#686591 (Rust) No.1639 最小通信路

提出ソース

結果

問題	No.1639 最小通信路
コンテスト
ユーザー	Moss_Local
提出日時	2021-08-06 22:03:53
言語	Rust (1.83.0 + proconio)
結果	WA
実行時間	-
コード長	10,348 bytes
コンパイル時間	13,585 ms
コンパイル使用メモリ	388,488 KB
実行使用メモリ	6,948 KB
最終ジャッジ日時	2024-09-17 02:02:24
合計ジャッジ時間	15,106 ms
ジャッジサーバーID （参考情報）	judge6 / judge1

このコードへのチャレンジ
（要ログイン）

ファイルパターン	結果
sample	AC * 2
other	AC * 21 WA * 22

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: unnecessary parentheses around type
   --> src/main.rs:119:15
    |
119 | fn readi() -> (i64) {
    |               ^   ^
    |
    = note: `#[warn(unused_parens)]` on by default
help: remove these parentheses
    |
119 - fn readi() -> (i64) {
119 + fn readi() -> i64 {
    |

warning: unused variable: `x`
   --> src/main.rs:330:17
    |
330 |         let mut x = 0 as usize;
    |                 ^ help: if this is intentional, prefix it with an underscore: `_x`
    |
    = note: `#[warn(unused_variables)]` on by default

warning: variable does not need to be mutable
   --> src/main.rs:330:13
    |
330 |         let mut x = 0 as usize;
    |             ----^
    |             |
    |             help: remove this `mut`
    |
    = note: `#[warn(unused_mut)]` on by default

warning: variable does not need to be mutable
   --> src/main.rs:333:17
    |
333 |             let mut e = Edge {
    |                 ----^
    |                 |
    |                 help: remove this `mut`

warning: unused variable: `i`
   --> src/main.rs:381:9
    |
381 |     for i in 0..n * (n - 1) / 2 {
    |         ^ help: if this is intentional, prefix it with an underscore: `_i`

warning: variable does not need to be mutable
   --> src/main.rs:387:13
    |
387 |         let mut c: f64 = s.next().unwrap().parse().unwrap();
    |             ----^
    |             |
    |             help: remove this `mut`

ソースコード

raw source code

// -*- coding:utf-8-unix -*-
// #![feature(map_first_last)]
#![allow(dead_code)]
#![allow(unused_imports)]
#![allow(unused_macros)]
use std::collections::*;
use std::convert::*;
use std::convert::{From, Into};
use std::fmt::Debug;
use std::fs::File;
use std::io::prelude::*;
use std::io::*;
use std::marker::Copy;
use std::mem::*;
use std::ops::Bound::*;
use std::ops::{Add, Mul, Neg, Sub};
use std::str;
use std::vec;
use std::{cmp, process::Output};
use std::{cmp::Ordering, env::consts::DLL_PREFIX};
use std::{cmp::Ordering::*, f32::consts::PI};
const INF: i64 = 1223372036854775807;
const UINF: usize = INF as usize;
const FINF: f64 = 122337203685.0;
const INF128: i128 = 1223372036854775807000000000000;
const LINF: i64 = 2147483647;
const MOD: i64 = 1000000007;
// const MOD: i64 = 998244353;
const T: bool = true;
const F: bool = false;

const MPI: f64 = 3.14159265358979323846264338327950288f64;
// const MOD: i64 = INF;

const UMOD: usize = MOD as usize;
use std::cmp::*;
use std::collections::*;
use std::io::stdin;
use std::io::stdout;
use std::io::Write;

use crate::kraskal::kraskal;

macro_rules! p {
    ($x:expr) => {
        println!("{}", $x);
    };
}
macro_rules! d {
    ($x:expr) => {
        println!("{:?}", $x);
    };
}
macro_rules! dd {
    (x:expr) => {
        dbg!(x);
    };
}

macro_rules! chmin {
    ($base:expr, $($cmps:expr),+ $(,)*) => {{
        let cmp_min = min!($($cmps),+);
        if $base > cmp_min {
            $base = cmp_min;
            true
        } else {
            false
        }
    }};
}

macro_rules! chmax {
    ($base:expr, $($cmps:expr),+ $(,)*) => {{
        let cmp_max = max!($($cmps),+);
        if $base < cmp_max {
            $base = cmp_max;
            true
        } else {
            false
        }
    }};
}

macro_rules! min {
    ($a:expr $(,)*) => {{
        $a
    }};
    ($a:expr, $b:expr $(,)*) => {{
        std::cmp::min($a, $b)
    }};
    ($a:expr, $($rest:expr),+ $(,)*) => {{
        std::cmp::min($a, min!($($rest),+))
    }};
}

macro_rules! max {
    ($a:expr $(,)*) => {{
        $a
    }};
    ($a:expr, $b:expr $(,)*) => {{
        std::cmp::max($a, $b)
    }};
    ($a:expr, $($rest:expr),+ $(,)*) => {{
        std::cmp::max($a, max!($($rest),+))
    }};
}

