题解 | #求int型正整数在内存中存储时1的个数#

use std::io::{self, *};
use std::str::FromStr;

fn main() {
    let stdin = io::stdin();
    for line in stdin.lock().lines() {
        println!("{}",(i32::from_str(line.unwrap().as_str()).unwrap()).count_ones());
    }
}