#884487 (Rust) No.2358 xy+yz+zx=N

• 問題: No.2358 xy+yz+zx=N
• ユーザー: 👑 tipstar0125
• 提出日時: 2023-06-24 11:06:56
• 言語: Rust (1.77.0)
• 結果: AC
• 実行時間: 822 ms / 2,000 ms
• コード長: 7,014 bytes
• コンパイル時間: 1,867 ms
• コンパイル使用メモリ: 171,572 KB
• 実行使用メモリ: 4,380 KB
• 最終ジャッジ日時: 2023-09-14 10:18:27
• 合計ジャッジ時間: 6,754 ms
• ジャッジサーバーID （参考情報）: judge13 / judge11

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; 4,376 KB
testcase_02	AC	1 ms; 4,376 KB
testcase_03	AC	2 ms; 4,376 KB
testcase_04	AC	1 ms; 4,376 KB
testcase_05	AC	1 ms; 4,376 KB
testcase_06	AC	1 ms; 4,380 KB
testcase_07	AC	3 ms; 4,376 KB
testcase_08	AC	821 ms; 4,376 KB
testcase_09	AC	822 ms; 4,376 KB
testcase_10	AC	812 ms; 4,380 KB
testcase_11	AC	813 ms; 4,380 KB
testcase_12	AC	625 ms; 4,376 KB

ソースコード

#![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 st = BTreeSet::new();

        for x in 0..=n {
            for y in 0..=n {
                if x * y > n {
                    break;
                }
                let p = x + y;
                if p == 0 {
                    continue;
                }

                if (n - x * y) % p == 0 {
                    let mut v = vec![x, y, (n - x * y) / p];
                    v.sort();
                    st.insert(v);
                }
            }
        }
        let mut res = vec![];
        for v in st {
            if v[0] == v[1] && v[1] == v[2] {
                res.push(format!("{} {} {}", v[0], v[1], v[2]));
            } else if v[0] != v[1] && v[1] != v[2] && v[2] != v[0] {
                // 6 ord
                res.push(format!("{} {} {}", v[0], v[1], v[2]));
                res.push(format!("{} {} {}", v[1], v[2], v[0]));
                res.push(format!("{} {} {}", v[2], v[0], v[1]));
                res.push(format!("{} {} {}", v[0], v[2], v[1]));
                res.push(format!("{} {} {}", v[1], v[0], v[2]));
                res.push(format!("{} {} {}", v[2], v[1], v[0]));
            } else {
                // 2 ord
                res.push(format!("{} {} {}", v[0], v[1], v[2]));
                res.push(format!("{} {} {}", v[1], v[2], v[0]));
                res.push(format!("{} {} {}", v[2], v[0], v[1]));
            }
        }

        // 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!("{} {} {}", a[0], a[1], a[2]);
        // }
        println!("{}", res.len());
        for r in res {
            println!("{}", r);
        }
    }
}

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()))
}