結果

問題 No.1641 Tree Xor Query
コンテスト
ユーザー phspls
提出日時 2022-10-24 23:57:26
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 233 ms / 5,000 ms
コード長 3,599 bytes
コンパイル時間 15,889 ms
コンパイル使用メモリ 406,504 KB
実行使用メモリ 24,660 KB
最終ジャッジ日時 2024-07-03 02:29:08
合計ジャッジ時間 16,084 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge3
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ファイルパターン 結果
sample AC * 3
other AC * 18
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:6:5
  |
4 | struct SegmentTree<F, T> {
  |        ----------- field in this struct
5 |     n: usize,
6 |     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 `find_closed` is never used
  --> src/main.rs:28:8
   |
12 | / impl<F, T> SegmentTree<F, T> where
13 | | T: std::fmt::Debug + Copy,
14 | | F: Fn(T, T) -> T
   | |________________- method in this implementation
...
28 |       fn find_closed(&self, l: usize, r: 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 + 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 dfs(cur: usize, prev: usize, idx: &mut usize, paths: &Vec<Vec<usize>>, starts: &mut Vec<usize>, ends: &mut Vec<usize>) {
    starts[cur] = *idx;
    *idx += 1;
    for &v in paths[cur].iter() {
        if v == prev { continue; }
        dfs(v, cur, idx, paths, starts, ends);
    }
    ends[cur] = *idx;
    *idx += 1;
}

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 c = String::new();
    std::io::stdin().read_line(&mut c).ok();
    let c: Vec<usize> = c.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let mut paths = vec![vec![]; n];
    for _ in 0..n-1 {
        let mut ab = String::new();
        std::io::stdin().read_line(&mut ab).ok();
        let ab: Vec<usize> = ab.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        let a = ab[0]-1;
        let b = ab[1]-1;
        paths[a].push(b);
        paths[b].push(a);
    }
    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], temp[1], temp[2])
        })
        .collect::<Vec<_>>();

    let mut starts = vec![0usize; n];
    let mut ends = vec![0usize; n];
    let mut idx = 0usize;
    dfs(0, 0, &mut idx, &paths, &mut starts, &mut ends);
    let mut segtree = SegmentTree::new(2*n, 0usize, |x, y| x ^ y);
    for i in 0..n {
        segtree.set(starts[i], c[i]);
    }
    for &(t, x, y) in queries.iter() {
        let x = x-1;
        if t == 1 {
            let val = segtree.get(starts[x]);
            segtree.set(starts[x], val ^ y);
        } else {
            println!("{}", segtree.find(starts[x], ends[x]));
        }
    }
}
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