結果

問題 No.955 ax^2+bx+c=0
ユーザー akiradeveloperakiradeveloper
提出日時 2019-12-18 12:08:54
言語 Rust
(1.77.0)
結果
WA  
実行時間 -
コード長 5,861 bytes
コンパイル時間 4,237 ms
コンパイル使用メモリ 156,152 KB
実行使用メモリ 4,504 KB
最終ジャッジ日時 2023-09-21 06:13:11
合計ジャッジ時間 6,455 ms
ジャッジサーバーID
（参考情報） 		judge15 / judge14
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 1 ms
4,376 KB
testcase_01 AC 1 ms
4,380 KB
testcase_02 AC 1 ms
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testcase_03 AC 1 ms
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testcase_04 AC 1 ms
4,376 KB
testcase_05 AC 1 ms
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testcase_06 AC 1 ms
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testcase_07 AC 1 ms
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testcase_08 AC 1 ms
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testcase_09 AC 1 ms
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testcase_10 AC 1 ms
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testcase_11 AC 1 ms
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testcase_12 AC 1 ms
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testcase_13 AC 2 ms
4,376 KB
testcase_14 AC 1 ms
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testcase_15 AC 1 ms
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testcase_16 AC 1 ms
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testcase_17 AC 1 ms
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testcase_18 AC 1 ms
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testcase_19 AC 1 ms
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testcase_20 AC 1 ms
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testcase_21 AC 1 ms
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testcase_22 AC 1 ms
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testcase_23 AC 2 ms
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testcase_24 AC 1 ms
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testcase_25 AC 1 ms
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testcase_26 AC 2 ms
4,376 KB
testcase_27 AC 1 ms
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testcase_28 AC 1 ms
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testcase_29 AC 1 ms
4,380 KB
testcase_30 AC 1 ms
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testcase_31 AC 1 ms
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testcase_32 AC 1 ms
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testcase_33 AC 1 ms
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testcase_34 WA -
testcase_35 WA -
testcase_36 WA -
testcase_37 WA -
testcase_38 WA -
testcase_39 WA -
testcase_40 WA -
testcase_41 WA -
testcase_42 WA -
testcase_43 WA -
testcase_44 WA -
testcase_45 WA -
testcase_46 WA -
testcase_47 WA -
testcase_48 WA -
testcase_49 WA -
testcase_50 WA -
testcase_51 WA -
testcase_52 WA -
testcase_53 WA -
testcase_54 WA -
testcase_55 WA -
testcase_56 WA -
testcase_57 WA -
testcase_58 WA -
testcase_59 WA -
testcase_60 WA -
testcase_61 WA -
testcase_62 AC 1 ms
4,376 KB
testcase_63 WA -
testcase_64 AC 1 ms
4,380 KB
testcase_65 WA -
testcase_66 AC 2 ms
4,384 KB
testcase_67 AC 1 ms
4,376 KB
testcase_68 AC 1 ms
4,380 KB
testcase_69 AC 1 ms
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testcase_70 WA -
testcase_71 AC 1 ms
4,376 KB
testcase_72 AC 1 ms
4,380 KB
testcase_73 AC 1 ms
4,376 KB
testcase_74 AC 1 ms
4,380 KB
testcase_75 AC 1 ms
4,376 KB
testcase_76 AC 1 ms
4,380 KB
testcase_77 WA -
testcase_78 WA -
testcase_79 WA -
testcase_80 AC 1 ms
4,380 KB
testcase_81 AC 1 ms
4,380 KB
testcase_82 AC 1 ms
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testcase_83 AC 1 ms
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testcase_84 AC 1 ms
4,376 KB
testcase_85 AC 1 ms
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testcase_86 AC 1 ms
4,376 KB
testcase_87 AC 1 ms
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testcase_88 AC 1 ms
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testcase_89 AC 1 ms
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testcase_90 AC 1 ms
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testcase_91 AC 1 ms
4,376 KB
testcase_92 AC 1 ms
4,376 KB
testcase_93 AC 1 ms
4,376 KB
testcase_94 AC 1 ms
4,376 KB
testcase_95 AC 1 ms
4,380 KB
testcase_96 AC 1 ms
4,380 KB
testcase_97 AC 1 ms
4,380 KB
testcase_98 AC 1 ms
4,376 KB
testcase_99 AC 2 ms
4,380 KB
testcase_100 AC 1 ms
4,380 KB
testcase_101 AC 1 ms
4,380 KB
testcase_102 AC 1 ms
4,376 KB
testcase_103 AC 1 ms
4,376 KB
testcase_104 AC 1 ms
4,380 KB
testcase_105 AC 1 ms
4,376 KB
testcase_106 AC 1 ms
4,376 KB
testcase_107 AC 1 ms
4,376 KB
testcase_108 AC 1 ms
4,376 KB
testcase_109 AC 1 ms
4,376 KB
testcase_110 AC 1 ms
4,380 KB
testcase_111 AC 2 ms
4,376 KB
testcase_112 AC 1 ms
4,380 KB
testcase_113 AC 1 ms
4,380 KB
testcase_114 AC 1 ms
4,376 KB
testcase_115 AC 1 ms
4,376 KB
testcase_116 AC 1 ms
4,380 KB
testcase_117 AC 1 ms
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testcase_118 AC 1 ms
4,380 KB
testcase_119 AC 1 ms
4,376 KB
testcase_120 AC 1 ms
4,376 KB
testcase_121 AC 1 ms
4,376 KB
testcase_122 WA -
testcase_123 AC 1 ms
4,380 KB
testcase_124 WA -
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コンパイルメッセージ
warning: unused variable: `out`
   --> Main.rs:112:13
    |
112 |     let mut out = BufWriter::new(out.lock());
    |             ^^^ help: if this is intentional, prefix it with an underscore: `_out`
    |
    = note: `#[warn(unused_variables)]` on by default

