❔ Just got started with leetcode after a year of learning, I need some help...

public class Solution {
    public int[] TwoSum(int[] nums, int target) {
        for(int i = 0; i <= nums.Length; i++) {
            int e = i < nums.Length ? i + 1 : i;
            var excludedNums= new int[nums.Length-e];
            Array.Copy(nums, e, excludedNums, 0, excludedNums.Length);

            foreach(int a in excludedNums) {
                int test = nums[i] + a;
                if (test == target) {
                    if (a == nums[i]) {
                        return new int[] { i, Array.IndexOf(nums, a, i+1) };
                    }
                    return new int[] { i, Array.IndexOf(nums, a) };
                };
            }
        }
        return new int[2];
    }
}