結果
| 問題 |
No.1240 Or Sum of Xor Pair
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2020-10-01 17:01:47 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 289 ms / 2,000 ms |
| コード長 | 3,709 bytes |
| コンパイル時間 | 12,120 ms |
| コンパイル使用メモリ | 406,664 KB |
| 実行使用メモリ | 7,736 KB |
| 最終ジャッジ日時 | 2024-07-07 01:24:19 |
| 合計ジャッジ時間 | 22,829 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 30 |
ソースコード
#[allow(unused_imports)]
use std::cmp::*;
#[allow(unused_imports)]
use std::collections::*;
use std::io::{Write, BufWriter};
// https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
macro_rules! input {
($($r:tt)*) => {
let stdin = std::io::stdin();
let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock()));
let mut next = move || -> String{
bytes
.by_ref()
.map(|r|r.unwrap() as char)
.skip_while(|c|c.is_whitespace())
.take_while(|c|!c.is_whitespace())
.collect()
};
input_inner!{next, $($r)*}
};
}
macro_rules! input_inner {
($next:expr) => {};
($next:expr, ) => {};
($next:expr, $var:ident : $t:tt $($r:tt)*) => {
let $var = read_value!($next, $t);
input_inner!{$next $($r)*}
};
}
macro_rules! read_value {
($next:expr, [graph1; $len:expr]) => {{
let mut g = vec![vec![]; $len];
let ab = read_value!($next, [(usize1, usize1)]);
for (a, b) in ab {
g[a].push(b);
g[b].push(a);
}
g
}};
($next:expr, ( $($t:tt),* )) => {
( $(read_value!($next, $t)),* )
};
($next:expr, [ $t:tt ; $len:expr ]) => {
(0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>()
};
($next:expr, chars) => {
read_value!($next, String).chars().collect::<Vec<char>>()
};
($next:expr, usize1) => (read_value!($next, usize) - 1);
($next:expr, [ $t:tt ]) => {{
let len = read_value!($next, usize);
read_value!($next, [$t; len])
}};
($next:expr, $t:ty) => ($next().parse::<$t>().expect("Parse error"));
}
#[allow(unused)]
macro_rules! debug {
($($format:tt)*) => (write!(std::io::stderr(), $($format)*).unwrap());
}
#[allow(unused)]
macro_rules! debugln {
($($format:tt)*) => (writeln!(std::io::stderr(), $($format)*).unwrap());
}
// 解説解。xor convolution
const B: usize = 18;
fn calc(mut cnt: Vec<i64>, x: usize) -> i64 {
for i in 0..B {
for b in 0..1 << B {
if (b & 1 << i) != 0 {
continue;
}
let x = cnt[b];
let y = cnt[b | 1 << i];
cnt[b] = x + y;
cnt[b | 1 << i] = x - y;
}
}
let cnt0 = cnt[0];
for b in 0..1 << B {
cnt[b] = cnt[b] * cnt[b];
}
for i in 0..B {
for b in 0..1 << B {
if (b & 1 << i) != 0 {
continue;
}
let x = cnt[b];
let y = cnt[b | 1 << i];
cnt[b] = (x + y) / 2;
cnt[b | 1 << i] = (x - y) / 2;
}
}
let mut sum = 0;
for i in 0..x {
sum += cnt[i];
}
(sum - cnt0) / 2
}
fn solve() {
let out = std::io::stdout();
let mut out = BufWriter::new(out.lock());
macro_rules! puts {
($($format:tt)*) => (let _ = write!(out,$($format)*););
}
input! {
n: usize, x: usize,
a: [usize; n],
}
let mut cnt = vec![0i64; 1 << B];
for &a in &a {
cnt[a] += 1;
}
let all = calc(cnt.clone(), x);
let mut sum = 0;
for i in 0..B {
let mut cp = cnt.clone();
for bits in 0..1 << B {
if (bits & 1 << i) != 0 {
cp[bits] = 0;
}
}
let del = calc(cp, x);
sum += (all - del) << i;
}
puts!("{}\n", sum);
}
fn main() {
// In order to avoid potential stack overflow, spawn a new thread.
let stack_size = 104_857_600; // 100 MB
let thd = std::thread::Builder::new().stack_size(stack_size);
thd.spawn(|| solve()).unwrap().join().unwrap();
}