
                        for j in 0 .. sh + 1 {
                            sum += calc_density(j, exp[i]);
                        }
                        cur *= sum;
                    } else {
                        cur *= calc_density(sh + 1, exp[i]);
                    }
                }
                prob += cur;
            }
            if DEBUG {
                println!("b2 = {}, prob = {} (tot = {}, loopback = {})", b2, prob, tot, loopback);
            }
            if b2 == 0 || b2 == bits {
                loopback += coprime * prob;
            } else {
                tot += coprime * prob * (dp[b2] + dp[b2 ^ bits]);
            }
            if b2 == 0 {
                break;
            }
            b2 = (b2 - 1) & bits;
        }
        dp[bits] = tot / (1.0 - loopback);
        if DEBUG { 
            println!("[{}] {}, {} ==> {}",  bits, tot, loopback, dp[bits]);
        }
    }
    dp[(1 << n) - 1]
}

fn main() {
    let t = get();
    for _ in 0 .. t {
        let n = get();
        let p: Vec<i64> = (0 .. n).map(|_| get()).collect();
        println!("{}", solve(&p));
    }
}
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