結果
問題 | No.2420 Simple Problem |
ユーザー | haihamabossu |
提出日時 | 2023-08-12 14:17:56 |
言語 | Rust (1.83.0 + proconio) |
結果 |
AC
|
実行時間 | 155 ms / 2,000 ms |
コード長 | 2,090 bytes |
コンパイル時間 | 14,476 ms |
コンパイル使用メモリ | 395,440 KB |
実行使用メモリ | 5,248 KB |
最終ジャッジ日時 | 2024-11-19 18:27:08 |
合計ジャッジ時間 | 22,407 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 1 |
other | AC * 33 |
ソースコード
pub mod binary_search { type T = usize; pub fn binary_search(mut ok: T, mut ng: T, f: impl Fn(T) -> bool) -> T { let cont = |ok: T, ng: T| { let l = ok.min(ng); let r = ok.max(ng); l + 1 < r }; while cont(ok, ng) { let x = (ok + ng) / 2; if f(x) { ok = x; } else { ng = x; } } ok } } 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::{binary_search::binary_search, 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 = scanner.next(); for _ in 0..t { solve(&mut scanner, &mut out); } } fn solve(scanner: &mut Scanner, out: &mut std::io::BufWriter<std::io::StdoutLock>) { let a: usize = scanner.next(); let b: usize = scanner.next(); let xx = binary_search(4e9 as usize + 10, a + b, |xx| { a * b * 4 < (xx - a - b) * (xx - a - b) }); let x = binary_search(xx, 0, |x| xx <= x * x); writeln!(out, "{}", x).unwrap(); }