warning: variable does not need to be mutable
   --> Main.rs:112:9
    |
112 |     let mut out = BufWriter::new(out.lock());
    |         ----^^^
    |         |
    |         help: remove this `mut`
    |
    = note: `#[warn(unused_mut)]` on by default

warning: 2 warnings emitted

ソースコード

diff # 

#[doc = " https://github.com/hatoo/competitive-rust-snippets"]
#[allow(unused_imports)]
use std::cmp::{max, min, Ordering};
#[allow(unused_imports)]
use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, VecDeque};
#[allow(unused_imports)]
use std::io::{stdin, stdout, BufWriter, Write};
#[allow(unused_imports)]
use std::iter::FromIterator;
#[macro_export]
macro_rules ! chmax { ( $ x : expr , $ ( $ v : expr ) ,+ ) => { $ ( $ x = std :: cmp :: max ( $ x ,$ v ) ; ) + } ; }
#[macro_export]
macro_rules ! chmin { ( $ x : expr , $ ( $ v : expr ) ,+ ) => { $ ( $ x = std :: cmp :: min ( $ x ,$ v ) ; ) + } ; }
#[macro_export]
macro_rules ! max { ( $ x : expr ) => ( $ x ) ; ( $ x : expr , $ ( $ xs : expr ) ,+ ) => { std :: cmp :: max ( $ x , max ! ( $ ( $ xs ) ,+ ) ) } ; }
#[macro_export]
macro_rules ! min { ( $ x : expr ) => ( $ x ) ; ( $ x : expr , $ ( $ xs : expr ) ,+ ) => { std :: cmp :: min ( $ x , min ! ( $ ( $ xs ) ,+ ) ) } ; }
#[macro_export]
macro_rules ! dvec { ( $ t : expr ; $ len : expr ) => { vec ! [ $ t ; $ len ] } ; ( $ t : expr ; $ len : expr , $ ( $ rest : expr ) ,* ) => { vec ! [ dvec ! ( $ t ; $ ( $ rest ) ,* ) ; $ len ] } ; }
#[allow(unused_macros)]
macro_rules ! debug { ( $ ( $ a : expr ) ,* ) => { eprintln ! ( concat ! ( $ ( stringify ! ( $ a ) , " = {:?}, " ) ,* ) , $ ( $ a ) ,* ) ; } }
#[macro_export]
macro_rules ! input { ( source = $ s : expr , $ ( $ r : tt ) * ) => { let mut parser = Parser :: from_str ( $ s ) ; input_inner ! { parser , $ ( $ r ) * } } ; ( parser = $ parser : ident , $ ( $ r : tt ) * ) => { input_inner ! { $ parser , $ ( $ r ) * } } ; ( new_stdin_parser = $ parser : ident , $ ( $ r : tt ) * ) => { let stdin = std :: io :: stdin ( ) ; let reader = std :: io :: BufReader :: new ( stdin . lock ( ) ) ; let mut $ parser = Parser :: new ( reader ) ; input_inner ! { $ parser , $ ( $ r ) * } } ; ( $ ( $ r : tt ) * ) => { input ! { new_stdin_parser = parser , $ ( $ r ) * } } ; }
#[macro_export]
macro_rules ! input_inner { ( $ parser : ident ) => { } ; ( $ parser : ident , ) => { } ; ( $ parser : ident , $ var : ident : $ t : tt $ ( $ r : tt ) * ) => { let $ var = read_value ! ( $ parser , $ t ) ; input_inner ! { $ parser $ ( $ r ) * } } ; }
#[macro_export]
macro_rules ! read_value { ( $ parser : ident , ( $ ( $ t : tt ) ,* ) ) => { ( $ ( read_value ! ( $ parser , $ t ) ) ,* ) } ; ( $ parser : ident , [ $ t : tt ; $ len : expr ] ) => { ( 0 ..$ len ) . map ( | _ | read_value ! ( $ parser , $ t ) ) . collect ::< Vec < _ >> ( ) } ; ( $ parser : ident , chars ) => { read_value ! ( $ parser , String ) . chars ( ) . collect ::< Vec < char >> ( ) } ; ( $ parser : ident , usize1 ) => { read_value ! ( $ parser , usize ) - 1 } ; ( $ parser : ident , $ t : ty ) => { $ parser . next ::<$ t > ( ) . expect ( "Parse error" ) } ; }
use std::io;
