結果

問題 No.872 All Tree Path
ユーザー akiradeveloperakiradeveloper
提出日時 2019-08-30 22:31:09
言語 Rust
(1.77.0 + proconio)
結果
AC  
実行時間 115 ms / 3,000 ms
コード長 5,147 bytes
コンパイル時間 14,495 ms
コンパイル使用メモリ 388,604 KB
実行使用メモリ 42,496 KB
最終ジャッジ日時 2024-11-22 00:50:13
合計ジャッジ時間 16,770 ms
ジャッジサーバーID
（参考情報） 		judge5 / 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 113 ms
22,784 KB
testcase_01 AC 115 ms
22,708 KB
testcase_02 AC 112 ms
22,784 KB
testcase_03 AC 57 ms
42,496 KB
testcase_04 AC 1 ms
5,248 KB
testcase_05 AC 114 ms
22,784 KB
testcase_06 AC 112 ms
22,784 KB
testcase_07 AC 105 ms
22,784 KB
testcase_08 AC 8 ms
5,248 KB
testcase_09 AC 8 ms
5,248 KB
testcase_10 AC 8 ms
5,248 KB
testcase_11 AC 7 ms
5,248 KB
testcase_12 AC 8 ms
5,248 KB
testcase_13 AC 2 ms
5,248 KB
testcase_14 AC 1 ms
5,248 KB
testcase_15 AC 1 ms
5,248 KB
testcase_16 AC 1 ms
5,248 KB
testcase_17 AC 2 ms
5,248 KB
testcase_18 AC 1 ms
5,248 KB
testcase_19 AC 1 ms
5,248 KB
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コンパイルメッセージ
warning: unused variable: `w`
   --> src/main.rs:117:18
    |
117 |         let (u,v,w) = E[i];
    |                  ^ help: if this is intentional, prefix it with an underscore: `_w`
    |
    = note: `#[warn(unused_variables)]` on by default

warning: variable `N` should have a snake case name
   --> src/main.rs:112:9
    |
112 |         N:usize,
    |         ^ help: convert the identifier to snake case: `n`
    |
    = note: `#[warn(non_snake_case)]` on by default

warning: variable `E` should have a snake case name
   --> src/main.rs:113:9
    |
113 |         E:[(usize,usize,usize);N-1],
    |         ^ help: convert the identifier to snake case: `e`

