結果

問題 No.550 夏休みの思い出（１）
ユーザー snteasntea
提出日時 2017-10-05 17:04:35
言語 Rust
(1.77.0)
結果
WA  
実行時間 -
コード長 2,618 bytes
コンパイル時間 2,937 ms
コンパイル使用メモリ 151,684 KB
実行使用メモリ 4,508 KB
最終ジャッジ日時 2023-08-10 14:34:39
合計ジャッジ時間 5,096 ms
ジャッジサーバーID
（参考情報） 		judge11 / judge12
このコードへのチャレンジ（β）

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 WA -
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権限があれば一括ダウンロードができます
コンパイルメッセージ
warning: unused macro definition: `readlvec`
  --> Main.rs:29:14
   |
29 | macro_rules! readlvec {
   |              ^^^^^^^^
   |
   = note: `#[warn(unused_macros)]` on by default

warning: unused macro definition: `mvec`
  --> Main.rs:39:14
   |
39 | macro_rules! mvec {
   |              ^^^^

warning: unused variable: `rt`
  --> Main.rs:84:9
   |
84 |     let rt = (bb*bb-4.0*cc).sqrt();
   |         ^^ help: if this is intentional, prefix it with an underscore: `_rt`
   |
   = note: `#[warn(unused_variables)]` on by default

warning: function `printiter` is never used
  --> Main.rs:54:4
   |
54 | fn printiter<'a, T>(v: &'a T)
   |    ^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: 4 warnings emitted

ソースコード

diff # 

// use std::ops::{Index, IndexMut};
// use std::cmp::{Ordering, min, max};
// use std::collections::{BinaryHeap, BTreeMap};
// use std::collections::btree_map::Entry::{Occupied, Vacant};
// use std::clone::Clone;

fn getline() -> String{
    let mut res = String::new();
    std::io::stdin().read_line(&mut res).ok();
    res
}

macro_rules! readl {
    ($t: ty) => {
        {
            let s = getline();
            s.trim().parse::<$t>().unwrap()
        }
    };
    ($( $t: ty),+ ) => {
        {
            let s = getline();
            let mut iter = s.trim().split(' ');
            ($(iter.next().unwrap().parse::<$t>().unwrap(),)*) 
        }
    };
}

macro_rules! readlvec {
    ($t: ty) => {
        {
            let s = getline();
            let iter = s.trim().split(' ');
            iter.map(|x| x.parse().unwrap()).collect::<Vec<$t>>()
        }
    }
}

macro_rules! mvec {
    ($v: expr, $s: expr) => {
        vec![$v; $s]
    };
    ($v: expr, $s: expr, $($t: expr),*) => {
        vec![mvec!($v, $($t),*); $s]
    };
}

macro_rules! debug {
    ($x: expr) => {
        println!("{}: {:?}", stringify!($x), $x)
    }
}

fn printiter<'a, T>(v: &'a T)
where
    &'a T: std::iter::IntoIterator, 
    <&'a T as std::iter::IntoIterator>::Item: std::fmt::Display {
    for (i,e) in v.into_iter().enumerate() {
        if i != 0 {
            print!(" ");
        }
        print!("{}", e);
    }
    println!("");
}

fn main() {
    let (a, b, c) = readl!(i64, i64, i64);
    let mut ans0 = None;
    for d in 0..1_000_001 {
        let calc = |x: i64| x*x*x + a*x*x + b*x + c;
        if calc(d) == 0 {
            ans0 = Some(d);
            break;
        }
        if calc(-d) == 0 {
            ans0 = Some(-d);
            break;
        }
    }
    let ans0 = ans0.unwrap();
    let bb = a as f64 + ans0 as f64;
    let cc = b as f64 + bb * ans0 as f64;
    let rt = (bb*bb-4.0*cc).sqrt();
    
    let mut ans = Vec::new();
    
    let calc = |x: f64| x*x+bb*x+cc;

    debug!(ans0);
    debug!(-bb/2.0);
    debug!(calc(0.0));
    let mut l = -1e9-1.0;
    let mut r = -bb/2.0;
    for _ in 0..100 {
        let m = (l+r)/2.0;
        if calc(m) < 0.0 {
            r = m;
        } else {
            l = m;
        }
    }
    ans.push(l.round() as i64);
    
    let mut l = -bb/2.0;
    let mut r = 1e9+1.0;
    for _ in 0..100 {
        let m = (l+r)/2.0;
        if calc(m) > 0.0 {
            r = m;
        } else {
            l = m;
        }
    }
    ans.push(l.round() as i64);
    
    ans.push(ans0);
    ans.sort();
    println!("{} {} {}", ans[0], ans[1], ans[2]);
}
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