Problem:
Score : 100 points

Problem Statement

How many multiples of d are there among the integers between L and R (inclusive)?

Constraints

All values in input are integers.

1 \leq L \leq R \leq 100

1 \leq d \leq 100

Input

Input is given from Standard Input in the following format:

L R d

Output

Print the number of multiples of d among the integers between L and R (inclusive).

Sample Input 1

5 10 2

Sample Output 1

3

Among the integers between 5 and 10, there are three multiples of 2: 6, 8, and 10.

Sample Input 2

6 20 7

Sample Output 2

2

Among the integers between 6 and 20, there are two multiples of 7: 7 and 14.

Sample Input 3

1 100 1

Sample Output 3

100

Solution in Rust (1.42.0) (judge verdict: Accepted)

use std::io;
fn main() {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();
    let v: Vec<u8> = s.trim().split_whitespace().map(|x| x.parse().unwrap()).collect();
    let (l, r, d) = (v[0], v[1], v[2]);

    let cnt = (l..r+1).filter(|x| x%d == 0).collect::<Vec<u8>>().len();
    println!("{}", cnt);
}