結果

問題 No.2358 xy+yz+zx=N
ユーザー tipstar0125
提出日時 2023-06-24 10:02:31
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 51 ms / 2,000 ms
コード長 5,437 bytes
コンパイル時間 13,708 ms
コンパイル使用メモリ 379,352 KB
実行使用メモリ 5,376 KB
最終ジャッジ日時 2024-07-01 17:46:12
合計ジャッジ時間 15,001 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 10
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 #
プレゼンテーションモードにする

#![allow(non_snake_case)]
#![allow(unused_imports)]
#![allow(unused_macros)]
#![allow(clippy::needless_range_loop)]
#![allow(clippy::comparison_chain)]
#![allow(clippy::nonminimal_bool)]
#![allow(clippy::neg_multiply)]
#![allow(dead_code)]
use std::cmp::Reverse;
use std::collections::{BTreeMap, BTreeSet, BinaryHeap, VecDeque};
#[derive(Default)]
struct Solver {}
impl Solver {
    fn solve(&mut self) {
        input! {
            N: usize
        }
        let mut ans = vec![];
        let MAX = (N as f64).sqrt().ceil() as usize;
        for x in 0..=MAX {
            for y in x..=MAX {
                if N < x * y || x + y == 0 {
                    continue;
                }
                if (N - x * y) % (x + y) != 0 {
                    continue;
                }
                let z = (N - x * y) / (x + y);
                if z < y {
                    continue;
                }
                let v = vec![x, y, z];
                let mut a = gen_perm(v);
                a.sort();
                a.dedup();
                ans.extend(a);
            }
        }
        ans.sort();
        ans.dedup();
        println!("{}", ans.len());
        for a in ans {
            println!("{}", join_to_string(&a, " "));
        }
    }
}
fn join_to_string<T: std::string::ToString>(v: &[T], sep: &str) -> String {
    v.iter()
        .fold("".to_string(), |s, x| s + x.to_string().as_str() + sep)
}
pub fn gen_perm<T>(v: Vec<T>) -> Vec<Vec<T>>
where
    T: Clone,
{
    let num_of_chars = v.len();
    let mut result = Vec::<Vec<T>>::new();
    result.push(v);
    for n in 0..num_of_chars {
        let result_len = result.len();
        for result_idx in 0..(result_len) {
            for i in (n + 1)..num_of_chars {
                let mut v_new = result[result_idx].clone();
                v_new.swap(n, i);
                result.push(v_new);
            }
        }
    }
    result
}
fn main() {
    std::thread::Builder::new()
        .stack_size(128 * 1024 * 1024)
        .spawn(|| Solver::default().solve())
        .unwrap()
        .join()
        .unwrap();
}
// fn read<T: std::str::FromStr>() -> T {
//     let mut s = String::new();
//     std::io::stdin().read_line(&mut s).ok();
//     s.trim().parse().ok().unwrap()
// }
// fn read_vec<T: std::str::FromStr>() -> Vec<T> {
//     read::<String>()
//         .split_whitespace()
//         .map(|e| e.parse().ok().unwrap())
//         .collect()
// }
#[macro_export]
macro_rules! input {
    () => {};
    (mut $var:ident: $t:tt, $($rest:tt)*) => {
        let mut $var = __input_inner!($t);
        input!($($rest)*)
    };
    ($var:ident: $t:tt, $($rest:tt)*) => {
        let $var = __input_inner!($t);
        input!($($rest)*)
    };
    (mut $var:ident: $t:tt) => {
        let mut $var = __input_inner!($t);
    };
    ($var:ident: $t:tt) => {
        let $var = __input_inner!($t);
    };
}
#[macro_export]
macro_rules! __input_inner {
    (($($t:tt),*)) => {
        ($(__input_inner!($t)),*)
    };
    ([$t:tt; $n:expr]) => {
        (0..$n).map(|_| __input_inner!($t)).collect::<Vec<_>>()
    };
    ([$t:tt]) => {{
        let n = __input_inner!(usize);
        (0..n).map(|_| __input_inner!($t)).collect::<Vec<_>>()
    }};
    (chars) => {
        __input_inner!(String).chars().collect::<Vec<_>>()
    };
    (bytes) => {
        __input_inner!(String).into_bytes()
    };
    (usize1) => {
        __input_inner!(usize) - 1
    };
    ($t:ty) => {
        $crate::read::<$t>()
    };
}
#[macro_export]
macro_rules! println {
    () => {
        $crate::write(|w| {
            use std::io::Write;
            std::writeln!(w).unwrap()
        })
    };
    ($($arg:tt)*) => {
        $crate::write(|w| {
            use std::io::Write;
            std::writeln!(w, $($arg)*).unwrap()
        })
    };
}
#[macro_export]
macro_rules! print {
    ($($arg:tt)*) => {
        $crate::write(|w| {
            use std::io::Write;
            std::write!(w, $($arg)*).unwrap()
        })
    };
}
#[macro_export]
macro_rules! flush {
    () => {
        $crate::write(|w| {
            use std::io::Write;
            w.flush().unwrap()
        })
    };
}
pub fn read<T>() -> T
where
    T: std::str::FromStr,
    T::Err: std::fmt::Debug,
{
    use std::cell::RefCell;
    use std::io::*;
    thread_local! {
        pub static STDIN: RefCell<StdinLock<'static>> = RefCell::new(stdin().lock());
    }
    STDIN.with(|r| {
        let mut r = r.borrow_mut();
        let mut s = vec![];
        loop {
            let buf = r.fill_buf().unwrap();
            if buf.is_empty() {
                break;
            }
            if let Some(i) = buf.iter().position(u8::is_ascii_whitespace) {
                s.extend_from_slice(&buf[..i]);
                r.consume(i + 1);
                if !s.is_empty() {
                    break;
                }
            } else {
                s.extend_from_slice(buf);
                let n = buf.len();
                r.consume(n);
            }
        }
        std::str::from_utf8(&s).unwrap().parse().unwrap()
    })
}
pub fn write<F>(f: F)
where
    F: FnOnce(&mut std::io::BufWriter<std::io::StdoutLock>),
{
    use std::cell::RefCell;
    use std::io::*;
    thread_local! {
        pub static STDOUT: RefCell<BufWriter<StdoutLock<'static>>> =
            RefCell::new(BufWriter::new(stdout().lock()));
    }
    STDOUT.with(|w| f(&mut w.borrow_mut()))
}
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