Problem:
Score : 200 points

Problem Statement

Print all the integers that satisfies the following in ascending order:

Among the integers between A and B (inclusive), it is either within the K smallest integers or within the K largest integers.

Constraints

1 \leq A \leq B \leq 10^9

1 \leq K \leq 100

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B K

Output

Print all the integers that satisfies the condition above in ascending order.

Sample Input 1

3 8 2

Sample Output 1

3
4
7
8

3 is the first smallest integer among the integers between 3 and 8.

4 is the second smallest integer among the integers between 3 and 8.

7 is the second largest integer among the integers between 3 and 8.

8 is the first largest integer among the integers between 3 and 8.

Sample Input 2

4 8 3

Sample Output 2

4
5
6
7
8

Sample Input 3

2 9 100

Sample Output 3

2
3
4
5
6
7
8
9

Solution in Rust (1.15.1) (judge verdict: Wrong Answer)

use std::io::*;
use std::str::*;
use std::collections::HashSet;

fn read<T: FromStr>() -> Option<T> {
    let stdin = stdin();
    let s = stdin
        .bytes()
        .map(|c| c.unwrap() as char)
        .take_while(|c| !c.is_whitespace())
        .collect::<String>();
    s.parse::<T>().ok()
}

fn main() {
    let a: usize = read().unwrap();
    let b: usize = read().unwrap();
    let k: usize = read().unwrap();
    let mut answer = HashSet::new();
    for i in 0..k {
        let x = a + i;
        let y = b - i;
        if i > ((b - a) as f64 / 2.0) as usize + 1 {
            break;
        }
        answer.insert(x);
        answer.insert(y);
    }
    let mut answer = answer.into_iter().collect::<Vec<usize>>();
    answer.sort_by(|a, b| a.cmp(b));
    for ans in answer.iter() {
        println!("{}", ans);
    }
}