結果

問題 No.742 にゃんにゃんにゃん　猫の挨拶
ユーザー phspls
提出日時 2022-12-04 17:22:46
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 17 ms / 2,500 ms
コード長 2,532 bytes
コンパイル時間 13,437 ms
コンパイル使用メモリ 376,916 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-10-11 20:04:11
合計ジャッジ時間 14,563 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge1
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
other AC * 16
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: field `orgn` is never read
 --> src/main.rs:5:5
  |
3 | struct SegmentTree<F, T> {
  |        ----------- field in this struct
4 |     n: usize,
5 |     orgn: usize,
  |     ^^^^
  |
  = note: `SegmentTree` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
  = note: `#[warn(dead_code)]` on by default

ソースコード

diff #
プレゼンテーションモードにする

#[derive(Debug, Clone)]
struct SegmentTree<F, T> {
    n: usize,
    orgn: usize,
    unit: T,
    mem: Vec<T>,
    operator: F
}
impl<F, T> SegmentTree<F, T> where
T: std::fmt::Debug + Copy,
F: Fn(T, T) -> T
{
    fn new(n: usize, unit: T, operator: F) -> Self {
        let mut size = 1usize;
        while size < n { size *= 2; }
        Self {
            n: size,
            orgn: n,
            unit: unit,
            mem: vec![unit; size*2-1],
            operator: operator,
        }
    }
    fn find_closed(&self, l: usize, r: usize) -> T {
        self.find(l, r+1)
    }
    fn find(&self, l: usize, r: usize) -> T {
        self._find(l, r, 0, 0, self.n)
    }
    fn set(&mut self, pos: usize, val: T) {
        let mut pos = pos + self.n - 1;
        self.mem[pos] = val;
        while pos > 0 {
            pos = self._parent(pos);
            self.mem[pos] = (self.operator)(self.mem[self._left(pos)], self.mem[self._right(pos)]);
        }
    }
    fn get(&mut self, pos: usize) -> T {
        self.mem[pos + self.n - 1]
    }
    fn _find(&self, a: usize, b: usize, nodenum: usize, l: usize, r: usize) -> T {
        if r <= a || b <= l {
            return self.unit;
        } else if a <= l && r <= b {
            return self.mem[nodenum];
        }
        let left = self._find(a, b, self._left(nodenum), l, (l+r)/2);
        let right = self._find(a, b, self._right(nodenum), (l+r)/2, r);
        (self.operator)(left, right)
    }
    fn _left(&self, k: usize) -> usize {
        2*k+1
    }
    fn _right(&self, k: usize) -> usize {
        2*k+2
    }
    fn _parent(&self, k: usize) -> usize {
        (k-1)/2
    }
}
fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let ms = (0..n).map(|_| {
            let mut temp = String::new();
            std::io::stdin().read_line(&mut temp).ok();
            let temp: usize = temp.trim().parse().unwrap();
            temp-1
        })
        .collect::<Vec<_>>();
    let mut result = 0usize;
    let mut segtree = SegmentTree::new(n, 0usize, |x, y| x + y);
    for i in 0..n {
        result += segtree.find(ms[i], n);
        let val = segtree.get(ms[i]);
        segtree.set(ms[i], val+1);
    }
    let mut segtree = SegmentTree::new(n, 0usize, |x, y| x + y);
    for i in (0..n).rev() {
        result += segtree.find_closed(0, ms[i]);
        let val = segtree.get(ms[i]);
        segtree.set(ms[i], val+1);
    }
    println!("{}", result / 2);
}
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