Submission #3237068

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Source Code Expand

#[allow(unused_macros)]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        let mut next = || { iter.next().unwrap() };
        input_inner!{next, $($r)*}
    };
    ($($r:tt)*) => {
        let stdin = std::io::stdin();
        let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
        let mut next = move || -> String{
            bytes
                .by_ref()
                .map(|r|r.unwrap() as char)
                .skip_while(|c|c.is_whitespace())
                .take_while(|c|!c.is_whitespace())
                .collect()
        };
        input_inner!{next, $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! input_inner {
    ($next:expr) => {};
    ($next:expr, ) => {};

    ($next:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($next, $t);
        input_inner!{$next $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! read_value {
    ($next:expr, ( $($t:tt),* )) => {
        ( $(read_value!($next, $t)),* )
    };

    ($next:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
    };

    ($next:expr, chars) => {
        read_value!($next, String).chars().collect::<Vec<char>>()
    };

    ($next:expr, usize1) => {
        read_value!($next, usize) - 1
    };

    ($next:expr, $t:ty) => {
        $next().parse::<$t>().expect("Parse error")
    };
}

#[allow(unused_imports)]
use std::cmp;

fn main() {
    input!{
        n: usize,
        a: [usize; n],
    }

    // println!("{:?}", a.iter().enumerate().max_by_key(|(_, &v)| v % 3).unwrap());
    let mut a = a;
    let mut alice = 0;
    let mut bob = 0;
    for i in 1..n+1 {
        let mi = a.iter().enumerate().max_by_key(|(_, &v)| v).unwrap().0;

        if i % 2 == 1 {
            alice += a[mi];
        } else {
            bob += a[mi];
        }
        a[mi] = 0;
    }
    println!("{}", (alice - bob) as i32);
}

Submission Info

Compile Error

error[E0308]: mismatched types
  --> ./Main.rs:71:51
   |
71 |         let mi = a.iter().enumerate().max_by_key(|(_, &v)| v).unwrap().0;
   |                                                   ^^^^^^^ expected reference, found tuple
   |
   = note: expected type `&(usize, &usize)`
   = note:    found type `(_, _)`

error: aborting due to previous error