Submission #1492247

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Source Code Expand

fn get_line() -> String {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().to_string()
}

fn reads<T>() -> Vec<T>
    where
        T: std::str::FromStr,
        <T as std::str::FromStr>::Err: std::fmt::Debug {
    get_line().split(' ').map(|x| x.parse().unwrap()).collect()
}

fn readln<T>() -> T
    where
        T: std::str::FromStr,
        <T as std::str::FromStr>::Err: std::fmt::Debug {
    get_line().parse().unwrap()
}

#[derive(Clone, Copy, Eq, PartialEq, Debug)]
enum E {
    Answer(u64),
    Less(u64),
}

use std::cmp;

fn main() {
    let n = readln();
    let xs = reads();
    let ys = reads();

    let mut zs = vec![E::Less(1000000000); n];

    let mut prev = 0;
    for (i, x) in xs.into_iter().enumerate() {
        if x > prev {
            prev = x;
            zs[i] = E::Answer(x);
        }
        else {
            zs[i] = E::Less(x);
        }
    }

    let mut prev = 0;
    let mut flag = true;
    for i in 0..n {
        let i = n - i - 1;
        let y = ys[i];

        if !flag {
            break;
        }

        if y > prev {
            prev = y;

            match zs[i] {
                E::Answer(n) if n == y => {},
                E::Less(n) if n >= y => {zs[i] = E::Answer(y);},
                _ => {flag = false;},
            }
        }
        else {
            match zs[i] {
                E::Answer(n) if y >= n => {},
                E::Less(n) => {zs[i] = E::Less(cmp::min(n, y));},
                _ =>  {flag = false;},
            }
        }
    }

    let mut res = 0;
    if flag {
        res = 1;
        for z in zs {
            if let E::Less(n) = z {
                res *= n;
                res %= 1000000007;
            }
        }
    }

    println!("{}", res);
}

Submission Info

Judge Result