結果

問題 No.1435 Mmm......
ユーザー phsplsphspls
提出日時 2022-11-20 16:16:11
言語 Rust
(1.77.0)
結果
AC  
実行時間 424 ms / 2,000 ms
コード長 2,728 bytes
コンパイル時間 1,298 ms
コンパイル使用メモリ 186,276 KB
実行使用メモリ 17,640 KB
最終ジャッジ日時 2023-10-21 14:24:49
合計ジャッジ時間 12,577 ms
ジャッジサーバーID
（参考情報） 		judge13 / judge11
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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
4,348 KB
testcase_01 AC 1 ms
4,348 KB
testcase_02 AC 1 ms
4,348 KB
testcase_03 AC 0 ms
4,348 KB
testcase_04 AC 0 ms
4,348 KB
testcase_05 AC 1 ms
4,348 KB
testcase_06 AC 270 ms
15,692 KB
testcase_07 AC 333 ms
16,064 KB
testcase_08 AC 387 ms
16,428 KB
testcase_09 AC 366 ms
16,372 KB
testcase_10 AC 306 ms
16,020 KB
testcase_11 AC 305 ms
16,012 KB
testcase_12 AC 281 ms
15,972 KB
testcase_13 AC 287 ms
15,696 KB
testcase_14 AC 195 ms
9,188 KB
testcase_15 AC 397 ms
16,456 KB
testcase_16 AC 327 ms
16,064 KB
testcase_17 AC 217 ms
9,504 KB
testcase_18 AC 399 ms
16,464 KB
testcase_19 AC 300 ms
16,000 KB
testcase_20 AC 368 ms
16,400 KB
testcase_21 AC 306 ms
17,468 KB
testcase_22 AC 385 ms
16,100 KB
testcase_23 AC 398 ms
17,640 KB
testcase_24 AC 407 ms
17,640 KB
testcase_25 AC 424 ms
17,640 KB
testcase_26 AC 407 ms
17,640 KB
testcase_27 AC 403 ms
17,640 KB
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コンパイルメッセージ
warning: field `orgn` is never read
 --> 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: methods `find_closed` and `get` are never used
  --> Main.rs:29:8
   |
13 | impl<F, T> SegmentTree<F, T> where
   | ---------------------------- methods in this implementation
...
29 |     fn find_closed(&self, l: usize, r: usize) -> T {
   |        ^^^^^^^^^^^
...
46 |     fn get(&mut self, pos: usize) -> T {
   |        ^^^

warning: variable `UNIT` should have a snake case name
  --> Main.rs:79:9
   |
79 |     let UNIT = (INF, INF, -INF);
   |         ^^^^ help: convert the identifier to snake case: `unit`
   |
   = note: `#[warn(non_snake_case)]` on by default

warning: variable `M` should have a snake case name
  --> Main.rs:94:26
   |
94 |             let (m1, m2, M) = segtree.find(i, idx);
   |                          ^ help: convert the identifier to snake case: `m`

warning: 4 warnings emitted

ソースコード

diff # 

const INF: isize = 1isize << 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 a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: Vec<isize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let UNIT = (INF, INF, -INF);
    let operator = |(lmin1, lmin2, lmax): (isize, isize, isize), (rmin1, rmin2, rmax): (isize, isize, isize)| {
        let mut mins = vec![lmin1, lmin2, rmin1, rmin2];
        mins.sort();
        (mins[0], mins[1], lmax.max(rmax))
    };
    let mut segtree = SegmentTree::new(n, UNIT, operator);
    for i in 0..n {
        segtree.set(i, (a[i], INF, a[i]));
    }
    let mut result = 0usize;
    let mut idx = n;
    for i in (0..n).rev() {
        if idx - i < 2 { continue; }
        while idx - i >= 2 {
            let (m1, m2, M) = segtree.find(i, idx);
            if M <= m1+m2 { break; }
            idx -= 1;
        }
        result += idx - i - 1;
    }
    println!("{}", result);
}
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