#952554 (Rust) No.2638 Initial fare

• 問題: No.2638 Initial fare
• ユーザー: Moss_Local
• 提出日時: 2024-02-19 21:34:00
• 言語: Rust (1.77.0)
• 結果: AC
• 実行時間: 120 ms / 2,000 ms
• コード長: 4,258 bytes
• コンパイル時間: 1,146 ms
• コンパイル使用メモリ: 185,284 KB
• 実行使用メモリ: 28,484 KB
• 最終ジャッジ日時: 2024-02-19 21:34:11
• 合計ジャッジ時間: 4,753 ms
• ジャッジサーバーID （参考情報）: judge16 / judge11

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	1 ms; 6,676 KB
testcase_01	AC	1 ms; 6,676 KB
testcase_02	AC	0 ms; 6,676 KB
testcase_03	AC	1 ms; 6,676 KB
testcase_04	AC	105 ms; 24,916 KB
testcase_05	AC	102 ms; 26,180 KB
testcase_06	AC	1 ms; 6,676 KB
testcase_07	AC	96 ms; 26,472 KB
testcase_08	AC	82 ms; 26,172 KB
testcase_09	AC	89 ms; 28,060 KB
testcase_10	AC	101 ms; 28,484 KB
testcase_11	AC	0 ms; 6,676 KB
testcase_12	AC	96 ms; 26,028 KB
testcase_13	AC	78 ms; 24,924 KB
testcase_14	AC	92 ms; 27,916 KB
testcase_15	AC	88 ms; 28,484 KB
testcase_16	AC	1 ms; 6,676 KB
testcase_17	AC	120 ms; 27,996 KB
testcase_18	AC	86 ms; 26,788 KB
testcase_19	AC	100 ms; 28,164 KB
testcase_20	AC	95 ms; 27,760 KB
testcase_21	AC	94 ms; 26,344 KB
testcase_22	AC	1 ms; 6,676 KB
testcase_23	AC	115 ms; 24,628 KB
testcase_24	AC	105 ms; 25,284 KB
testcase_25	AC	1 ms; 6,676 KB
testcase_26	AC	112 ms; 25,540 KB
testcase_27	AC	98 ms; 25,276 KB

コンパイルメッセージ

warning: variable does not need to be mutable
   --> Main.rs:122:9
    |
122 |     let mut vec: Vec<i64> = read_vec();
    |         ----^^^
    |         |
    |         help: remove this `mut`
    |
    = note: `#[warn(unused_mut)]` on by default

warning: variable does not need to be mutable
   --> Main.rs:128:9
    |
128 |     let mut vec: Vec<i64> = read_vec();
    |         ----^^^
    |         |
    |         help: remove this `mut`

warning: variable does not need to be mutable
   --> Main.rs:133:9
    |
133 |     let mut vec: Vec<usize> = read_vec();
    |         ----^^^
    |         |
    |         help: remove this `mut`

warning: variable does not need to be mutable
   --> Main.rs:139:9
    |
139 |     let mut vec: Vec<f64> = read_vec();
    |         ----^^^
    |         |
    |         help: remove this `mut`

warning: variable does not need to be mutable
   --> Main.rs:144:9
    |
144 |     let mut vec: Vec<char> = read_vec();
    |         ----^^^
    |         |
    |         help: remove this `mut`

warning: variable does not need to be mutable
   --> Main.rs:149:9
    |
149 |     let mut vec: Vec<usize> = read_vec();
    |         ----^^^
    |         |
    |         help: remove this `mut`

warning: variable does not need to be mutable
   --> Main.rs:154:9
    |
154 |     let mut vec: Vec<i64> = read_vec();
    |         ----^^^
    |         |
    |         help: remove this `mut`

warning: variable does not need to be mutable
   --> Main.rs:160:9
    |
160 |     let mut vec: Vec<usize> = read_vec();
    |         ----^^^
    |         |
    |         help: remove this `mut`

warning: unused variable: `i`
   --> Main.rs:175:9
    |
175 |     for i in 0..n - 1 {
    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
    |
    = note: `#[warn(unused_variables)]` on by default

warning: 9 warnings emitted

ソースコード

// -*- coding:utf-8-unix -*-
// #![feature(map_first_last)]
#![allow(dead_code)]
#![allow(unused_imports)]
#![allow(unused_macros)]
// use core::num;
use std::cmp::*;
use std::fmt::*;
use std::hash::*;
use std::iter::FromIterator;
use std::*;
use std::{cmp, collections, fmt, io, iter, ops, str};
const INF: i64 = 1223372036854775807;
const UINF: usize = INF as usize;
const LINF: i64 = 2147483647;
const INF128: i128 = 1223372036854775807000000000000;
const MOD1: i64 = 1000000007;
const MOD9: i64 = 998244353;
const MOD: i64 = MOD9;
// const MOD: i64 = MOD2;
const UMOD: usize = MOD as usize;
const M_PI: f64 = 3.14159265358979323846;