// use str::Chars;

// use str::Chars;
#[allow(dead_code)]
fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

#[allow(dead_code)]
fn readi() -> (i64) {
    let mut str = String::new();
    let _ = stdin().read_line(&mut str).unwrap();
    let mut iter = str.split_whitespace();
    iter.next().unwrap().parse::<i64>().unwrap()
}

#[allow(dead_code)]
fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}
#[allow(dead_code)]
fn read_vec2<T: std::str::FromStr>(n: u32) -> Vec<Vec<T>> {
    (0..n).map(|_| read_vec()).collect()
}

#[allow(dead_code)]
fn readii() -> (i64, i64) {
    let mut str = String::new();
    let _ = stdin().read_line(&mut str).unwrap();
    let mut iter = str.split_whitespace();
    (
        iter.next().unwrap().parse::<i64>().unwrap(),
        iter.next().unwrap().parse::<i64>().unwrap(),
    )
}

fn readff() -> (f64, f64) {
    let mut str = String::new();
    let _ = stdin().read_line(&mut str).unwrap();
    let mut iter = str.split_whitespace();
    (
        iter.next().unwrap().parse::<f64>().unwrap(),
        iter.next().unwrap().parse::<f64>().unwrap(),
    )
}

#[allow(dead_code)]
fn readiii() -> (i64, i64, i64) {
    let mut str = String::new();
    let _ = stdin().read_line(&mut str).unwrap();
    let mut iter = str.split_whitespace();
    (
        iter.next().unwrap().parse::<i64>().unwrap(),
        iter.next().unwrap().parse::<i64>().unwrap(),
        iter.next().unwrap().parse::<i64>().unwrap(),
    )
}
#[allow(dead_code)]
fn readuu() -> (usize, usize) {
    let mut str = String::new();
    let _ = stdin().read_line(&mut str).unwrap();
    let mut iter = str.split_whitespace();
    (
        iter.next().unwrap().parse::<usize>().unwrap(),
        iter.next().unwrap().parse::<usize>().unwrap(),
    )
}

fn readcc() -> (char, char) {
    let mut str = String::new();
    let _ = stdin().read_line(&mut str).unwrap();
    let mut iter = str.split_whitespace();
    (
        iter.next().unwrap().parse::<char>().unwrap(),
        iter.next().unwrap().parse::<char>().unwrap(),
    )
}

#[allow(dead_code)]
fn readuuu() -> (usize, usize, usize) {
    let mut str = String::new();
    let _ = stdin().read_line(&mut str).unwrap();
    let mut iter = str.split_whitespace();
    (
        iter.next().unwrap().parse::<usize>().unwrap(),
        iter.next().unwrap().parse::<usize>().unwrap(),
        iter.next().unwrap().parse::<usize>().unwrap(),
    )
}

#[allow(dead_code)]
fn readuuuu() -> (usize, usize, usize, usize) {
    let mut str = String::new();
    let _ = stdin().read_line(&mut str).unwrap();
    let mut iter = str.split_whitespace();
    (
        iter.next().unwrap().parse::<usize>().unwrap(),
        iter.next().unwrap().parse::<usize>().unwrap(),
        iter.next().unwrap().parse::<usize>().unwrap(),
        iter.next().unwrap().parse::<usize>().unwrap(),
    )
}

fn readiiii() -> (i64, i64, i64, i64) {
    let mut str = String::new();
    let _ = stdin().read_line(&mut str).unwrap();
    let mut iter = str.split_whitespace();
    (
        iter.next().unwrap().parse::<i64>().unwrap(),
        iter.next().unwrap().parse::<i64>().unwrap(),
        iter.next().unwrap().parse::<i64>().unwrap(),
        iter.next().unwrap().parse::<i64>().unwrap(),
    )
}
#[derive(PartialEq, PartialOrd, Clone, Copy)]
pub struct F64Total(f64);

impl Eq for F64Total {}
impl Ord for F64Total {
    fn cmp(&self, other: &F64Total) -> Ordering {
        let F64Total(f1) = *self;
        let F64Total(f2) = *other;
        if f1.is_nan() {
            Less
        } else if f2.is_nan() {
            Greater
        } else {
            if (f1 - f2).is_sign_positive() {
                Greater
            } else {
                Less
            }
        }
    }
}
pub struct Dsu {
    n: usize,
    // root node: -1 * component size
    // otherwise: parent
    parent_or_size: Vec<i32>,
}