ソースコード

diff # 

#[doc = " https://github.com/hatoo/competitive-rust-snippets"]
#[allow(unused_imports)]
use std::cmp::{max, min, Ordering};
#[allow(unused_imports)]
use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, VecDeque};
#[allow(unused_imports)]
use std::io::{stdin, stdout, BufWriter, Write};
#[allow(unused_imports)]
use std::iter::FromIterator;
#[allow(unused_macros)]
macro_rules ! debug { ( $ ( $ a : expr ) ,* ) => { eprintln ! ( concat ! ( $ ( stringify ! ( $ a ) , " = {:?}, " ) ,* ) , $ ( $ a ) ,* ) ; } }
#[macro_export]
macro_rules ! input { ( source = $ s : expr , $ ( $ r : tt ) * ) => { let mut parser = Parser :: from_str ( $ s ) ; input_inner ! { parser , $ ( $ r ) * } } ; ( parser = $ parser : ident , $ ( $ r : tt ) * ) => { input_inner ! { $ parser , $ ( $ r ) * } } ; ( new_stdin_parser = $ parser : ident , $ ( $ r : tt ) * ) => { let stdin = std :: io :: stdin ( ) ; let reader = std :: io :: BufReader :: new ( stdin . lock ( ) ) ; let mut $ parser = Parser :: new ( reader ) ; input_inner ! { $ parser , $ ( $ r ) * } } ; ( $ ( $ r : tt ) * ) => { input ! { new_stdin_parser = parser , $ ( $ r ) * } } ; }
#[macro_export]
macro_rules ! input_inner { ( $ parser : ident ) => { } ; ( $ parser : ident , ) => { } ; ( $ parser : ident , $ var : ident : $ t : tt $ ( $ r : tt ) * ) => { let $ var = read_value ! ( $ parser , $ t ) ; input_inner ! { $ parser $ ( $ r ) * } } ; }
#[macro_export]
macro_rules ! read_value { ( $ parser : ident , ( $ ( $ t : tt ) ,* ) ) => { ( $ ( read_value ! ( $ parser , $ t ) ) ,* ) } ; ( $ parser : ident , [ $ t : tt ; $ len : expr ] ) => { ( 0 ..$ len ) . map ( | _ | read_value ! ( $ parser , $ t ) ) . collect ::< Vec < _ >> ( ) } ; ( $ parser : ident , chars ) => { read_value ! ( $ parser , String ) . chars ( ) . collect ::< Vec < char >> ( ) } ; ( $ parser : ident , usize1 ) => { read_value ! ( $ parser , usize ) - 1 } ; ( $ parser : ident , $ t : ty ) => { $ parser . next ::<$ t > ( ) . expect ( "Parse error" ) } ; }
use std::io;
use std::io::BufRead;
use std::str;
pub struct Parser<R> {
    reader: R,
    buf: Vec<u8>,
    pos: usize,
}
impl Parser<io::Empty> {
    pub fn from_str(s: &str) -> Parser<io::Empty> {
        Parser {
            reader: io::empty(),
            buf: s.as_bytes().to_vec(),
            pos: 0,
        }
    }
}
impl<R: BufRead> Parser<R> {
    pub fn new(reader: R) -> Parser<R> {
        Parser {
            reader: reader,
            buf: vec![],
            pos: 0,
        }
    }
    pub fn update_buf(&mut self) {
        self.buf.clear();
        self.pos = 0;
        loop {
            let (len, complete) = {
                let buf2 = self.reader.fill_buf().unwrap();
                self.buf.extend_from_slice(buf2);
                let len = buf2.len();
                if len == 0 {
                    break;
                }
                (len, buf2[len - 1] <= 0x20)
            };
            self.reader.consume(len);
            if complete {
                break;
            }
        }
    }
    pub fn next<T: str::FromStr>(&mut self) -> Result<T, T::Err> {
        loop {
            let mut begin = self.pos;
            while begin < self.buf.len() && (self.buf[begin] <= 0x20) {
                begin += 1;
            }
            let mut end = begin;
            while end < self.buf.len() && (self.buf[end] > 0x20) {
                end += 1;
            }
            if begin != self.buf.len() {
                self.pos = end;
                return str::from_utf8(&self.buf[begin..end]).unwrap().parse::<T>();
            } else {
                self.update_buf();
            }
        }
    }
}
#[allow(unused_macros)]
macro_rules ! debug { ( $ ( $ a : expr ) ,* ) => { eprintln ! ( concat ! ( $ ( stringify ! ( $ a ) , " = {:?}, " ) ,* ) , $ ( $ a ) ,* ) ; } }
#[doc = " https://github.com/hatoo/competitive-rust-snippets"]
const BIG_STACK_SIZE: bool = true;
#[allow(dead_code)]
fn main() {
    use std::thread;
    if BIG_STACK_SIZE {
        thread::Builder::new()
            .stack_size(32 * 1024 * 1024)
            .name("solve".into())
            .spawn(solve)
            .unwrap()
            .join()
            .unwrap();
    } else {
        solve();
    }
}
fn dfs(v:usize, g: &[Vec<usize>], res: &mut [usize], visited: &mut [bool]) -> usize {
    let mut sum=1;
    visited[v]=true;
    for &u in &g[v] {
        if visited[u] { continue; }
        sum += dfs(u, g, res, visited);
    }
    res[v]=sum;
    sum
}
fn solve() {
    input!{
        N:usize,
        E:[(usize,usize,usize);N-1],
    }
    let mut g = vec![vec![];N];
    for i in 0..E.len() {
        let (u,v,w) = E[i];
        g[u-1].push(v-1);
        g[v-1].push(u-1);
    }
    let mut res=vec![0;N];
    let mut visited=vec![false;N];
    dfs(0, &g, &mut res, &mut visited);

    let mut ans=0;
    for i in 0..E.len() {
        let (u,v,w) = E[i];
        let nu = res[u-1];
        let nv = res[v-1];
        let child = if nu>nv {
            v-1
        } else { u-1 };
        let lower = res[child];
        let upper = N - lower;
        ans += w * upper * lower;
    }
    println!("{}",ans*2);
}
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