use std::io::BufRead;
use std::str;
pub struct Parser<R> {
    reader: R,
    buf: Vec<u8>,
    pos: usize,
}
impl Parser<io::Empty> {
    pub fn from_str(s: &str) -> Parser<io::Empty> {
        Parser {
            reader: io::empty(),
            buf: s.as_bytes().to_vec(),
            pos: 0,
        }
    }
}
impl<R: BufRead> Parser<R> {
    pub fn new(reader: R) -> Parser<R> {
        Parser {
            reader: reader,
            buf: vec![],
            pos: 0,
        }
    }
    pub fn update_buf(&mut self) {
        self.buf.clear();
        self.pos = 0;
        loop {
            let (len, complete) = {
                let buf2 = self.reader.fill_buf().unwrap();
                self.buf.extend_from_slice(buf2);
                let len = buf2.len();
                if len == 0 {
                    break;
                }
                (len, buf2[len - 1] <= 0x20)
            };
            self.reader.consume(len);
            if complete {
                break;
            }
        }
    }
    pub fn next<T: str::FromStr>(&mut self) -> Result<T, T::Err> {
        loop {
            let mut begin = self.pos;
            while begin < self.buf.len() && (self.buf[begin] <= 0x20) {
                begin += 1;
            }
            let mut end = begin;
            while end < self.buf.len() && (self.buf[end] > 0x20) {
                end += 1;
            }
            if begin != self.buf.len() {
                self.pos = end;
                return str::from_utf8(&self.buf[begin..end]).unwrap().parse::<T>();
            } else {
                self.update_buf();
            }
        }
    }
}
#[allow(unused_macros)]
macro_rules ! debug { ( $ ( $ a : expr ) ,* ) => { eprintln ! ( concat ! ( $ ( stringify ! ( $ a ) , " = {:?}, " ) ,* ) , $ ( $ a ) ,* ) ; } }
#[doc = " https://github.com/hatoo/competitive-rust-snippets"]
const BIG_STACK_SIZE: bool = true;
#[allow(dead_code)]
fn main() {
    use std::thread;
    if BIG_STACK_SIZE {
        thread::Builder::new()
            .stack_size(32 * 1024 * 1024)
            .name("solve".into())
            .spawn(solve)
            .unwrap()
            .join()
            .unwrap();
    } else {
        solve();
    }
}
fn solve() {
    let out = stdout();
    let mut out = BufWriter::new(out.lock());
    input!{
        a:f64,b:f64,c:f64,
    }
    if a==0.0 && b==0.0 && c==0.0 {
        println!("-1");
        return
    }

    if a==0.0 && b==0.0 {
        println!("0");
        return
    }

    if a==0.0 {
        if b==0.0 {
            println!("0");
        } else {
            println!("1");
            println!("{}", -1.0 * c/b);
        }
    } else {
        let d = b*b - 4.0*a*c;
        if d < 0.0 {
            println!("0");
        } else if d == 0.0 {
            println!("1");
            println!("{}", -1.0*b / (2.0*a));
        } else {
            println!("2");
            println!("{}", (-1.0*b - f64::sqrt(d)) / (2.0*a));
            println!("{}", (-1.0*b + f64::sqrt(d)) / (2.0*a));
        }
    }
}
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