#919756 (Rust) No.2500 Products in a Range

• 問題: No.2500 Products in a Range
• ユーザー: naut3
• 提出日時: 2023-10-13 21:38:11
• 言語: Rust (1.83.0 + proconio)
• 結果: TLE
• 実行時間: -
• コード長: 6,127 bytes
• コンパイル時間: 21,301 ms
• コンパイル使用メモリ: 378,036 KB
• 実行使用メモリ: 10,624 KB
• 最終ジャッジ日時: 2024-09-15 17:15:32
• 合計ジャッジ時間: 19,808 ms
• ジャッジサーバーID （参考情報）: judge1 / judge4

ファイルパターン	結果
other	AC * 7 TLE * 2 -- * 52

ソースコード

#![allow(non_snake_case, unused_imports, unused_must_use)]
use std::io::{self, prelude::*};
use std::str;

fn main() {
    let (stdin, stdout) = (io::stdin(), io::stdout());
    let mut scan = Scanner::new(stdin.lock());
    let mut out = io::BufWriter::new(stdout.lock());

    macro_rules! input {
        ($T: ty) => {
            scan.token::<$T>()
        };
        ($T: ty, $N: expr) => {
            (0..$N).map(|_| scan.token::<$T>()).collect::<Vec<_>>()
        };
    }

    let N = input!(usize);
    let L = input!(isize);
    let R = input!(isize);
    let mut A = input!(isize, N);
    A.sort();
    let A = A;

    let mut ans = 1;

    for l in 0..N {
        let mut neg: std::collections::BTreeSet<(isize, usize)> = std::collections::BTreeSet::new();
        let mut zer: std::collections::BTreeSet<(isize, usize)> = std::collections::BTreeSet::new();
        let mut pos: std::collections::BTreeSet<(isize, usize)> = std::collections::BTreeSet::new();

        let a = A[l];
        if a < 0 {
            neg.insert((a, l));
        } else if a == 0 {
            zer.insert((a, l));
        } else {
            pos.insert((a, l));
        }

        if l + 1 < N {
            let a = A[l + 1];
            if a < 0 {
                neg.insert((a, l + 1));
            } else if a == 0 {
                zer.insert((a, l + 1));
            } else {
                pos.insert((a, l + 1));
            }
        }

        for r in l + 2..=N {
            // [l, r) は ok か?
            let mut cand = std::collections::BTreeSet::new();

            let n1 = neg.range(..).next();

            match n1 {
                Some(&(v, i)) => {
                    cand.insert((v, i));

                    let n2 = neg.range((v, i + 1)..).next();

                    match n2 {
                        Some(&(v2, i2)) => {
                            cand.insert((v2, i2));
                        }
                        None => {}
                    }
                }
                None => {}
            }

            let nn1 = neg.range(..).next_back();

            match nn1 {
                Some(&(v, i)) => {
                    cand.insert((v, i));

                    let n2 = neg.range(..(v, i)).next_back();

                    match n2 {
                        Some(&(v2, i2)) => {
                            cand.insert((v2, i2));
                        }
                        None => {}
                    }
                }
                None => {}
            }

            let z1 = zer.range(..).next();

            match z1 {
                Some(&(v, i)) => {
                    cand.insert((v, i));

                    let n2 = zer.range((v, i + 1)..).next();

                    match n2 {
                        Some(&(v2, i2)) => {
                            cand.insert((v2, i2));
                        }
                        None => {}
                    }
                }
                None => {}
            }

            let p1 = pos.range(..).next();

            match p1 {
                Some(&(v, i)) => {
                    cand.insert((v, i));

                    let n2 = pos.range((v, i + 1)..).next();

                    match n2 {
                        Some(&(v2, i2)) => {
                            cand.insert((v2, i2));
                        }
                        None => {}
                    }
                }
                None => {}
            }

            let pp1 = pos.range(..).next_back();

            match pp1 {
                Some(&(v, i)) => {
                    cand.insert((v, i));

                    let n2 = pos.range(..(v, i)).next_back();

                    match n2 {
                        Some(&(v2, i2)) => {
                            cand.insert((v2, i2));
                        }
                        None => {}
                    }
                }
                None => {}
            }

            let C = cand.iter().map(|&(k, _)| k).collect::<Vec<_>>();

            let mut D = vec![];

            let length = C.len();

            for i in 0..length {
                for j in i + 1..length {
                    D.push(C[i] * C[j]);
                }
            }

            // eprintln!(
            //     "{}",
            //     C.iter()
            //         .map(|x| x.to_string())
            //         .collect::<Vec<_>>()
            //         .join(" ")
            // );

            D.sort();

            let l2 = D.len();
            let m = D[0];
            let M = D[l2 - 1];

            if L <= m && R >= M {
                ans = std::cmp::max(ans, r - l);
            }

            // A[r]を追加する.
            if r != N {
                let a = A[r];
                if a < 0 {
                    neg.insert((a, r));
                } else if a == 0 {
                    zer.insert((a, r));
                } else {
                    pos.insert((a, r));
                }
            }
        }

        // A[l] を削除する
        let a = A[l];
        if a < 0 {
            neg.remove(&(a, l));
        } else if a == 0 {
            zer.remove(&(a, l));
        } else {
            pos.remove(&(a, l));
        }
    }

    writeln!(out, "{}", ans);
}

struct Scanner<R> {
    reader: R,
    buf_str: Vec<u8>,
    buf_iter: str::SplitWhitespace<'static>,
}
impl<R: BufRead> Scanner<R> {
    fn new(reader: R) -> Self {
        Self {
            reader,
            buf_str: vec![],
            buf_iter: "".split_whitespace(),
        }
    }
    fn token<T: str::FromStr>(&mut self) -> T {
        loop {
            if let Some(token) = self.buf_iter.next() {
                return token.parse().ok().expect("Failed parse");
            }
            self.buf_str.clear();
            self.reader
                .read_until(b'\n', &mut self.buf_str)
                .expect("Failed read");
            self.buf_iter = unsafe {
                let slice = str::from_utf8_unchecked(&self.buf_str);
                std::mem::transmute(slice.split_whitespace())
            }
        }
    }
}