結果

問題 No.1868 Teleporting Cyanmond
ユーザー phsplsphspls
提出日時 2022-09-25 15:41:11
言語 Rust
(1.77.0 + proconio)
結果
AC  
実行時間 37 ms / 2,000 ms
コード長 2,292 bytes
コンパイル時間 10,896 ms
コンパイル使用メモリ 406,632 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-06-01 22:20:28
合計ジャッジ時間 12,559 ms
ジャッジサーバーID
(参考情報)
judge4 / judge2
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 1 ms
6,816 KB
testcase_01 AC 1 ms
6,820 KB
testcase_02 AC 1 ms
6,816 KB
testcase_03 AC 37 ms
6,816 KB
testcase_04 AC 25 ms
6,940 KB
testcase_05 AC 2 ms
6,940 KB
testcase_06 AC 6 ms
6,940 KB
testcase_07 AC 17 ms
6,944 KB
testcase_08 AC 10 ms
6,940 KB
testcase_09 AC 15 ms
6,940 KB
testcase_10 AC 34 ms
6,940 KB
testcase_11 AC 1 ms
6,944 KB
testcase_12 AC 8 ms
6,944 KB
testcase_13 AC 14 ms
6,940 KB
testcase_14 AC 28 ms
6,940 KB
testcase_15 AC 18 ms
6,940 KB
testcase_16 AC 4 ms
6,944 KB
testcase_17 AC 6 ms
6,944 KB
testcase_18 AC 27 ms
6,940 KB
testcase_19 AC 27 ms
6,944 KB
testcase_20 AC 27 ms
6,944 KB
testcase_21 AC 27 ms
6,940 KB
testcase_22 AC 26 ms
6,940 KB
testcase_23 AC 25 ms
6,940 KB
testcase_24 AC 26 ms
6,940 KB
testcase_25 AC 26 ms
6,940 KB
testcase_26 AC 26 ms
6,940 KB
testcase_27 AC 27 ms
6,940 KB
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:7:5
  |
5 | struct SegmentTree<F, T> {
  |        ----------- field in this struct
6 |     n: usize,
7 |     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:46:8
   |
13 | / impl<F, T> SegmentTree<F, T> where
14 | | T: std::fmt::Debug + Copy,
15 | | F: Fn(T, T) -> T
   | |________________- method in this implementation
...
46 |       fn get(&mut self, pos: usize) -> T {
   |          ^^^

ソースコード

diff #

const INF: usize = 1usize << 60;

#[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 mut r = String::new();
    std::io::stdin().read_line(&mut r).ok();
    let r: Vec<usize> = r.trim().split_whitespace().map(|s| s.parse::<usize>().unwrap()-1).collect();

    let mut dp = vec![INF; n];
    let mut segtree = SegmentTree::new(n, INF, |x, y| x.min(y));
    dp[n-1] = 0;
    segtree.set(n-1, 0);
    for i in (0..n-1).rev() {
        dp[i] = 1 + segtree.find_closed(i+1, r[i]);
        segtree.set(i, dp[i]);
    }
    println!("{}", dp[0]);
}
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