CODE

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

    int[] indices = new int[2];
    indices[0] = 0;
    indices[1] = 0;

    for (int i = 0; i < numbers.Length - 1; i++)
    {
      for (int j = i + 1; j < numbers.Length; j++)
      {
        int sum = numbers[i] + numbers[j];
        if (sum == target)
        {
          indices[0] = i+1;
          indices[1] = j+1;
          break;
        }
      }
    }
    return indices;
  }
}