結果

問題 No.1471 Sort Queries
コンテスト
ユーザー phspls
提出日時 2022-11-05 22:16:32
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 897 ms / 2,000 ms
コード長 3,276 bytes
コンパイル時間 16,247 ms
コンパイル使用メモリ 399,996 KB
実行使用メモリ 5,376 KB
最終ジャッジ日時 2024-07-19 15:32:20
合計ジャッジ時間 21,938 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge3
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 * 3
other AC * 37
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

warning: method `get` is never used
  --> src/main.rs:44:8
   |
11 | / impl<F, T> SegmentTree<F, T> where
12 | | T: std::fmt::Debug + Clone,
13 | | F: Fn(&T, &T) -> T
   | |__________________- method in this implementation
...
44 |       fn get(&mut self, pos: usize) -> &T {
   |          ^^^

ソースコード

diff # 

#[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 + Clone,
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.clone(),
            mem: vec![unit.clone().to_owned(); 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)]).clone().to_owned();
        }
    }

    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.clone();
        } else if a <= l && r <= b {
            return self.mem[nodenum].clone();
        }
        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 nq = String::new();
    std::io::stdin().read_line(&mut nq).ok();
    let nq: Vec<usize> = nq.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nq[0];
    let q = nq[1];
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s = s.trim().chars().collect::<Vec<_>>();
    let queries = (0..q).map(|_| {
            let mut temp = String::new();
            std::io::stdin().read_line(&mut temp).ok();
            let temp: Vec<usize> = temp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
            (temp[0]-1, temp[1]-1, temp[2]-1)
        })
        .collect::<Vec<_>>();

    let operator = |x: &Vec<char>, y: &Vec<char>| {
        let n = x.len();
        let m = y.len();
        let mut ret = Vec::with_capacity(n+m);
        let mut xidx = 0usize;
        let mut yidx = 0usize;
        while xidx < n && yidx < m {
            if x[xidx] > y[yidx] {
                ret.push(y[yidx]);
                yidx += 1;
            } else {
                ret.push(x[xidx]);
                xidx += 1;
            }
        }
        while xidx < n {
            ret.push(x[xidx]);
            xidx += 1;
        }
        while yidx < m {
            ret.push(y[yidx]);
            yidx += 1;
        }
        ret
    };
    let mut segtree = SegmentTree::new(n, vec![], operator);
    for i in 0..n {
        segtree.set(i, vec![s[i]]);
    }
    for &(l, r, x) in queries.iter() {
        println!("{}", segtree.find_closed(l, r)[x]);
    }
}
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