getline.rs

use std::io::{self, BufRead};
use std::iter;
use itertools::Itertools;

fn get_line() -> String {
    let mut buf = String::with_capacity(64);
    io::stdin().lock().read_line(&mut buf).unwrap();
    buf
}

fn read_tuple() -> (i32, i32) {
    get_line()
        .split(' ')
        .map(|s| s.parse().unwrap())
        .next_tuple()
        .unwrap()
}

fn main() {
    let n: usize = get_line().parse().unwrap();

    let f: Vec<(i32, i32)> = iter::repeat_with(read_tuple)
        .take(n)
        .collect();
}