結果

問題 No.482 あなたの名は
ユーザー koba-e964
提出日時 2017-02-10 22:40:45
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 165 ms / 2,000 ms
コード長 3,897 bytes
コンパイル時間 17,637 ms
コンパイル使用メモリ 389,424 KB
実行使用メモリ 8,384 KB
最終ジャッジ日時 2024-12-29 20:15:44
合計ジャッジ時間 19,825 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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ファイルパターン 結果
sample AC * 3
other AC * 28
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: method `is_same_set` is never used
   --> src/main.rs:108:8
    |
87  | impl UnionFind {
    | -------------- method in this implementation
...
108 |     fn is_same_set(self: &mut Self, x: usize, y: usize) -> bool {
    |        ^^^^^^^^^^^
    |
    = note: `#[warn(dead_code)]` on by default

ソースコード

diff #
プレゼンテーションモードにする

#[allow(unused_imports)]
use std::cmp::*;
#[allow(unused_imports)]
use std::collections::*;
use std::io::*;
#[allow(dead_code)]
fn getline() -> String {
    let mut ret = String::new();
    std::io::stdin().read_line(&mut ret).ok();
    return ret;
}
fn get_word() -> String {
    let mut stdin = std::io::stdin();
    let mut u8b: [u8; 1] = [0];
    loop {
        let mut buf: Vec<u8> = Vec::with_capacity(16);
        loop {
            let res = stdin.read(&mut u8b);
            if res.unwrap_or(0) == 0 || u8b[0] <= b' ' {
                break;
            } else {
                buf.push(u8b[0]);
            }
        }
        if buf.len() >= 1 {
            let ret = std::string::String::from_utf8(buf).unwrap();
            return ret;
        }
    }
}
fn parse<T: std::str::FromStr>(s: &str) -> T { s.parse::<T>().ok().unwrap() }
#[allow(dead_code)]
fn get<T: std::str::FromStr>() -> T { parse(&get_word()) }
/**
 * Segment Tree. This data structure is useful for fast folding on intervals of an array
 * whose elements are elements of monoid M. Note that constructing this tree requires the identity
 * element of M and the operation of M.
 * Verified by: yukicoder No. 259 (http://yukicoder.me/submissions/100581)
 */
struct SegTree<I, BiOp> {
    n: usize,
    dat: Vec<I>,
    op: BiOp,
    e: I,
}
impl<I, BiOp> SegTree<I, BiOp>
    where BiOp: Fn(I, I) -> I,
          I: Copy {
    pub fn new(n_: usize, op: BiOp, e: I) -> Self {
        let mut n = 1;
        while n < n_ { n *= 2; } // n is a power of 2
        SegTree {n: n, dat: vec![e; 2 * n - 1], op: op, e: e}
    }
    /* ary[k] <- v */
    pub fn update(&mut self, idx: usize, v: I) {
        let mut k = idx + self.n - 1;
        self.dat[k] = v;
        while k > 0 {
            k = (k - 1) / 2;
            self.dat[k] = (self.op)(self.dat[2 * k + 1], self.dat[2 * k + 2]);
        }
    }
    /* l,r are for simplicity */
    fn query_sub(&self, a: usize, b: usize, k: usize, l: usize, r: usize) -> I {
        // [a,b) and  [l,r) intersects?
        if r <= a || b <= l { return self.e; }
        if a <= l && r <= b { return self.dat[k]; }
        let vl = self.query_sub(a, b, 2 * k + 1, l, (l + r) / 2);
        let vr = self.query_sub(a, b, 2 * k + 2, (l + r) / 2, r);
        (self.op)(vl, vr)
    }
    /* [a, b] (note: inclusive) */
    pub fn query(&self, a: usize, b: usize) -> I {
        self.query_sub(a, b + 1, 0, 0, self.n)
    }
}
/**
 * Union-Find tree.
 * Verified by yukicoder No.94 (http://yukicoder.me/submissions/82111)
 */
struct UnionFind { disj: Vec<usize> }
impl UnionFind {
    fn new(n: usize) -> Self {
        let mut disj = vec![0; n];
        for i in 0 .. n {
            disj[i] = i;
        }
        UnionFind { disj: disj }
    }
    fn root(self: &mut Self, x: usize) -> usize {
        if x != self.disj[x] {
            let par = self.disj[x];
            let r = self.root(par);
            self.disj[x] = r;
        }
        return self.disj[x];
    }
    fn unite(self: &mut Self, x: usize, y: usize) {
        let xr = self.root(x);
        let yr = self.root(y);
        self.disj[xr] = yr;
    }
    fn is_same_set(self: &mut Self, x: usize, y: usize) -> bool {
        return self.root(x) == self.root(y);
    }
}
fn main() {
    let n = get();
    let k: i64 = get();
    let d: Vec<usize> = (0 .. n).map(|_| get::<usize>()).collect();
    let mut st = SegTree::new(n + 1, |x, y| x + y, 0i64);
    let mut uf = UnionFind::new(n);
    let mut inv: i64 = 0;
    let mut derange = 0;
    for i in 0 .. n {
        inv += st.query(d[i] + 1, n);
        let tmp = st.query(d[i], d[i]);
        st.update(d[i], tmp + 1);
        uf.unite(i, d[i] - 1);
    }
    inv %= 2;
    for i in 0 .. n {
        if uf.root(i) != i {
            derange += 1;
        }
    }
    println!("{}", if (k + inv) % 2 == 0 && derange as i64 <= k { "YES" } else { "NO" });
}
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