// use proconio::input;
// const MOD: i64 = INF;

use cmp::Ordering::*;
use std::collections::*;

use std::io::stdin;
use std::io::stdout;
use std::io::Write;

macro_rules! p {
    ($x:expr) => {
        //if expr
        println!("{}", $x);
    };
}

macro_rules! vp {
    // vector print separate with space
    ($x:expr) => {
        println!(
            "{}",
            $x.iter()
                .map(|x| x.to_string())
                .collect::<Vec<_>>()
                .join(" ")
        );
    };
}

macro_rules! d {
    ($x:expr) => {
        eprintln!("{:?}", $x);
    };
}
macro_rules! yn {
    ($val:expr) => {
        if $val {
            println!("Yes");
        } else {
            println!("No");
        }
    };
}

macro_rules! map{
    // declear btreemap
    ($($key:expr => $val:expr),*) => {
        {
            let mut map = ::std::collections::BTreeMap::new();
            $(
                map.insert($key, $val);
            )*
            map
        }
    };
}

macro_rules! set{
    // declear btreemap
    ($($key:expr),*) => {
        {
            let mut set = ::std::collections::BTreeSet::new();
            $(
                set.insert($key);
            )*
            set
        }
    };
}

fn main() {
    solve();
}

// 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 read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}

#[allow(dead_code)]
fn read_mat<T: std::str::FromStr>(n: u32) -> Vec<Vec<T>> {
    (0..n).map(|_| read_vec()).collect()
}

#[allow(dead_code)]
fn readii() -> (i64, i64) {
    let mut vec: Vec<i64> = read_vec();
    (vec[0], vec[1])
}

#[allow(dead_code)]
fn readiii() -> (i64, i64, i64) {
    let mut vec: Vec<i64> = read_vec();
    (vec[0], vec[1], vec[2])
}
#[allow(dead_code)]
fn readuu() -> (usize, usize) {
    let mut vec: Vec<usize> = read_vec();
    (vec[0], vec[1])
}

#[allow(dead_code)]
fn readff() -> (f64, f64) {
    let mut vec: Vec<f64> = read_vec();
    (vec[0], vec[1])
}

fn readcc() -> (char, char) {
    let mut vec: Vec<char> = read_vec();
    (vec[0], vec[1])
}

fn readuuu() -> (usize, usize, usize) {
    let mut vec: Vec<usize> = read_vec();
    (vec[0], vec[1], vec[2])
}
#[allow(dead_code)]
fn readiiii() -> (i64, i64, i64, i64) {
    let mut vec: Vec<i64> = read_vec();
    (vec[0], vec[1], vec[2], vec[3])
}

#[allow(dead_code)]
fn readuuuu() -> (usize, usize, usize, usize) {
    let mut vec: Vec<usize> = read_vec();
    (vec[0], vec[1], vec[2], vec[3])
}

fn read_imat(h: usize) -> Vec<Vec<i64>> {
    (0..h).map(|_| read_vec()).collect()
}
fn read_cmat(h: usize) -> Vec<Vec<char>> {
    (0..h).map(|_| read::<String>().chars().collect()).collect()
}

fn solve() {
    let n: usize = read();
    let mut graph = vec![vec![(0 as usize, 0 as usize); (0) as usize]; (n) as usize];
    let mut es = vec![];
    for i in 0..n - 1 {
        let (mut a, mut b) = readuu();
        a -= 1;
        b -= 1;
        graph[a].push((b, 1));
        graph[b].push((a, 1));
        es.push((a, b));
    }
    let mut res = 0;
    for i in 0..n {
        let x = graph[i].len() as i64;
        res += x;
        res += x * (x - 1);
    }
    for e in es {
        if graph[e.0].len() == 0 || graph[e.1].len() == 0 {
            continue;
        }
        res += ((graph[e.0].len() - 1) * (graph[e.1].len() - 1)) as i64 * 2;
    }
    p!(res / 2);
    return;
}