Please help C++

The data.txt text file contains a number on the first line, n, followed by n lines with three names on each line as shown below:

4 Linda Adam Jo Bob Mina Clive John Xavier Dana Emily Katie Tim 

Write a program to do the following:

• Open the file
• Read the number on the first line into variable n
• If n is 0 or negative
  • display an error message of your choice.
• If n is 1 or above do the following:
  • Read three names from the file into three variables
  • Determine the name that would be last in alphabetical order (the largest)
  • Display this name
  • Repeat this process for all remaining lines
• Close the input file.

Expected output for the above example:

Linda Mina Xavier Tim