impl Dsu {
    // 0 <= size <= 10^8 is constrained.
    pub fn new(size: usize) -> Self {
        Self {
            n: size,
            parent_or_size: vec![-1; size],
        }
    }
    pub fn merge(&mut self, a: usize, b: usize) -> usize {
        assert!(a < self.n);
        assert!(b < self.n);
        let (mut x, mut y) = (self.leader(a), self.leader(b));
        if x == y {
            return x;
        }
        if -self.parent_or_size[x] < -self.parent_or_size[y] {
            std::mem::swap(&mut x, &mut y);
        }
        self.parent_or_size[x] += self.parent_or_size[y];
        self.parent_or_size[y] = x as i32;
        x
    }

    pub fn same(&mut self, a: usize, b: usize) -> bool {
        assert!(a < self.n);
        assert!(b < self.n);
        self.leader(a) == self.leader(b)
    }
    pub fn leader(&mut self, a: usize) -> usize {
        assert!(a < self.n);
        if self.parent_or_size[a] < 0 {
            return a;
        }
        self.parent_or_size[a] = self.leader(self.parent_or_size[a] as usize) as i32;
        self.parent_or_size[a] as usize
    }
    pub fn size(&mut self, a: usize) -> usize {
        assert!(a < self.n);
        let x = self.leader(a);
        -self.parent_or_size[x] as usize
    }
    pub fn groups(&mut self) -> Vec<Vec<usize>> {
        let mut leader_buf = vec![0; self.n];
        let mut group_size = vec![0; self.n];
        for i in 0..self.n {
            leader_buf[i] = self.leader(i);
            group_size[leader_buf[i]] += 1;
        }
        let mut result = vec![Vec::new(); self.n];
        for i in 0..self.n {
            result[i].reserve(group_size[i]);
        }
        for i in 0..self.n {
            result[leader_buf[i]].push(i);
        }
        result
            .into_iter()
            .filter(|x| !x.is_empty())
            .collect::<Vec<Vec<usize>>>()
    }
}

mod kraskal {
    use crate::Dsu;
    use crate::F64Total;
    pub struct Edge {
        pub u: usize,
        pub v: usize,
        pub cost: F64Total,
    }

    #[doc = "es: undirected edges. O(ElogV)"]
    pub fn kraskal(n: usize, ess: Vec<(usize, usize, F64Total)>) -> (Vec<Edge>, Vec<Edge>) {
        let mut used = vec![];
        let mut unused = vec![];
        let mut x = 0 as usize;
        let mut es = vec![];
        for i in 0..ess.len() {
            let mut e = Edge {
                u: ess[i].0,
                v: ess[i].1,
                cost: ess[i].2,
            };

            es.push(e);
        }
        es.sort_by_key(|x| x.cost);

        let mut uf = Dsu::new(n);

        for e in es {
            if !uf.same(e.u, e.v) {
                uf.merge(e.u, e.v);
                used.push(e);
            } else {
                unused.push(e);
            }
        }

        (used, unused)
    }
    pub fn kraskal_es(n: usize, es: Vec<Edge>) -> (Vec<Edge>, Vec<Edge>) {
        let mut used = vec![];
        let mut unused = vec![];

        let mut es = es;
        es.sort_by_key(|x| x.cost);

        let mut uf = Dsu::new(n);

        for e in es {
            if !uf.same(e.u, e.v) {
                uf.merge(e.u, e.v);
                used.push(e);
            } else {
                unused.push(e);
            }
        }

        (used, unused)
    }
}

fn solve() {
    let n: usize = read();
    let mut vp = vec![];
    for i in 0..n * (n - 1) / 2 {
        let mut s = String::new();
        std::io::stdin().read_line(&mut s).unwrap();
        let mut s = s.split_whitespace();
        let mut x: usize = s.next().unwrap().parse().unwrap();
        let mut y: usize = s.next().unwrap().parse().unwrap();
        let mut c: f64 = s.next().unwrap().parse().unwrap();
        x -= 1;
        y -= 1;
        let c = F64Total(c);

        vp.push((x, y, c));
    }
    let r = kraskal(n, vp);
    let mut res = 0.0;
    for i in 0..(r.0).len() {
        if (r.0)[i].cost.0 > res {
            res = (r.0)[i].cost.0
        }
    }

    println!("{:.0}", res);
    return;
}

fn main() {
    solve();
}

yukicoder

結果

コンパイルメッセージ

ソースコード