Function count_bits

338-counting-bits.rs:17–22

(n: i32)

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pub fn count_bits(n: i32) -> Vec<i32> {
    (0..n+1).map(|i|{
        let b_vec: Vec<char> = format!("{:b}", i).chars().collect();
        b_vec.iter().filter(|e|**e=='1').count() as i32
    }).collect()
}

fn main() {
    println!("{:?}", count_bits(5));