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C++ Taskbook Level 8.7

Given a folder with files and subfolders, get an array of subfolder names from this folder.

Given a folder with files and subfolders. Get the names of all files in the folders and subfolders.

Given a text file, get the second line from this file.

Given an array of numbers, calculate the total number of digits 3 in all the numbers in the array.

Write a program that will generate the following array:

{
	"1",
	"12",
	"123",
	"1234",
	"12345",
}