CODE

public class Solution {
  public int[] TwoSum(int[] nums, int target) {

    int[] sum_indices = new int[2];

    for (int i = 0; i < nums.Length - 1; i++)
    {
      for (int j = i+1; j < nums.Length ; j++)
      {
        if ((nums[i] + nums[j]) == target)
        {
          sum_indices[0] = i;
          sum_indices[1] = j;
          return sum_indices;
        }
      }
    }
    int[] def = {-1,-1};
    return def;
  }
}