結果

問題 No.694 square1001 and Permutation 3
コンテスト
ユーザー phspls
提出日時 2023-01-08 23:27:21
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 1,324 ms / 3,000 ms
コード長 3,268 bytes
コンパイル時間 13,393 ms
コンパイル使用メモリ 377,844 KB
実行使用メモリ 25,472 KB
最終ジャッジ日時 2024-12-16 03:32:34
合計ジャッジ時間 24,065 ms
ジャッジサーバーID
（参考情報） 		judge2 / 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 * 1
other AC * 13
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:33:5
   |
31 | struct SegmentTree<F, T> {
   |        ----------- field in this struct
32 |     n: usize,
33 |     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

warning: methods `find_closed` and `get` are never used
  --> src/main.rs:55:8
   |
39 | / impl<F, T> SegmentTree<F, T> where
40 | | T: std::fmt::Debug + Copy,
41 | | F: Fn(T, T) -> T
   | |________________- methods in this implementation
...
55 |       fn find_closed(&self, l: usize, r: usize) -> T {
   |          ^^^^^^^^^^^
...
72 |       fn get(&mut self, pos: usize) -> T {
   |          ^^^

ソースコード

diff # 

fn lower_bound(target: usize, vals: &Vec<usize>) -> usize {
    let mut upper = vals.len();
    let mut lower = 0usize;
    while upper > lower {
        let middle = (upper + lower) / 2;
        if vals[middle] < target {
            lower = middle+1;
        } else {
            upper = middle;
        }
    }
    upper
}

fn upper_bound(target: usize, vals: &Vec<usize>) -> usize {
    let mut upper = vals.len();
    let mut lower = 0usize;
    while upper > lower {
        let middle = (upper + lower) / 2;
        if vals[middle] <= target {
            lower = middle+1;
        } else {
            upper = middle;
        }
    }
    upper
}

#[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 a = (0..n).map(|_| {
            let mut a = String::new();
            std::io::stdin().read_line(&mut a).ok();
            let a: usize = a.trim().parse().unwrap();
            a
        })
        .collect::<Vec<_>>();

    let mut segtree = SegmentTree::new(n, 0usize, |x, y| x + y);
    let mut order = (0..n).collect::<Vec<_>>();
    order.sort_by_key(|&i| (a[i], i));
    let mut result = vec![0usize; n];
    for &i in order.iter() {
        result[0] += segtree.find(i, n);
        segtree.set(i, 1);
    }
    let sorted = order.iter().map(|&i| a[i]).collect::<Vec<_>>();
    for i in 1..n {
        result[i] = result[i-1];
        result[i] += n - upper_bound(a[i-1], &sorted);
        result[i] -= lower_bound(a[i-1], &sorted);
    }
    for &v in result.iter() {
        println!("{}", v);
    }
}
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