What is a Jolly Jumper Sequence? how do implement it using c#

Question

Develop a C# Windows Form Application that allows users to do all of the following.
Read a List of patient's information from a text file (*.txt), the input text file is selected from the Open File Dialog.
Your program should accept any text file with the following format:
a. The file contains columns with Basic information about patients.
b. Columns may be separated by spaces and/or tabs.
c. The first line in the file is the column header.
d. After the header, each line represents a Patient (name, address, phone#, Bdate, gander ,wheight, height and blood type).
e. Successfully imported patients are displayed on a data grid view in a second form and added to a patient list.

1. The user will be able to display on The Grid view :
   a) Female patients.
   b) Patients with age<45 year. c) Save Over weighted patients on a text file .  Note: To find over weighted patients you have to calculate the BMI value. BMI=Weight/ (Height*Height). If BMI <18.5 >>>>> under weighted.
   18.5<=BMI<=25 >>>>>>>Normal.
   BMI>25 >>>>>>>>>>>> Over Weighted.

Answer 1

a sequence of integer where absolute difference between them is should be 1 to n-1 whereas n>0.

For example: [19 22 24 25] here difference is [3 2 1] which is equivalent to [1 2 3] and makes it "jolly jumper"..