結果

問題 No.2417 Div Count
ユーザー haihamabossu
提出日時 2023-08-12 13:44:16
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 11 ms / 2,000 ms
コード長 2,601 bytes
コンパイル時間 14,458 ms
コンパイル使用メモリ 383,460 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-11-19 16:03:17
合計ジャッジ時間 14,094 ms
ジャッジサーバーID
(参考情報)
judge5 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 41
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

pub mod prime_factorization {
pub fn prime_factorization(n: usize) -> std::collections::BTreeMap<usize, usize> {
let mut res = std::collections::BTreeMap::<usize, usize>::new();
if n < 2 {
return res;
}
let mut rem = n;
{
let mut i = 2;
while i * i <= rem {
while rem % i == 0 {
*res.entry(i).or_insert(0) += 1;
rem /= i;
}
i += 1;
}
}
if rem > 1 {
*res.entry(rem).or_insert(0) += 1;
}
res
}
pub fn divisors(n: usize) -> Vec<usize> {
let mut res = vec![];
let mut i = 1;
while i * i <= n {
if n % i == 0 {
res.push(i);
let j = n / i;
if i != j {
res.push(j);
}
}
i += 1;
}
res.sort();
res
}
}
pub mod scanner {
pub struct Scanner {
buf: Vec<String>,
}
impl Scanner {
pub fn new() -> Self {
Self { buf: vec![] }
}
pub fn new_from(source: &str) -> Self {
let source = String::from(source);
let buf = Self::split(source);
Self { buf }
}
pub fn next<T: std::str::FromStr>(&mut self) -> T {
loop {
if let Some(x) = self.buf.pop() {
return x.parse().ok().expect("");
}
let mut source = String::new();
std::io::stdin().read_line(&mut source).expect("");
self.buf = Self::split(source);
}
}
fn split(source: String) -> Vec<String> {
source
.split_whitespace()
.rev()
.map(String::from)
.collect::<Vec<_>>()
}
}
}
use crate::{prime_factorization::divisors, scanner::Scanner};
use std::io::Write;
fn main() {
let mut scanner = Scanner::new();
let out = std::io::stdout();
let mut out = std::io::BufWriter::new(out.lock());
let t: usize = 1;
for _ in 0..t {
solve(&mut scanner, &mut out);
}
}
fn solve(scanner: &mut Scanner, out: &mut std::io::BufWriter<std::io::StdoutLock>) {
let n: usize = scanner.next();
let k: usize = scanner.next();
let list = divisors(n - k);
let mut ans = 0usize;
for &a in list.iter() {
if a > k {
ans += 1;
}
}
writeln!(out, "{}", ans).unwrap();
}
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