#410014 (Rust) No.955 ax^2+bx+c=0

• 問題: No.955 ax^2+bx+c=0
• ユーザー: akiradeveloper
• 提出日時: 2019-12-18 12:12:46
• 言語: Rust (1.77.0 + proconio)
• 結果: WA
• 実行時間: -
• コード長: 5,803 bytes
• コンパイル時間: 14,838 ms
• コンパイル使用メモリ: 384,528 KB
• 実行使用メモリ: 6,948 KB
• 最終ジャッジ日時: 2024-07-07 00:41:11
• 合計ジャッジ時間: 17,135 ms
• ジャッジサーバーID （参考情報）: judge2 / judge1

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	1 ms; 5,248 KB
testcase_01	AC	1 ms; 5,376 KB
testcase_02	AC	1 ms; 5,376 KB
testcase_03	AC	1 ms; 5,376 KB
testcase_04	AC	1 ms; 5,376 KB
testcase_05	AC	1 ms; 5,376 KB
testcase_06	AC	1 ms; 5,376 KB
testcase_07	AC	1 ms; 5,376 KB
testcase_08	AC	1 ms; 5,376 KB
testcase_09	AC	1 ms; 5,376 KB
testcase_10	AC	1 ms; 5,376 KB
testcase_11	AC	1 ms; 5,376 KB
testcase_12	AC	1 ms; 5,376 KB
testcase_13	AC	1 ms; 5,376 KB
testcase_14	AC	1 ms; 5,376 KB
testcase_15	AC	1 ms; 5,376 KB
testcase_16	AC	1 ms; 5,376 KB
testcase_17	AC	1 ms; 5,376 KB
testcase_18	AC	2 ms; 5,376 KB
testcase_19	AC	1 ms; 5,376 KB
testcase_20	AC	1 ms; 5,376 KB
testcase_21	AC	1 ms; 5,376 KB
testcase_22	AC	1 ms; 5,376 KB
testcase_23	AC	1 ms; 5,376 KB
testcase_24	AC	1 ms; 5,376 KB
testcase_25	AC	2 ms; 5,376 KB
testcase_26	AC	1 ms; 5,376 KB
testcase_27	AC	1 ms; 5,376 KB
testcase_28	AC	1 ms; 5,376 KB
testcase_29	AC	1 ms; 5,376 KB
testcase_30	AC	1 ms; 5,376 KB
testcase_31	AC	1 ms; 5,376 KB
testcase_32	AC	1 ms; 5,376 KB
testcase_33	AC	1 ms; 5,376 KB
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	2 ms; 5,376 KB
testcase_63	WA	-
testcase_64	AC	1 ms; 5,376 KB
testcase_65	WA	-
testcase_66	AC	1 ms; 5,376 KB
testcase_67	AC	1 ms; 5,376 KB
testcase_68	AC	1 ms; 5,376 KB
testcase_69	AC	1 ms; 5,376 KB
testcase_70	WA	-
testcase_71	AC	1 ms; 5,376 KB
testcase_72	AC	1 ms; 5,376 KB
testcase_73	AC	1 ms; 5,376 KB
testcase_74	AC	1 ms; 5,376 KB
testcase_75	AC	1 ms; 5,376 KB
testcase_76	AC	1 ms; 5,376 KB
testcase_77	WA	-
testcase_78	WA	-
testcase_79	WA	-
testcase_80	AC	1 ms; 5,376 KB
testcase_81	AC	1 ms; 5,376 KB
testcase_82	AC	1 ms; 5,376 KB
testcase_83	AC	1 ms; 5,376 KB
testcase_84	AC	1 ms; 5,376 KB
testcase_85	AC	2 ms; 5,376 KB
testcase_86	AC	1 ms; 5,376 KB
testcase_87	AC	1 ms; 5,376 KB
testcase_88	AC	1 ms; 5,376 KB
testcase_89	AC	1 ms; 5,376 KB
testcase_90	AC	1 ms; 5,376 KB
testcase_91	AC	1 ms; 5,376 KB
testcase_92	AC	1 ms; 5,376 KB
testcase_93	AC	1 ms; 5,376 KB
testcase_94	AC	1 ms; 5,376 KB
testcase_95	AC	1 ms; 5,376 KB
testcase_96	AC	1 ms; 5,376 KB
testcase_97	AC	1 ms; 5,376 KB
testcase_98	AC	1 ms; 5,376 KB
testcase_99	AC	2 ms; 5,376 KB
testcase_100	AC	1 ms; 5,376 KB
testcase_101	AC	1 ms; 5,376 KB
testcase_102	AC	1 ms; 5,376 KB
testcase_103	AC	1 ms; 5,376 KB
testcase_104	AC	1 ms; 5,376 KB
testcase_105	AC	1 ms; 5,376 KB
testcase_106	AC	1 ms; 5,376 KB
testcase_107	AC	1 ms; 5,376 KB
testcase_108	AC	2 ms; 5,376 KB
testcase_109	AC	1 ms; 5,376 KB
testcase_110	AC	1 ms; 5,376 KB
testcase_111	AC	1 ms; 5,376 KB
testcase_112	AC	1 ms; 5,376 KB
testcase_113	AC	1 ms; 5,376 KB
testcase_114	AC	1 ms; 5,376 KB
testcase_115	AC	1 ms; 5,376 KB
testcase_116	AC	1 ms; 5,376 KB
testcase_117	AC	1 ms; 5,376 KB
testcase_118	AC	1 ms; 5,376 KB
testcase_119	AC	1 ms; 5,376 KB
testcase_120	AC	1 ms; 5,376 KB
testcase_121	AC	1 ms; 5,376 KB
testcase_122	WA	-
testcase_123	AC	1 ms; 5,376 KB
testcase_124	WA	-

コンパイルメッセージ

warning: unused variable: `out`
   --> src/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
   --> src/main.rs:112:9
    |
112 |     let mut out = BufWriter::new(out.lock());
    |         ----^^^
    |         |
    |         help: remove this `mut`
    |
    = note: `#[warn(unused_mut)]` on by default

ソースコード

#[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 {
        if b==0.0 {
            if c==0.0 {
                println!("-1");
            } else {
                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));
        }
    }
}