結果

問題 No.1106 🦉 何事もバランスが大事
ユーザー akakimidoriakakimidori
提出日時 2020-07-03 23:16:05
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 3 ms / 2,000 ms
コード長 3,587 bytes
コンパイル時間 12,370 ms
コンパイル使用メモリ 403,028 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-09-17 04:54:33
合計ジャッジ時間 14,609 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge4
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 * 5
other AC * 77
権限があれば一括ダウンロードができます
コンパイルメッセージ
warning: function `print` is never used
  --> src/main.rs:51:4
   |
51 | fn print(n: i32) {
   |    ^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: function `test` is never used
  --> src/main.rs:61:4
   |
61 | fn test() {
   |    ^^^^

ソースコード

diff # 

//https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8 より
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

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

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

//

fn print(n: i32) {
    print!("{}: ", n);
    let mut n = n;
    while n > 0 {
        print!(" {}", n % 5);
        n /= 5;
    }
    println!();
}

fn test() {
    let n = 1000;
    for i in 1..=n {
        let mut diff = 0i32;
        let mut left = i;
        let mut right = 0;
        let mut weight = 1;
        while left != right {
            let l = left / weight % 5;
            let r = right / weight % 5;
            if l < r {
                if l + 2 >= r {
                    left += weight * (r - l);
                    diff += r - l;
                } else {
                    assert!(l + 5 - r <= 2);
                    right += weight * (l + 5 - r);
                    diff -= l + 5 - r;
                }
            } else if l > r {
                if r + 2 >= l {
                    right += weight * (l - r);
                    diff -= l - r;
                } else {
                    assert!(r + 5 - l <= 2);
                    left += weight * (r + 5 - l);
                    diff += r + 5 - l;
                }
            }
            weight *= 5;
        }
        if diff == 0 {
            print(i);
        }
    }
}

fn run() {
    input! {
        n: i64,
    }
    let mut d = vec![];
    let mut p = n;
    while p > 0 {
        d.push(p % 5);
        p /= 5;
    }
    d.push(0);
    // 差分、carry, small = way
    type Map = std::collections::BTreeMap<(i64, bool, bool), i64>;
    let mut dp = Map::new();
    dp.insert((0, false, true), 1);
    for &d in d.iter() {
        let mut next = Map::new();
        for ((diff, carry, small), cnt) in dp {
            for i in 0..5i64 {
                let v = i + carry as i64;
                let diff = if v < 3 {
                    diff + v
                } else {
                    diff - (5 - v)
                };
                let carry = v >= 3;
                let small = i < d || (i == d && small);
                *next.entry((diff, carry, small)).or_insert(0) += cnt;
            }
        }
        dp = next;
    }
    let mut ans = -1;
    for ((diff, carry, small), cnt) in dp {
        if diff == 0 && !carry && small {
            ans += cnt;
        }
    }
    println!("{}", ans);
}

fn main() {
//    test();
    run();
}
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