anchor.diff:        for k in range(i + 1, len(numbers)):
            current_sum = 0
            if current_sum == target:
  -            return [i, k]
  +            return [i + 1, k + 1]
            elif current_sum > target:
               break
            else:
  
positive.code:    for i in range(0, len(numbers) - 1):
        for k in range(i + 1, len(numbers)):
           if numbers[i] + numbers[k] == target:
              return [i, k]
     return [None, None]
  ----
  
  
negative.code:       elif current_sum < target:
           left += 1
        else
           return [left + 1, right + 1]
     return [None, None]
  ----
  
  