https://school.programmers.co.kr/learn/courses/30/lessons/120833?language=csharp
using System;
using System.Collections.Generic;
public class Solution {
public int[] solution(int[] numbers, int num1, int num2) {
List<int> list = new List<int>();
for(int i = num1; i <= num2; i++)
{
list.Add(numbers[i]);
}
int[] answer = list.ToArray();
return answer;
}
}