AtCoder Beginner Contest 246 B

https://atcoder.jp/contests/abc246/tasks/abc246_b

最初からf64にすれば楽ですね。

// Get Closer
#![allow(non_snake_case)]

use itertools::Itertools;
use std::collections::HashSet;

fn read<T: std::str::FromStr>() -> T {
    let mut line = String::new();
    std::io::stdin().read_line(&mut line).ok();
    line.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>().split_whitespace()
            .map(|e| e.parse().ok().unwrap()).collect()
}

fn main() {
    let v = read_vec();
    let A: f64 = v[0];
    let B: f64 = v[1];
    let dist = (A * A + B * B).sqrt();
    println!("{} {}", A / dist, B / dist)
}