結果
| 問題 | No.2420 Simple Problem | 
| コンテスト | |
| ユーザー |  | 
| 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();
}
            
            
            
        