結果

問題 No.743 Segments on a Polygon
ユーザー hatoohatoo
提出日時 2018-10-15 16:35:14
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 70 ms / 2,000 ms
コード長 5,392 bytes
コンパイル時間 13,613 ms
コンパイル使用メモリ 389,040 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-11-14 12:41:22
合計ジャッジ時間 14,227 ms
ジャッジサーバーID
(参考情報)
judge3 / judge2
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ファイルパターン 結果
other AC * 10
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ソースコード

diff #
プレゼンテーションモードにする

#[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;
mod util {
use std::fmt::Debug;
use std::io::{stdin, stdout, BufWriter, StdoutLock};
use std::str::FromStr;
#[allow(dead_code)]
pub fn line() -> String {
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
line.trim().to_string()
}
#[allow(dead_code)]
pub fn chars() -> Vec<char> {
line().chars().collect()
}
#[allow(dead_code)]
pub fn gets<T: FromStr>() -> Vec<T>
where
<T as FromStr>::Err: Debug,
{
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
line.split_whitespace()
.map(|t| t.parse().unwrap())
.collect()
}
#[allow(dead_code)]
pub fn with_bufwriter<F: FnOnce(BufWriter<StdoutLock>) -> ()>(f: F) {
let out = stdout();
let writer = BufWriter::new(out.lock());
f(writer)
}
}
#[allow(unused_macros)]
macro_rules ! get { ( [ $ t : ty ] ) => { { let mut line : String = String :: new ( ) ; stdin ( ) . read_line ( & mut line ) . unwrap ( ) ; line .
    split_whitespace ( ) . map ( | t | t . parse ::<$ t > ( ) . unwrap ( ) ) . collect ::< Vec < _ >> ( ) } } ; ( [ $ t : ty ] ; $ n : expr ) => { (
    0 ..$ n ) . map ( | _ | get ! ( [ $ t ] ) ) . collect ::< Vec < _ >> ( ) } ; ( $ t : ty ) => { { let mut line : String = String :: new ( ) ;
    stdin ( ) . read_line ( & mut line ) . unwrap ( ) ; line . trim ( ) . parse ::<$ t > ( ) . unwrap ( ) } } ; ( $ ( $ t : ty ) ,* ) => { { let mut
    line : String = String :: new ( ) ; stdin ( ) . read_line ( & mut line ) . unwrap ( ) ; let mut iter = line . split_whitespace ( ) ; ( $ ( iter .
    next ( ) . unwrap ( ) . parse ::<$ t > ( ) . unwrap ( ) , ) * ) } } ; ( $ t : ty ; $ n : expr ) => { ( 0 ..$ n ) . map ( | _ | get ! ( $ t ) ) .
    collect ::< Vec < _ >> ( ) } ; ( $ ( $ t : ty ) ,*; $ n : expr ) => { ( 0 ..$ n ) . map ( | _ | get ! ( $ ( $ t ) ,* ) ) . collect ::< Vec < _ >>
    ( ) } ; }
#[allow(unused_macros)]
macro_rules ! debug { ( $ ( $ a : expr ) ,* ) => { eprintln ! ( concat ! ( $ ( stringify ! ( $ a ) , " = {:?}, " ) ,* ) , $ ( $ a ) ,* ) ; } }
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();
}
}
#[allow(dead_code)]
pub trait Monoid {
type T: Clone;
fn id() -> Self::T;
fn op(a: &Self::T, b: &Self::T) -> Self::T;
}
#[allow(dead_code)]
struct SUM;
impl Monoid for SUM {
type T = i64;
fn id() -> Self::T {
0
}
fn op(a: &Self::T, b: &Self::T) -> Self::T {
*a + *b
}
}
#[allow(dead_code)]
#[doc = " Segment Tree"]
pub struct SEG<M: Monoid> {
n: usize,
buf: Vec<M::T>,
}
impl<M: Monoid> SEG<M> {
#[allow(dead_code)]
pub fn new(n: usize) -> SEG<M> {
SEG {
n: n,
buf: vec![M::id().clone(); 2 * n],
}
}
#[allow(dead_code)]
pub fn update(&mut self, k: usize, a: M::T) {
let mut k = k + self.n;
self.buf[k] = a;
while k > 0 {
k >>= 1;
self.buf[k] = M::op(&self.buf[k << 1], &self.buf[(k << 1) | 1]);
}
}
#[allow(dead_code)]
pub fn add(&mut self, k: usize, a: &M::T) {
let mut k = k + self.n;
self.buf[k] = M::op(&self.buf[k], a);
while k > 0 {
k >>= 1;
self.buf[k] = M::op(&self.buf[k << 1], &self.buf[(k << 1) | 1]);
}
}
#[allow(dead_code)]
pub fn get(&self, i: usize) -> M::T {
self.query(i, i + 1)
}
#[allow(dead_code)]
pub fn query(&self, l: usize, r: usize) -> M::T {
let mut vl = M::id();
let mut vr = M::id();
let mut l = l + self.n;
let mut r = r + self.n;
while l < r {
if l & 1 == 1 {
vl = M::op(&vl, &self.buf[l]);
l += 1;
}
if r & 1 == 1 {
r -= 1;
vr = M::op(&self.buf[r], &vr);
}
l >>= 1;
r >>= 1;
}
M::op(&vl, &vr)
}
}
fn solve() {
let (n, m) = get!(usize, usize);
let mut ab = get!(usize, usize; n);
ab.sort_by_key(|&(a, b)| {
let d1 = max(a, b) - min(a, b) - 1;
let d2 = m - 2 - d1;
min(d1, d2)
});
let mut seg: SEG<SUM> = SEG::new(m);
for &(a, b) in &ab {
seg.add(a, &1);
seg.add(b, &1);
}
let mut ans = 0;
for (a, b) in ab {
seg.add(a, &(-1));
seg.add(b, &(-1));
let (a, b) = (min(a, b), max(a, b));
let d1 = max(a, b) - min(a, b) - 1;
let d2 = m - 2 - d1;
if d1 < d2 {
ans += seg.query(a, b);
} else {
ans += seg.query(b, m);
ans += seg.query(0, a);
}
}
println!("{}", ans);
}
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