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 Go (1.6) (judge verdict: Accepted)

package main

import (
	. "fmt"
    "sort"
)

// func init() { Println("----------------------------------------") }

func main() {
    var a, b, k int
    Scanf("%d %d %d", &a, &b, &k)

    set := make(map[int]struct{})

    for i := 0; i < k; i++ {
        if a + i <= b {
            if _, ok := set[a + i]; !ok {
                set[a + i] = struct{}{}
            }
        }

        if b - i >= a {
            if _, ok := set[b - i]; !ok {
                set[b - i] = struct{}{}
            }
        }
    }

    res := make([]int, 0, 205)
    for num := range set {
        res = append(res, num)
    }
    sort.Sort(sort.IntSlice(res))

    for _, v := range res {
        Println(v)
    }
}