結果
| 問題 |
No.1207 グラフX
|
| コンテスト | |
| ユーザー |
cotton_fn_
|
| 提出日時 | 2020-10-15 11:00:52 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 190 ms / 2,000 ms |
| コード長 | 6,709 bytes |
| コンパイル時間 | 14,453 ms |
| コンパイル使用メモリ | 378,588 KB |
| 実行使用メモリ | 39,632 KB |
| 最終ジャッジ日時 | 2024-07-20 19:44:10 |
| 合計ジャッジ時間 | 21,762 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 46 |
ソースコード
#![allow(unused_imports, unused_macros)]
use kyoproio::*;
use std::{
collections::*,
io::{self, prelude::*},
iter,
mem::{replace, swap},
};
fn main() -> io::Result<()> {
std::thread::Builder::new()
.stack_size(64 * 1024 * 1024)
.spawn(|| {
run(
KInput::new(io::stdin().lock()),
io::BufWriter::new(io::stdout().lock()),
)
})?
.join()
.unwrap();
Ok(())
}
fn run<I: Input, O: Write>(mut kin: I, mut out: O) {
macro_rules! output { ($($args:expr),+) => { write!(&mut out, $($args),+).unwrap(); }; }
macro_rules! outputln {
($($args:expr),+) => { output!($($args),+); outputln!(); };
() => { output!("\n"); if cfg!(debug_assertions) { out.flush().unwrap(); } }
}
let (n, m, x): (usize, usize, i64) = kin.input();
let mut es: Vec<(usize, usize, i64)> = kin.seq(m);
es.sort_by_key(|(_, _, z)| *z);
let mut uf = UnionFind::new(n + 1);
let mut g = vec![Vec::new(); n + 1];
for (u, v, z) in es {
if !uf.is_same(u, v) {
uf.unite(u, v);
g[u].push((v, z));
g[v].push((u, z));
}
}
X.set(x);
G.set(g);
let ans = f(1, 0).1;
outputln!("{}", ans);
}
const P: i64 = 1e9 as i64 + 7;
static X: OnceInit<i64> = OnceInit::new();
static G: OnceInit<Vec<Vec<(usize, i64)>>> = OnceInit::new();
fn f(u: usize, p: usize) -> (usize, i64) {
let mut size = 0;
let mut dist = 0;
for &(v, z) in &G[u] {
if v != p {
let (s, d) = f(v, u);
size += s;
let t = G.len() - 1 - s;
dist = (dist + d + mod_pow(*X, z, P) * s as i64 % P * t as i64) % P;
}
}
(size + 1, dist)
}
pub fn mod_pow(mut a: i64, mut b: i64, m: i64) -> i64 {
let mut y = 1;
while b > 0 {
if b & 1 == 1 {
y = y * a % m;
}
a = a * a % m;
b >>= 1;
}
y
}
pub struct UnionFind {
p: Vec<isize>,
}
impl UnionFind {
pub fn new(n: usize) -> Self {
Self { p: vec![-1; n] }
}
pub fn root(&self, mut u: usize) -> usize {
while self.p[u] >= 0 {
u = self.p[u] as usize;
}
u
}
pub fn size(&self, u: usize) -> usize {
(-self.p[self.root(u)]) as usize
}
pub fn unite(&mut self, u: usize, v: usize) -> bool {
let mut u = self.root(u);
let mut v = self.root(v);
if u == v {
return false;
}
if self.p[u] > self.p[v] {
swap(&mut u, &mut v);
}
self.p[u] += self.p[v];
self.p[v] = u as isize;
true
}
pub fn is_same(&self, u: usize, v: usize) -> bool {
self.root(u) == self.root(v)
}
}
use std::{cell::UnsafeCell, sync::Once};
pub struct OnceInit<T> {
value: UnsafeCell<Option<T>>,
once: Once,
}
unsafe impl<T> Sync for OnceInit<T> {}
impl<T> OnceInit<T> {
pub const fn new() -> Self {
Self {
value: UnsafeCell::new(None),
once: Once::new(),
}
}
pub fn set(&self, value: T) {
self.once.call_once(|| unsafe {
let v = &mut *self.value.get();
if v.is_none() {
*v = Some(value);
}
});
}
pub fn get(&self) -> Option<&T> {
unsafe { (*self.value.get()).as_ref() }
}
}
impl<T> std::ops::Deref for OnceInit<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
self.get().unwrap()
}
}
// -----------------------------------------------------------------------------
pub mod kyoproio {
use std::io::prelude::*;
pub trait Input {
fn str(&mut self) -> &str;
fn input<T: InputParse>(&mut self) -> T {
T::input(self)
}
fn iter<T: InputParse>(&mut self) -> Iter<T, Self> {
Iter(self, std::marker::PhantomData)
}
fn seq<T: InputParse, B: std::iter::FromIterator<T>>(&mut self, n: usize) -> B {
self.iter().take(n).collect()
}
}
pub struct KInput<R> {
src: R,
buf: String,
pos: usize,
}
impl<R: BufRead> KInput<R> {
pub fn new(src: R) -> Self {
Self {
src,
buf: String::with_capacity(1 << 12),
pos: 0,
}
}
}
impl<R: BufRead> Input for KInput<R> {
fn str(&mut self) -> &str {
loop {
if self.pos >= self.buf.len() {
self.pos = 0;
self.buf.clear();
if self.src.read_line(&mut self.buf).expect("io error") == 0 {
return &self.buf;
}
}
let range = self.pos
..self.buf[self.pos..]
.find(|c: char| c.is_ascii_whitespace())
.map(|i| i + self.pos)
.unwrap_or_else(|| self.buf.len());
self.pos = range.end + 1;
if range.end > range.start {
return &self.buf[range];
}
}
}
}
pub struct Iter<'a, T, I: ?Sized>(&'a mut I, std::marker::PhantomData<*const T>);
impl<'a, T: InputParse, I: Input + ?Sized> Iterator for Iter<'a, T, I> {
type Item = T;
fn next(&mut self) -> Option<T> {
Some(self.0.input())
}
}
pub trait InputParse: Sized {
fn input<I: Input + ?Sized>(src: &mut I) -> Self;
}
impl InputParse for Vec<u8> {
fn input<I: Input + ?Sized>(src: &mut I) -> Self {
src.str().as_bytes().to_owned()
}
}
macro_rules! from_str_impl {
{ $($T:ty)* } => {
$(impl InputParse for $T {
fn input<I: Input + ?Sized>(src: &mut I) -> Self {
src.str().parse::<$T>().expect("parse error")
}
})*
}
}
from_str_impl! {
String char bool f32 f64 isize i8 i16 i32 i64 i128 usize u8 u16 u32 u64 u128
}
macro_rules! tuple_impl {
($H:ident $($T:ident)*) => {
impl<$H: InputParse, $($T: InputParse),*> InputParse for ($H, $($T),*) {
fn input<I: Input + ?Sized>(src: &mut I) -> Self {
($H::input(src), $($T::input(src)),*)
}
}
tuple_impl!($($T)*);
};
() => {}
}
tuple_impl!(A B C D E F G);
#[macro_export]
macro_rules! kdbg {
($($v:expr),*) => {
if cfg!(debug_assertions) { dbg!($($v),*) } else { ($($v),*) }
}
}
}
cotton_fn_